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77241056 | 1 | /* |
05d6ac1d | 2 | * Copyright(c) 2015, 2016 Intel Corporation. |
77241056 MM |
3 | * |
4 | * This file is provided under a dual BSD/GPLv2 license. When using or | |
5 | * redistributing this file, you may do so under either license. | |
6 | * | |
7 | * GPL LICENSE SUMMARY | |
8 | * | |
77241056 MM |
9 | * This program is free software; you can redistribute it and/or modify |
10 | * it under the terms of version 2 of the GNU General Public License as | |
11 | * published by the Free Software Foundation. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * BSD LICENSE | |
19 | * | |
77241056 MM |
20 | * Redistribution and use in source and binary forms, with or without |
21 | * modification, are permitted provided that the following conditions | |
22 | * are met: | |
23 | * | |
24 | * - Redistributions of source code must retain the above copyright | |
25 | * notice, this list of conditions and the following disclaimer. | |
26 | * - Redistributions in binary form must reproduce the above copyright | |
27 | * notice, this list of conditions and the following disclaimer in | |
28 | * the documentation and/or other materials provided with the | |
29 | * distribution. | |
30 | * - Neither the name of Intel Corporation nor the names of its | |
31 | * contributors may be used to endorse or promote products derived | |
32 | * from this software without specific prior written permission. | |
33 | * | |
34 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
35 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
36 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
37 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
38 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
39 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
40 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
41 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
42 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
43 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
44 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
45 | * | |
46 | */ | |
47 | ||
48 | #include <linux/io.h> | |
ec4274f1 DD |
49 | #include <rdma/rdma_vt.h> |
50 | #include <rdma/rdmavt_qp.h> | |
77241056 MM |
51 | |
52 | #include "hfi.h" | |
53 | #include "qp.h" | |
bb5df5f9 | 54 | #include "verbs_txreq.h" |
77241056 MM |
55 | #include "trace.h" |
56 | ||
57 | /* cut down ridiculously long IB macro names */ | |
b374e060 | 58 | #define OP(x) RC_OP(x) |
77241056 | 59 | |
895420dd | 60 | static u32 restart_sge(struct rvt_sge_state *ss, struct rvt_swqe *wqe, |
77241056 MM |
61 | u32 psn, u32 pmtu) |
62 | { | |
63 | u32 len; | |
64 | ||
65 | len = delta_psn(psn, wqe->psn) * pmtu; | |
66 | ss->sge = wqe->sg_list[0]; | |
67 | ss->sg_list = wqe->sg_list + 1; | |
68 | ss->num_sge = wqe->wr.num_sge; | |
69 | ss->total_len = wqe->length; | |
1198fcea | 70 | rvt_skip_sge(ss, len, false); |
77241056 MM |
71 | return wqe->length - len; |
72 | } | |
73 | ||
77241056 MM |
74 | /** |
75 | * make_rc_ack - construct a response packet (ACK, NAK, or RDMA read) | |
76 | * @dev: the device for this QP | |
77 | * @qp: a pointer to the QP | |
78 | * @ohdr: a pointer to the IB header being constructed | |
bb5df5f9 | 79 | * @ps: the xmit packet state |
77241056 MM |
80 | * |
81 | * Return 1 if constructed; otherwise, return 0. | |
82 | * Note that we are in the responder's side of the QP context. | |
83 | * Note the QP s_lock must be held. | |
84 | */ | |
895420dd | 85 | static int make_rc_ack(struct hfi1_ibdev *dev, struct rvt_qp *qp, |
261a4351 | 86 | struct ib_other_headers *ohdr, |
bb5df5f9 | 87 | struct hfi1_pkt_state *ps) |
77241056 | 88 | { |
895420dd | 89 | struct rvt_ack_entry *e; |
77241056 MM |
90 | u32 hwords; |
91 | u32 len; | |
92 | u32 bth0; | |
93 | u32 bth2; | |
94 | int middle = 0; | |
1235bef8 | 95 | u32 pmtu = qp->pmtu; |
14553ca1 | 96 | struct hfi1_qp_priv *priv = qp->priv; |
77241056 | 97 | |
68e78b3d | 98 | lockdep_assert_held(&qp->s_lock); |
77241056 | 99 | /* Don't send an ACK if we aren't supposed to. */ |
83693bd1 | 100 | if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) |
77241056 MM |
101 | goto bail; |
102 | ||
5b6cabb0 DH |
103 | if (priv->hdr_type == HFI1_PKT_TYPE_9B) |
104 | /* header size in 32-bit words LRH+BTH = (8+12)/4. */ | |
105 | hwords = 5; | |
106 | else | |
107 | /* header size in 32-bit words 16B LRH+BTH = (16+12)/4. */ | |
108 | hwords = 7; | |
77241056 MM |
109 | |
110 | switch (qp->s_ack_state) { | |
111 | case OP(RDMA_READ_RESPONSE_LAST): | |
112 | case OP(RDMA_READ_RESPONSE_ONLY): | |
113 | e = &qp->s_ack_queue[qp->s_tail_ack_queue]; | |
114 | if (e->rdma_sge.mr) { | |
895420dd | 115 | rvt_put_mr(e->rdma_sge.mr); |
77241056 MM |
116 | e->rdma_sge.mr = NULL; |
117 | } | |
118 | /* FALLTHROUGH */ | |
119 | case OP(ATOMIC_ACKNOWLEDGE): | |
120 | /* | |
121 | * We can increment the tail pointer now that the last | |
122 | * response has been sent instead of only being | |
123 | * constructed. | |
124 | */ | |
125 | if (++qp->s_tail_ack_queue > HFI1_MAX_RDMA_ATOMIC) | |
126 | qp->s_tail_ack_queue = 0; | |
127 | /* FALLTHROUGH */ | |
128 | case OP(SEND_ONLY): | |
129 | case OP(ACKNOWLEDGE): | |
130 | /* Check for no next entry in the queue. */ | |
131 | if (qp->r_head_ack_queue == qp->s_tail_ack_queue) { | |
54d10c1e | 132 | if (qp->s_flags & RVT_S_ACK_PENDING) |
77241056 MM |
133 | goto normal; |
134 | goto bail; | |
135 | } | |
136 | ||
137 | e = &qp->s_ack_queue[qp->s_tail_ack_queue]; | |
138 | if (e->opcode == OP(RDMA_READ_REQUEST)) { | |
139 | /* | |
140 | * If a RDMA read response is being resent and | |
141 | * we haven't seen the duplicate request yet, | |
142 | * then stop sending the remaining responses the | |
143 | * responder has seen until the requester re-sends it. | |
144 | */ | |
145 | len = e->rdma_sge.sge_length; | |
146 | if (len && !e->rdma_sge.mr) { | |
147 | qp->s_tail_ack_queue = qp->r_head_ack_queue; | |
148 | goto bail; | |
149 | } | |
150 | /* Copy SGE state in case we need to resend */ | |
c239a5b5 MM |
151 | ps->s_txreq->mr = e->rdma_sge.mr; |
152 | if (ps->s_txreq->mr) | |
153 | rvt_get_mr(ps->s_txreq->mr); | |
77241056 MM |
154 | qp->s_ack_rdma_sge.sge = e->rdma_sge; |
155 | qp->s_ack_rdma_sge.num_sge = 1; | |
b777f154 | 156 | ps->s_txreq->ss = &qp->s_ack_rdma_sge; |
77241056 MM |
157 | if (len > pmtu) { |
158 | len = pmtu; | |
159 | qp->s_ack_state = OP(RDMA_READ_RESPONSE_FIRST); | |
160 | } else { | |
161 | qp->s_ack_state = OP(RDMA_READ_RESPONSE_ONLY); | |
162 | e->sent = 1; | |
163 | } | |
696513e8 | 164 | ohdr->u.aeth = rvt_compute_aeth(qp); |
77241056 MM |
165 | hwords++; |
166 | qp->s_ack_rdma_psn = e->psn; | |
167 | bth2 = mask_psn(qp->s_ack_rdma_psn++); | |
168 | } else { | |
169 | /* COMPARE_SWAP or FETCH_ADD */ | |
b777f154 | 170 | ps->s_txreq->ss = NULL; |
77241056 MM |
171 | len = 0; |
172 | qp->s_ack_state = OP(ATOMIC_ACKNOWLEDGE); | |
696513e8 | 173 | ohdr->u.at.aeth = rvt_compute_aeth(qp); |
261a4351 | 174 | ib_u64_put(e->atomic_data, &ohdr->u.at.atomic_ack_eth); |
77241056 MM |
175 | hwords += sizeof(ohdr->u.at) / sizeof(u32); |
176 | bth2 = mask_psn(e->psn); | |
177 | e->sent = 1; | |
178 | } | |
179 | bth0 = qp->s_ack_state << 24; | |
180 | break; | |
181 | ||
182 | case OP(RDMA_READ_RESPONSE_FIRST): | |
183 | qp->s_ack_state = OP(RDMA_READ_RESPONSE_MIDDLE); | |
184 | /* FALLTHROUGH */ | |
185 | case OP(RDMA_READ_RESPONSE_MIDDLE): | |
b777f154 | 186 | ps->s_txreq->ss = &qp->s_ack_rdma_sge; |
c239a5b5 MM |
187 | ps->s_txreq->mr = qp->s_ack_rdma_sge.sge.mr; |
188 | if (ps->s_txreq->mr) | |
189 | rvt_get_mr(ps->s_txreq->mr); | |
77241056 MM |
190 | len = qp->s_ack_rdma_sge.sge.sge_length; |
191 | if (len > pmtu) { | |
192 | len = pmtu; | |
193 | middle = HFI1_CAP_IS_KSET(SDMA_AHG); | |
194 | } else { | |
696513e8 | 195 | ohdr->u.aeth = rvt_compute_aeth(qp); |
77241056 MM |
196 | hwords++; |
197 | qp->s_ack_state = OP(RDMA_READ_RESPONSE_LAST); | |
198 | e = &qp->s_ack_queue[qp->s_tail_ack_queue]; | |
199 | e->sent = 1; | |
200 | } | |
201 | bth0 = qp->s_ack_state << 24; | |
202 | bth2 = mask_psn(qp->s_ack_rdma_psn++); | |
203 | break; | |
204 | ||
205 | default: | |
206 | normal: | |
207 | /* | |
208 | * Send a regular ACK. | |
209 | * Set the s_ack_state so we wait until after sending | |
210 | * the ACK before setting s_ack_state to ACKNOWLEDGE | |
211 | * (see above). | |
212 | */ | |
213 | qp->s_ack_state = OP(SEND_ONLY); | |
54d10c1e | 214 | qp->s_flags &= ~RVT_S_ACK_PENDING; |
b777f154 | 215 | ps->s_txreq->ss = NULL; |
77241056 MM |
216 | if (qp->s_nak_state) |
217 | ohdr->u.aeth = | |
832666c1 | 218 | cpu_to_be32((qp->r_msn & IB_MSN_MASK) | |
77241056 | 219 | (qp->s_nak_state << |
832666c1 | 220 | IB_AETH_CREDIT_SHIFT)); |
77241056 | 221 | else |
696513e8 | 222 | ohdr->u.aeth = rvt_compute_aeth(qp); |
77241056 MM |
223 | hwords++; |
224 | len = 0; | |
225 | bth0 = OP(ACKNOWLEDGE) << 24; | |
226 | bth2 = mask_psn(qp->s_ack_psn); | |
227 | } | |
228 | qp->s_rdma_ack_cnt++; | |
229 | qp->s_hdrwords = hwords; | |
14553ca1 | 230 | ps->s_txreq->sde = priv->s_sde; |
e922ae06 | 231 | ps->s_txreq->s_cur_size = len; |
bb5df5f9 | 232 | hfi1_make_ruc_header(qp, ohdr, bth0, bth2, middle, ps); |
aa0ad411 JX |
233 | /* pbc */ |
234 | ps->s_txreq->hdr_dwords = qp->s_hdrwords + 2; | |
77241056 MM |
235 | return 1; |
236 | ||
237 | bail: | |
238 | qp->s_ack_state = OP(ACKNOWLEDGE); | |
239 | /* | |
240 | * Ensure s_rdma_ack_cnt changes are committed prior to resetting | |
54d10c1e | 241 | * RVT_S_RESP_PENDING |
77241056 MM |
242 | */ |
243 | smp_wmb(); | |
54d10c1e DD |
244 | qp->s_flags &= ~(RVT_S_RESP_PENDING |
245 | | RVT_S_ACK_PENDING | |
246 | | RVT_S_AHG_VALID); | |
77241056 MM |
247 | return 0; |
248 | } | |
249 | ||
250 | /** | |
251 | * hfi1_make_rc_req - construct a request packet (SEND, RDMA r/w, ATOMIC) | |
252 | * @qp: a pointer to the QP | |
253 | * | |
46a80d62 MM |
254 | * Assumes s_lock is held. |
255 | * | |
77241056 MM |
256 | * Return 1 if constructed; otherwise, return 0. |
257 | */ | |
bb5df5f9 | 258 | int hfi1_make_rc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps) |
77241056 | 259 | { |
4c6829c5 | 260 | struct hfi1_qp_priv *priv = qp->priv; |
77241056 | 261 | struct hfi1_ibdev *dev = to_idev(qp->ibqp.device); |
261a4351 | 262 | struct ib_other_headers *ohdr; |
895420dd DD |
263 | struct rvt_sge_state *ss; |
264 | struct rvt_swqe *wqe; | |
5b6cabb0 | 265 | u32 hwords; |
77241056 MM |
266 | u32 len; |
267 | u32 bth0 = 0; | |
268 | u32 bth2; | |
269 | u32 pmtu = qp->pmtu; | |
270 | char newreq; | |
77241056 MM |
271 | int middle = 0; |
272 | int delta; | |
273 | ||
68e78b3d | 274 | lockdep_assert_held(&qp->s_lock); |
bb5df5f9 DD |
275 | ps->s_txreq = get_txreq(ps->dev, qp); |
276 | if (IS_ERR(ps->s_txreq)) | |
277 | goto bail_no_tx; | |
278 | ||
5b6cabb0 DH |
279 | if (priv->hdr_type == HFI1_PKT_TYPE_9B) { |
280 | /* header size in 32-bit words LRH+BTH = (8+12)/4. */ | |
281 | hwords = 5; | |
282 | if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) | |
283 | ohdr = &ps->s_txreq->phdr.hdr.ibh.u.l.oth; | |
284 | else | |
285 | ohdr = &ps->s_txreq->phdr.hdr.ibh.u.oth; | |
286 | } else { | |
287 | /* header size in 32-bit words 16B LRH+BTH = (16+12)/4. */ | |
288 | hwords = 7; | |
289 | if ((rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) && | |
290 | (hfi1_check_mcast(rdma_ah_get_dlid(&qp->remote_ah_attr)))) | |
291 | ohdr = &ps->s_txreq->phdr.hdr.opah.u.l.oth; | |
292 | else | |
293 | ohdr = &ps->s_txreq->phdr.hdr.opah.u.oth; | |
294 | } | |
77241056 | 295 | |
77241056 | 296 | /* Sending responses has higher priority over sending requests. */ |
54d10c1e | 297 | if ((qp->s_flags & RVT_S_RESP_PENDING) && |
1235bef8 | 298 | make_rc_ack(dev, qp, ohdr, ps)) |
bb5df5f9 | 299 | return 1; |
77241056 | 300 | |
83693bd1 DD |
301 | if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_SEND_OK)) { |
302 | if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND)) | |
77241056 MM |
303 | goto bail; |
304 | /* We are in the error state, flush the work request. */ | |
46a80d62 | 305 | smp_read_barrier_depends(); /* see post_one_send() */ |
eb04ff09 | 306 | if (qp->s_last == READ_ONCE(qp->s_head)) |
77241056 MM |
307 | goto bail; |
308 | /* If DMAs are in progress, we can't flush immediately. */ | |
14553ca1 | 309 | if (iowait_sdma_pending(&priv->s_iowait)) { |
54d10c1e | 310 | qp->s_flags |= RVT_S_WAIT_DMA; |
77241056 MM |
311 | goto bail; |
312 | } | |
313 | clear_ahg(qp); | |
83693bd1 | 314 | wqe = rvt_get_swqe_ptr(qp, qp->s_last); |
77241056 MM |
315 | hfi1_send_complete(qp, wqe, qp->s_last != qp->s_acked ? |
316 | IB_WC_SUCCESS : IB_WC_WR_FLUSH_ERR); | |
317 | /* will get called again */ | |
bb5df5f9 | 318 | goto done_free_tx; |
77241056 MM |
319 | } |
320 | ||
54d10c1e | 321 | if (qp->s_flags & (RVT_S_WAIT_RNR | RVT_S_WAIT_ACK)) |
77241056 MM |
322 | goto bail; |
323 | ||
324 | if (cmp_psn(qp->s_psn, qp->s_sending_hpsn) <= 0) { | |
325 | if (cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) <= 0) { | |
54d10c1e | 326 | qp->s_flags |= RVT_S_WAIT_PSN; |
77241056 MM |
327 | goto bail; |
328 | } | |
329 | qp->s_sending_psn = qp->s_psn; | |
330 | qp->s_sending_hpsn = qp->s_psn - 1; | |
331 | } | |
332 | ||
333 | /* Send a request. */ | |
83693bd1 | 334 | wqe = rvt_get_swqe_ptr(qp, qp->s_cur); |
77241056 MM |
335 | switch (qp->s_state) { |
336 | default: | |
83693bd1 | 337 | if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_NEXT_SEND_OK)) |
77241056 MM |
338 | goto bail; |
339 | /* | |
340 | * Resend an old request or start a new one. | |
341 | * | |
342 | * We keep track of the current SWQE so that | |
343 | * we don't reset the "furthest progress" state | |
344 | * if we need to back up. | |
345 | */ | |
346 | newreq = 0; | |
347 | if (qp->s_cur == qp->s_tail) { | |
348 | /* Check if send work queue is empty. */ | |
eb04ff09 MM |
349 | smp_read_barrier_depends(); /* see post_one_send() */ |
350 | if (qp->s_tail == READ_ONCE(qp->s_head)) { | |
77241056 MM |
351 | clear_ahg(qp); |
352 | goto bail; | |
353 | } | |
354 | /* | |
355 | * If a fence is requested, wait for previous | |
356 | * RDMA read and atomic operations to finish. | |
357 | */ | |
358 | if ((wqe->wr.send_flags & IB_SEND_FENCE) && | |
359 | qp->s_num_rd_atomic) { | |
54d10c1e | 360 | qp->s_flags |= RVT_S_WAIT_FENCE; |
77241056 MM |
361 | goto bail; |
362 | } | |
0db3dfa0 JX |
363 | /* |
364 | * Local operations are processed immediately | |
365 | * after all prior requests have completed | |
366 | */ | |
367 | if (wqe->wr.opcode == IB_WR_REG_MR || | |
368 | wqe->wr.opcode == IB_WR_LOCAL_INV) { | |
d9b13c20 JX |
369 | int local_ops = 0; |
370 | int err = 0; | |
371 | ||
0db3dfa0 JX |
372 | if (qp->s_last != qp->s_cur) |
373 | goto bail; | |
374 | if (++qp->s_cur == qp->s_size) | |
375 | qp->s_cur = 0; | |
376 | if (++qp->s_tail == qp->s_size) | |
377 | qp->s_tail = 0; | |
d9b13c20 JX |
378 | if (!(wqe->wr.send_flags & |
379 | RVT_SEND_COMPLETION_ONLY)) { | |
0db3dfa0 JX |
380 | err = rvt_invalidate_rkey( |
381 | qp, | |
382 | wqe->wr.ex.invalidate_rkey); | |
d9b13c20 JX |
383 | local_ops = 1; |
384 | } | |
0db3dfa0 JX |
385 | hfi1_send_complete(qp, wqe, |
386 | err ? IB_WC_LOC_PROT_ERR | |
387 | : IB_WC_SUCCESS); | |
d9b13c20 JX |
388 | if (local_ops) |
389 | atomic_dec(&qp->local_ops_pending); | |
0db3dfa0 JX |
390 | qp->s_hdrwords = 0; |
391 | goto done_free_tx; | |
392 | } | |
393 | ||
77241056 | 394 | newreq = 1; |
46a80d62 | 395 | qp->s_psn = wqe->psn; |
77241056 MM |
396 | } |
397 | /* | |
398 | * Note that we have to be careful not to modify the | |
399 | * original work request since we may need to resend | |
400 | * it. | |
401 | */ | |
402 | len = wqe->length; | |
403 | ss = &qp->s_sge; | |
404 | bth2 = mask_psn(qp->s_psn); | |
405 | switch (wqe->wr.opcode) { | |
406 | case IB_WR_SEND: | |
407 | case IB_WR_SEND_WITH_IMM: | |
0db3dfa0 | 408 | case IB_WR_SEND_WITH_INV: |
77241056 | 409 | /* If no credit, return. */ |
54d10c1e | 410 | if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT) && |
696513e8 | 411 | rvt_cmp_msn(wqe->ssn, qp->s_lsn + 1) > 0) { |
54d10c1e | 412 | qp->s_flags |= RVT_S_WAIT_SSN_CREDIT; |
77241056 MM |
413 | goto bail; |
414 | } | |
77241056 | 415 | if (len > pmtu) { |
77241056 MM |
416 | qp->s_state = OP(SEND_FIRST); |
417 | len = pmtu; | |
418 | break; | |
419 | } | |
e490974e | 420 | if (wqe->wr.opcode == IB_WR_SEND) { |
77241056 | 421 | qp->s_state = OP(SEND_ONLY); |
0db3dfa0 | 422 | } else if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) { |
77241056 MM |
423 | qp->s_state = OP(SEND_ONLY_WITH_IMMEDIATE); |
424 | /* Immediate data comes after the BTH */ | |
425 | ohdr->u.imm_data = wqe->wr.ex.imm_data; | |
426 | hwords += 1; | |
0db3dfa0 JX |
427 | } else { |
428 | qp->s_state = OP(SEND_ONLY_WITH_INVALIDATE); | |
429 | /* Invalidate rkey comes after the BTH */ | |
430 | ohdr->u.ieth = cpu_to_be32( | |
431 | wqe->wr.ex.invalidate_rkey); | |
432 | hwords += 1; | |
77241056 MM |
433 | } |
434 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
435 | bth0 |= IB_BTH_SOLICITED; | |
436 | bth2 |= IB_BTH_REQ_ACK; | |
437 | if (++qp->s_cur == qp->s_size) | |
438 | qp->s_cur = 0; | |
439 | break; | |
440 | ||
441 | case IB_WR_RDMA_WRITE: | |
54d10c1e | 442 | if (newreq && !(qp->s_flags & RVT_S_UNLIMITED_CREDIT)) |
77241056 | 443 | qp->s_lsn++; |
5b0ef650 | 444 | goto no_flow_control; |
77241056 MM |
445 | case IB_WR_RDMA_WRITE_WITH_IMM: |
446 | /* If no credit, return. */ | |
54d10c1e | 447 | if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT) && |
696513e8 | 448 | rvt_cmp_msn(wqe->ssn, qp->s_lsn + 1) > 0) { |
54d10c1e | 449 | qp->s_flags |= RVT_S_WAIT_SSN_CREDIT; |
77241056 MM |
450 | goto bail; |
451 | } | |
5b0ef650 | 452 | no_flow_control: |
261a4351 MM |
453 | put_ib_reth_vaddr( |
454 | wqe->rdma_wr.remote_addr, | |
455 | &ohdr->u.rc.reth); | |
77241056 | 456 | ohdr->u.rc.reth.rkey = |
e622f2f4 | 457 | cpu_to_be32(wqe->rdma_wr.rkey); |
77241056 MM |
458 | ohdr->u.rc.reth.length = cpu_to_be32(len); |
459 | hwords += sizeof(struct ib_reth) / sizeof(u32); | |
77241056 | 460 | if (len > pmtu) { |
77241056 MM |
461 | qp->s_state = OP(RDMA_WRITE_FIRST); |
462 | len = pmtu; | |
463 | break; | |
464 | } | |
e490974e | 465 | if (wqe->wr.opcode == IB_WR_RDMA_WRITE) { |
77241056 | 466 | qp->s_state = OP(RDMA_WRITE_ONLY); |
e490974e | 467 | } else { |
77241056 MM |
468 | qp->s_state = |
469 | OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE); | |
470 | /* Immediate data comes after RETH */ | |
471 | ohdr->u.rc.imm_data = wqe->wr.ex.imm_data; | |
472 | hwords += 1; | |
473 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
474 | bth0 |= IB_BTH_SOLICITED; | |
475 | } | |
476 | bth2 |= IB_BTH_REQ_ACK; | |
477 | if (++qp->s_cur == qp->s_size) | |
478 | qp->s_cur = 0; | |
479 | break; | |
480 | ||
481 | case IB_WR_RDMA_READ: | |
482 | /* | |
483 | * Don't allow more operations to be started | |
484 | * than the QP limits allow. | |
485 | */ | |
486 | if (newreq) { | |
487 | if (qp->s_num_rd_atomic >= | |
488 | qp->s_max_rd_atomic) { | |
54d10c1e | 489 | qp->s_flags |= RVT_S_WAIT_RDMAR; |
77241056 MM |
490 | goto bail; |
491 | } | |
492 | qp->s_num_rd_atomic++; | |
54d10c1e | 493 | if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT)) |
77241056 | 494 | qp->s_lsn++; |
77241056 | 495 | } |
261a4351 MM |
496 | put_ib_reth_vaddr( |
497 | wqe->rdma_wr.remote_addr, | |
498 | &ohdr->u.rc.reth); | |
77241056 | 499 | ohdr->u.rc.reth.rkey = |
e622f2f4 | 500 | cpu_to_be32(wqe->rdma_wr.rkey); |
77241056 MM |
501 | ohdr->u.rc.reth.length = cpu_to_be32(len); |
502 | qp->s_state = OP(RDMA_READ_REQUEST); | |
503 | hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32); | |
504 | ss = NULL; | |
505 | len = 0; | |
506 | bth2 |= IB_BTH_REQ_ACK; | |
507 | if (++qp->s_cur == qp->s_size) | |
508 | qp->s_cur = 0; | |
509 | break; | |
510 | ||
511 | case IB_WR_ATOMIC_CMP_AND_SWP: | |
512 | case IB_WR_ATOMIC_FETCH_AND_ADD: | |
513 | /* | |
514 | * Don't allow more operations to be started | |
515 | * than the QP limits allow. | |
516 | */ | |
517 | if (newreq) { | |
518 | if (qp->s_num_rd_atomic >= | |
519 | qp->s_max_rd_atomic) { | |
54d10c1e | 520 | qp->s_flags |= RVT_S_WAIT_RDMAR; |
77241056 MM |
521 | goto bail; |
522 | } | |
523 | qp->s_num_rd_atomic++; | |
54d10c1e | 524 | if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT)) |
77241056 | 525 | qp->s_lsn++; |
77241056 MM |
526 | } |
527 | if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP) { | |
528 | qp->s_state = OP(COMPARE_SWAP); | |
261a4351 MM |
529 | put_ib_ateth_swap(wqe->atomic_wr.swap, |
530 | &ohdr->u.atomic_eth); | |
531 | put_ib_ateth_compare(wqe->atomic_wr.compare_add, | |
532 | &ohdr->u.atomic_eth); | |
77241056 MM |
533 | } else { |
534 | qp->s_state = OP(FETCH_ADD); | |
261a4351 MM |
535 | put_ib_ateth_swap(wqe->atomic_wr.compare_add, |
536 | &ohdr->u.atomic_eth); | |
537 | put_ib_ateth_compare(0, &ohdr->u.atomic_eth); | |
77241056 | 538 | } |
261a4351 MM |
539 | put_ib_ateth_vaddr(wqe->atomic_wr.remote_addr, |
540 | &ohdr->u.atomic_eth); | |
77241056 | 541 | ohdr->u.atomic_eth.rkey = cpu_to_be32( |
e622f2f4 | 542 | wqe->atomic_wr.rkey); |
77241056 MM |
543 | hwords += sizeof(struct ib_atomic_eth) / sizeof(u32); |
544 | ss = NULL; | |
545 | len = 0; | |
546 | bth2 |= IB_BTH_REQ_ACK; | |
547 | if (++qp->s_cur == qp->s_size) | |
548 | qp->s_cur = 0; | |
549 | break; | |
550 | ||
551 | default: | |
552 | goto bail; | |
553 | } | |
554 | qp->s_sge.sge = wqe->sg_list[0]; | |
555 | qp->s_sge.sg_list = wqe->sg_list + 1; | |
556 | qp->s_sge.num_sge = wqe->wr.num_sge; | |
557 | qp->s_sge.total_len = wqe->length; | |
558 | qp->s_len = wqe->length; | |
559 | if (newreq) { | |
560 | qp->s_tail++; | |
561 | if (qp->s_tail >= qp->s_size) | |
562 | qp->s_tail = 0; | |
563 | } | |
564 | if (wqe->wr.opcode == IB_WR_RDMA_READ) | |
565 | qp->s_psn = wqe->lpsn + 1; | |
46a80d62 | 566 | else |
77241056 | 567 | qp->s_psn++; |
77241056 MM |
568 | break; |
569 | ||
570 | case OP(RDMA_READ_RESPONSE_FIRST): | |
571 | /* | |
572 | * qp->s_state is normally set to the opcode of the | |
573 | * last packet constructed for new requests and therefore | |
574 | * is never set to RDMA read response. | |
575 | * RDMA_READ_RESPONSE_FIRST is used by the ACK processing | |
576 | * thread to indicate a SEND needs to be restarted from an | |
577 | * earlier PSN without interfering with the sending thread. | |
578 | * See restart_rc(). | |
579 | */ | |
580 | qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn, pmtu); | |
581 | /* FALLTHROUGH */ | |
582 | case OP(SEND_FIRST): | |
583 | qp->s_state = OP(SEND_MIDDLE); | |
584 | /* FALLTHROUGH */ | |
585 | case OP(SEND_MIDDLE): | |
586 | bth2 = mask_psn(qp->s_psn++); | |
77241056 MM |
587 | ss = &qp->s_sge; |
588 | len = qp->s_len; | |
589 | if (len > pmtu) { | |
590 | len = pmtu; | |
591 | middle = HFI1_CAP_IS_KSET(SDMA_AHG); | |
592 | break; | |
593 | } | |
e490974e | 594 | if (wqe->wr.opcode == IB_WR_SEND) { |
77241056 | 595 | qp->s_state = OP(SEND_LAST); |
0db3dfa0 | 596 | } else if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) { |
77241056 MM |
597 | qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE); |
598 | /* Immediate data comes after the BTH */ | |
599 | ohdr->u.imm_data = wqe->wr.ex.imm_data; | |
600 | hwords += 1; | |
0db3dfa0 JX |
601 | } else { |
602 | qp->s_state = OP(SEND_LAST_WITH_INVALIDATE); | |
603 | /* invalidate data comes after the BTH */ | |
604 | ohdr->u.ieth = cpu_to_be32(wqe->wr.ex.invalidate_rkey); | |
605 | hwords += 1; | |
77241056 MM |
606 | } |
607 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
608 | bth0 |= IB_BTH_SOLICITED; | |
609 | bth2 |= IB_BTH_REQ_ACK; | |
610 | qp->s_cur++; | |
611 | if (qp->s_cur >= qp->s_size) | |
612 | qp->s_cur = 0; | |
613 | break; | |
614 | ||
615 | case OP(RDMA_READ_RESPONSE_LAST): | |
616 | /* | |
617 | * qp->s_state is normally set to the opcode of the | |
618 | * last packet constructed for new requests and therefore | |
619 | * is never set to RDMA read response. | |
620 | * RDMA_READ_RESPONSE_LAST is used by the ACK processing | |
621 | * thread to indicate a RDMA write needs to be restarted from | |
622 | * an earlier PSN without interfering with the sending thread. | |
623 | * See restart_rc(). | |
624 | */ | |
625 | qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn, pmtu); | |
626 | /* FALLTHROUGH */ | |
627 | case OP(RDMA_WRITE_FIRST): | |
628 | qp->s_state = OP(RDMA_WRITE_MIDDLE); | |
629 | /* FALLTHROUGH */ | |
630 | case OP(RDMA_WRITE_MIDDLE): | |
631 | bth2 = mask_psn(qp->s_psn++); | |
77241056 MM |
632 | ss = &qp->s_sge; |
633 | len = qp->s_len; | |
634 | if (len > pmtu) { | |
635 | len = pmtu; | |
636 | middle = HFI1_CAP_IS_KSET(SDMA_AHG); | |
637 | break; | |
638 | } | |
e490974e | 639 | if (wqe->wr.opcode == IB_WR_RDMA_WRITE) { |
77241056 | 640 | qp->s_state = OP(RDMA_WRITE_LAST); |
e490974e | 641 | } else { |
77241056 MM |
642 | qp->s_state = OP(RDMA_WRITE_LAST_WITH_IMMEDIATE); |
643 | /* Immediate data comes after the BTH */ | |
644 | ohdr->u.imm_data = wqe->wr.ex.imm_data; | |
645 | hwords += 1; | |
646 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
647 | bth0 |= IB_BTH_SOLICITED; | |
648 | } | |
649 | bth2 |= IB_BTH_REQ_ACK; | |
650 | qp->s_cur++; | |
651 | if (qp->s_cur >= qp->s_size) | |
652 | qp->s_cur = 0; | |
653 | break; | |
654 | ||
655 | case OP(RDMA_READ_RESPONSE_MIDDLE): | |
656 | /* | |
657 | * qp->s_state is normally set to the opcode of the | |
658 | * last packet constructed for new requests and therefore | |
659 | * is never set to RDMA read response. | |
660 | * RDMA_READ_RESPONSE_MIDDLE is used by the ACK processing | |
661 | * thread to indicate a RDMA read needs to be restarted from | |
662 | * an earlier PSN without interfering with the sending thread. | |
663 | * See restart_rc(). | |
664 | */ | |
665 | len = (delta_psn(qp->s_psn, wqe->psn)) * pmtu; | |
261a4351 MM |
666 | put_ib_reth_vaddr( |
667 | wqe->rdma_wr.remote_addr + len, | |
668 | &ohdr->u.rc.reth); | |
77241056 | 669 | ohdr->u.rc.reth.rkey = |
e622f2f4 | 670 | cpu_to_be32(wqe->rdma_wr.rkey); |
77241056 MM |
671 | ohdr->u.rc.reth.length = cpu_to_be32(wqe->length - len); |
672 | qp->s_state = OP(RDMA_READ_REQUEST); | |
673 | hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32); | |
674 | bth2 = mask_psn(qp->s_psn) | IB_BTH_REQ_ACK; | |
675 | qp->s_psn = wqe->lpsn + 1; | |
676 | ss = NULL; | |
677 | len = 0; | |
678 | qp->s_cur++; | |
679 | if (qp->s_cur == qp->s_size) | |
680 | qp->s_cur = 0; | |
681 | break; | |
682 | } | |
683 | qp->s_sending_hpsn = bth2; | |
684 | delta = delta_psn(bth2, wqe->psn); | |
685 | if (delta && delta % HFI1_PSN_CREDIT == 0) | |
686 | bth2 |= IB_BTH_REQ_ACK; | |
54d10c1e DD |
687 | if (qp->s_flags & RVT_S_SEND_ONE) { |
688 | qp->s_flags &= ~RVT_S_SEND_ONE; | |
689 | qp->s_flags |= RVT_S_WAIT_ACK; | |
77241056 MM |
690 | bth2 |= IB_BTH_REQ_ACK; |
691 | } | |
692 | qp->s_len -= len; | |
693 | qp->s_hdrwords = hwords; | |
14553ca1 | 694 | ps->s_txreq->sde = priv->s_sde; |
b777f154 | 695 | ps->s_txreq->ss = ss; |
e922ae06 | 696 | ps->s_txreq->s_cur_size = len; |
77241056 MM |
697 | hfi1_make_ruc_header( |
698 | qp, | |
699 | ohdr, | |
700 | bth0 | (qp->s_state << 24), | |
701 | bth2, | |
bb5df5f9 DD |
702 | middle, |
703 | ps); | |
aa0ad411 JX |
704 | /* pbc */ |
705 | ps->s_txreq->hdr_dwords = qp->s_hdrwords + 2; | |
bb5df5f9 DD |
706 | return 1; |
707 | ||
708 | done_free_tx: | |
709 | hfi1_put_txreq(ps->s_txreq); | |
710 | ps->s_txreq = NULL; | |
46a80d62 | 711 | return 1; |
bb5df5f9 | 712 | |
77241056 | 713 | bail: |
bb5df5f9 DD |
714 | hfi1_put_txreq(ps->s_txreq); |
715 | ||
716 | bail_no_tx: | |
717 | ps->s_txreq = NULL; | |
54d10c1e | 718 | qp->s_flags &= ~RVT_S_BUSY; |
bb5df5f9 DD |
719 | qp->s_hdrwords = 0; |
720 | return 0; | |
77241056 MM |
721 | } |
722 | ||
5b6cabb0 DH |
723 | static inline void hfi1_make_bth_aeth(struct rvt_qp *qp, |
724 | struct ib_other_headers *ohdr, | |
725 | u32 bth0, u32 bth1) | |
726 | { | |
727 | if (qp->r_nak_state) | |
728 | ohdr->u.aeth = cpu_to_be32((qp->r_msn & IB_MSN_MASK) | | |
729 | (qp->r_nak_state << | |
730 | IB_AETH_CREDIT_SHIFT)); | |
731 | else | |
732 | ohdr->u.aeth = rvt_compute_aeth(qp); | |
733 | ||
734 | ohdr->bth[0] = cpu_to_be32(bth0); | |
735 | ohdr->bth[1] = cpu_to_be32(bth1 | qp->remote_qpn); | |
736 | ohdr->bth[2] = cpu_to_be32(mask_psn(qp->r_ack_psn)); | |
737 | } | |
738 | ||
739 | static inline void hfi1_queue_rc_ack(struct rvt_qp *qp, bool is_fecn) | |
740 | { | |
741 | struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); | |
742 | unsigned long flags; | |
743 | ||
744 | spin_lock_irqsave(&qp->s_lock, flags); | |
745 | if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) | |
746 | goto unlock; | |
747 | this_cpu_inc(*ibp->rvp.rc_qacks); | |
748 | qp->s_flags |= RVT_S_ACK_PENDING | RVT_S_RESP_PENDING; | |
749 | qp->s_nak_state = qp->r_nak_state; | |
750 | qp->s_ack_psn = qp->r_ack_psn; | |
751 | if (is_fecn) | |
752 | qp->s_flags |= RVT_S_ECN; | |
753 | ||
754 | /* Schedule the send tasklet. */ | |
755 | hfi1_schedule_send(qp); | |
756 | unlock: | |
757 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
758 | } | |
759 | ||
760 | static inline void hfi1_make_rc_ack_9B(struct rvt_qp *qp, | |
761 | struct hfi1_opa_header *opa_hdr, | |
762 | u8 sc5, bool is_fecn, | |
763 | u64 *pbc_flags, u32 *hwords, | |
764 | u32 *nwords) | |
765 | { | |
766 | struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); | |
767 | struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); | |
768 | struct ib_header *hdr = &opa_hdr->ibh; | |
769 | struct ib_other_headers *ohdr; | |
770 | u16 lrh0 = HFI1_LRH_BTH; | |
771 | u16 pkey; | |
772 | u32 bth0, bth1; | |
773 | ||
774 | opa_hdr->hdr_type = HFI1_PKT_TYPE_9B; | |
775 | ohdr = &hdr->u.oth; | |
776 | /* header size in 32-bit words LRH+BTH+AETH = (8+12+4)/4 */ | |
777 | *hwords = 6; | |
778 | ||
779 | if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)) { | |
780 | *hwords += hfi1_make_grh(ibp, &hdr->u.l.grh, | |
781 | rdma_ah_read_grh(&qp->remote_ah_attr), | |
782 | *hwords - 2, SIZE_OF_CRC); | |
783 | ohdr = &hdr->u.l.oth; | |
784 | lrh0 = HFI1_LRH_GRH; | |
785 | } | |
786 | /* set PBC_DC_INFO bit (aka SC[4]) in pbc_flags */ | |
787 | *pbc_flags |= ((!!(sc5 & 0x10)) << PBC_DC_INFO_SHIFT); | |
788 | ||
789 | /* read pkey_index w/o lock (its atomic) */ | |
790 | pkey = hfi1_get_pkey(ibp, qp->s_pkey_index); | |
791 | ||
792 | lrh0 |= (sc5 & IB_SC_MASK) << IB_SC_SHIFT | | |
793 | (rdma_ah_get_sl(&qp->remote_ah_attr) & IB_SL_MASK) << | |
794 | IB_SL_SHIFT; | |
795 | ||
796 | hfi1_make_ib_hdr(hdr, lrh0, *hwords + SIZE_OF_CRC, | |
797 | opa_get_lid(rdma_ah_get_dlid(&qp->remote_ah_attr), 9B), | |
798 | ppd->lid | rdma_ah_get_path_bits(&qp->remote_ah_attr)); | |
799 | ||
800 | bth0 = pkey | (OP(ACKNOWLEDGE) << 24); | |
801 | if (qp->s_mig_state == IB_MIG_MIGRATED) | |
802 | bth0 |= IB_BTH_MIG_REQ; | |
803 | bth1 = (!!is_fecn) << IB_BECN_SHIFT; | |
804 | hfi1_make_bth_aeth(qp, ohdr, bth0, bth1); | |
805 | } | |
806 | ||
807 | static inline void hfi1_make_rc_ack_16B(struct rvt_qp *qp, | |
808 | struct hfi1_opa_header *opa_hdr, | |
809 | u8 sc5, bool is_fecn, | |
810 | u64 *pbc_flags, u32 *hwords, | |
811 | u32 *nwords) | |
812 | { | |
813 | struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); | |
814 | struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); | |
815 | struct hfi1_16b_header *hdr = &opa_hdr->opah; | |
816 | struct ib_other_headers *ohdr; | |
8935780b | 817 | u32 bth0, bth1 = 0; |
5b6cabb0 DH |
818 | u16 len, pkey; |
819 | u8 becn = !!is_fecn; | |
820 | u8 l4 = OPA_16B_L4_IB_LOCAL; | |
821 | u8 extra_bytes; | |
822 | ||
823 | opa_hdr->hdr_type = HFI1_PKT_TYPE_16B; | |
824 | ohdr = &hdr->u.oth; | |
825 | /* header size in 32-bit words 16B LRH+BTH+AETH = (16+12+4)/4 */ | |
826 | *hwords = 8; | |
827 | extra_bytes = hfi1_get_16b_padding(*hwords << 2, 0); | |
828 | *nwords = SIZE_OF_CRC + ((extra_bytes + SIZE_OF_LT) >> 2); | |
829 | ||
830 | if (unlikely(rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) && | |
831 | hfi1_check_mcast(rdma_ah_get_dlid(&qp->remote_ah_attr))) { | |
832 | *hwords += hfi1_make_grh(ibp, &hdr->u.l.grh, | |
833 | rdma_ah_read_grh(&qp->remote_ah_attr), | |
834 | *hwords - 4, *nwords); | |
835 | ohdr = &hdr->u.l.oth; | |
836 | l4 = OPA_16B_L4_IB_GLOBAL; | |
837 | } | |
838 | *pbc_flags |= PBC_PACKET_BYPASS | PBC_INSERT_BYPASS_ICRC; | |
839 | ||
840 | /* read pkey_index w/o lock (its atomic) */ | |
841 | pkey = hfi1_get_pkey(ibp, qp->s_pkey_index); | |
842 | ||
843 | /* Convert dwords to flits */ | |
844 | len = (*hwords + *nwords) >> 1; | |
845 | ||
846 | hfi1_make_16b_hdr(hdr, | |
847 | ppd->lid | rdma_ah_get_path_bits(&qp->remote_ah_attr), | |
848 | opa_get_lid(rdma_ah_get_dlid(&qp->remote_ah_attr), | |
849 | 16B), | |
850 | len, pkey, becn, 0, l4, sc5); | |
851 | ||
852 | bth0 = pkey | (OP(ACKNOWLEDGE) << 24); | |
853 | bth0 |= extra_bytes << 20; | |
854 | if (qp->s_mig_state == IB_MIG_MIGRATED) | |
855 | bth1 = OPA_BTH_MIG_REQ; | |
856 | hfi1_make_bth_aeth(qp, ohdr, bth0, bth1); | |
857 | } | |
858 | ||
859 | typedef void (*hfi1_make_rc_ack)(struct rvt_qp *qp, | |
860 | struct hfi1_opa_header *opa_hdr, | |
861 | u8 sc5, bool is_fecn, | |
862 | u64 *pbc_flags, u32 *hwords, | |
863 | u32 *nwords); | |
864 | ||
865 | /* We support only two types - 9B and 16B for now */ | |
866 | static const hfi1_make_rc_ack hfi1_make_rc_ack_tbl[2] = { | |
867 | [HFI1_PKT_TYPE_9B] = &hfi1_make_rc_ack_9B, | |
868 | [HFI1_PKT_TYPE_16B] = &hfi1_make_rc_ack_16B | |
869 | }; | |
870 | ||
77241056 MM |
871 | /** |
872 | * hfi1_send_rc_ack - Construct an ACK packet and send it | |
873 | * @qp: a pointer to the QP | |
874 | * | |
875 | * This is called from hfi1_rc_rcv() and handle_receive_interrupt(). | |
876 | * Note that RDMA reads and atomics are handled in the | |
ca00c62b | 877 | * send side QP state and send engine. |
77241056 | 878 | */ |
5b6cabb0 DH |
879 | void hfi1_send_rc_ack(struct hfi1_ctxtdata *rcd, |
880 | struct rvt_qp *qp, bool is_fecn) | |
77241056 | 881 | { |
f3e862cb | 882 | struct hfi1_ibport *ibp = rcd_to_iport(rcd); |
5b6cabb0 | 883 | struct hfi1_qp_priv *priv = qp->priv; |
77241056 | 884 | struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); |
5b6cabb0 | 885 | u8 sc5 = ibp->sl_to_sc[rdma_ah_get_sl(&qp->remote_ah_attr)]; |
77241056 | 886 | u64 pbc, pbc_flags = 0; |
5b6cabb0 DH |
887 | u32 hwords = 0; |
888 | u32 nwords = 0; | |
889 | u32 plen; | |
77241056 | 890 | struct pio_buf *pbuf; |
5b6cabb0 | 891 | struct hfi1_opa_header opa_hdr; |
4fcf1de5 MM |
892 | |
893 | /* clear the defer count */ | |
688f21c0 | 894 | qp->r_adefered = 0; |
77241056 MM |
895 | |
896 | /* Don't send ACK or NAK if a RDMA read or atomic is pending. */ | |
5b6cabb0 DH |
897 | if (qp->s_flags & RVT_S_RESP_PENDING) { |
898 | hfi1_queue_rc_ack(qp, is_fecn); | |
899 | return; | |
900 | } | |
77241056 MM |
901 | |
902 | /* Ensure s_rdma_ack_cnt changes are committed */ | |
903 | smp_read_barrier_depends(); | |
5b6cabb0 DH |
904 | if (qp->s_rdma_ack_cnt) { |
905 | hfi1_queue_rc_ack(qp, is_fecn); | |
906 | return; | |
77241056 | 907 | } |
77241056 MM |
908 | |
909 | /* Don't try to send ACKs if the link isn't ACTIVE */ | |
910 | if (driver_lstate(ppd) != IB_PORT_ACTIVE) | |
911 | return; | |
912 | ||
5b6cabb0 DH |
913 | /* Make the appropriate header */ |
914 | hfi1_make_rc_ack_tbl[priv->hdr_type](qp, &opa_hdr, sc5, is_fecn, | |
915 | &pbc_flags, &hwords, &nwords); | |
77241056 | 916 | |
5b6cabb0 DH |
917 | plen = 2 /* PBC */ + hwords + nwords; |
918 | pbc = create_pbc(ppd, pbc_flags, qp->srate_mbps, | |
919 | sc_to_vlt(ppd->dd, sc5), plen); | |
920 | pbuf = sc_buffer_alloc(rcd->sc, plen, NULL, NULL); | |
77241056 MM |
921 | if (!pbuf) { |
922 | /* | |
923 | * We have no room to send at the moment. Pass | |
ca00c62b | 924 | * responsibility for sending the ACK to the send engine |
77241056 MM |
925 | * so that when enough buffer space becomes available, |
926 | * the ACK is sent ahead of other outgoing packets. | |
927 | */ | |
5b6cabb0 DH |
928 | hfi1_queue_rc_ack(qp, is_fecn); |
929 | return; | |
77241056 | 930 | } |
228d2af1 | 931 | trace_ack_output_ibhdr(dd_from_ibdev(qp->ibqp.device), |
5b6cabb0 | 932 | &opa_hdr, ib_is_sc5(sc5)); |
77241056 MM |
933 | |
934 | /* write the pbc and data */ | |
5b6cabb0 DH |
935 | ppd->dd->pio_inline_send(ppd->dd, pbuf, pbc, |
936 | (priv->hdr_type == HFI1_PKT_TYPE_9B ? | |
937 | (void *)&opa_hdr.ibh : | |
938 | (void *)&opa_hdr.opah), hwords); | |
77241056 | 939 | return; |
77241056 MM |
940 | } |
941 | ||
942 | /** | |
943 | * reset_psn - reset the QP state to send starting from PSN | |
944 | * @qp: the QP | |
945 | * @psn: the packet sequence number to restart at | |
946 | * | |
947 | * This is called from hfi1_rc_rcv() to process an incoming RC ACK | |
948 | * for the given QP. | |
949 | * Called at interrupt level with the QP s_lock held. | |
950 | */ | |
895420dd | 951 | static void reset_psn(struct rvt_qp *qp, u32 psn) |
77241056 MM |
952 | { |
953 | u32 n = qp->s_acked; | |
83693bd1 | 954 | struct rvt_swqe *wqe = rvt_get_swqe_ptr(qp, n); |
77241056 MM |
955 | u32 opcode; |
956 | ||
68e78b3d | 957 | lockdep_assert_held(&qp->s_lock); |
77241056 MM |
958 | qp->s_cur = n; |
959 | ||
960 | /* | |
961 | * If we are starting the request from the beginning, | |
962 | * let the normal send code handle initialization. | |
963 | */ | |
964 | if (cmp_psn(psn, wqe->psn) <= 0) { | |
965 | qp->s_state = OP(SEND_LAST); | |
966 | goto done; | |
967 | } | |
968 | ||
969 | /* Find the work request opcode corresponding to the given PSN. */ | |
970 | opcode = wqe->wr.opcode; | |
971 | for (;;) { | |
972 | int diff; | |
973 | ||
974 | if (++n == qp->s_size) | |
975 | n = 0; | |
976 | if (n == qp->s_tail) | |
977 | break; | |
83693bd1 | 978 | wqe = rvt_get_swqe_ptr(qp, n); |
77241056 MM |
979 | diff = cmp_psn(psn, wqe->psn); |
980 | if (diff < 0) | |
981 | break; | |
982 | qp->s_cur = n; | |
983 | /* | |
984 | * If we are starting the request from the beginning, | |
985 | * let the normal send code handle initialization. | |
986 | */ | |
987 | if (diff == 0) { | |
988 | qp->s_state = OP(SEND_LAST); | |
989 | goto done; | |
990 | } | |
991 | opcode = wqe->wr.opcode; | |
992 | } | |
993 | ||
994 | /* | |
995 | * Set the state to restart in the middle of a request. | |
996 | * Don't change the s_sge, s_cur_sge, or s_cur_size. | |
997 | * See hfi1_make_rc_req(). | |
998 | */ | |
999 | switch (opcode) { | |
1000 | case IB_WR_SEND: | |
1001 | case IB_WR_SEND_WITH_IMM: | |
1002 | qp->s_state = OP(RDMA_READ_RESPONSE_FIRST); | |
1003 | break; | |
1004 | ||
1005 | case IB_WR_RDMA_WRITE: | |
1006 | case IB_WR_RDMA_WRITE_WITH_IMM: | |
1007 | qp->s_state = OP(RDMA_READ_RESPONSE_LAST); | |
1008 | break; | |
1009 | ||
1010 | case IB_WR_RDMA_READ: | |
1011 | qp->s_state = OP(RDMA_READ_RESPONSE_MIDDLE); | |
1012 | break; | |
1013 | ||
1014 | default: | |
1015 | /* | |
1016 | * This case shouldn't happen since its only | |
1017 | * one PSN per req. | |
1018 | */ | |
1019 | qp->s_state = OP(SEND_LAST); | |
1020 | } | |
1021 | done: | |
1022 | qp->s_psn = psn; | |
1023 | /* | |
54d10c1e | 1024 | * Set RVT_S_WAIT_PSN as rc_complete() may start the timer |
ca00c62b | 1025 | * asynchronously before the send engine can get scheduled. |
77241056 MM |
1026 | * Doing it in hfi1_make_rc_req() is too late. |
1027 | */ | |
1028 | if ((cmp_psn(qp->s_psn, qp->s_sending_hpsn) <= 0) && | |
1029 | (cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) <= 0)) | |
54d10c1e DD |
1030 | qp->s_flags |= RVT_S_WAIT_PSN; |
1031 | qp->s_flags &= ~RVT_S_AHG_VALID; | |
77241056 MM |
1032 | } |
1033 | ||
1034 | /* | |
1035 | * Back up requester to resend the last un-ACKed request. | |
1036 | * The QP r_lock and s_lock should be held and interrupts disabled. | |
1037 | */ | |
56acbbfb | 1038 | void hfi1_restart_rc(struct rvt_qp *qp, u32 psn, int wait) |
77241056 | 1039 | { |
83693bd1 | 1040 | struct rvt_swqe *wqe = rvt_get_swqe_ptr(qp, qp->s_acked); |
77241056 MM |
1041 | struct hfi1_ibport *ibp; |
1042 | ||
68e78b3d MM |
1043 | lockdep_assert_held(&qp->r_lock); |
1044 | lockdep_assert_held(&qp->s_lock); | |
77241056 MM |
1045 | if (qp->s_retry == 0) { |
1046 | if (qp->s_mig_state == IB_MIG_ARMED) { | |
1047 | hfi1_migrate_qp(qp); | |
1048 | qp->s_retry = qp->s_retry_cnt; | |
1049 | } else if (qp->s_last == qp->s_acked) { | |
1050 | hfi1_send_complete(qp, wqe, IB_WC_RETRY_EXC_ERR); | |
ec4274f1 | 1051 | rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR); |
77241056 | 1052 | return; |
e490974e | 1053 | } else { /* need to handle delayed completion */ |
77241056 | 1054 | return; |
e490974e JJ |
1055 | } |
1056 | } else { | |
77241056 | 1057 | qp->s_retry--; |
e490974e | 1058 | } |
77241056 MM |
1059 | |
1060 | ibp = to_iport(qp->ibqp.device, qp->port_num); | |
1061 | if (wqe->wr.opcode == IB_WR_RDMA_READ) | |
4eb06882 | 1062 | ibp->rvp.n_rc_resends++; |
77241056 | 1063 | else |
4eb06882 | 1064 | ibp->rvp.n_rc_resends += delta_psn(qp->s_psn, psn); |
77241056 | 1065 | |
54d10c1e DD |
1066 | qp->s_flags &= ~(RVT_S_WAIT_FENCE | RVT_S_WAIT_RDMAR | |
1067 | RVT_S_WAIT_SSN_CREDIT | RVT_S_WAIT_PSN | | |
1068 | RVT_S_WAIT_ACK); | |
77241056 | 1069 | if (wait) |
54d10c1e | 1070 | qp->s_flags |= RVT_S_SEND_ONE; |
77241056 MM |
1071 | reset_psn(qp, psn); |
1072 | } | |
1073 | ||
77241056 MM |
1074 | /* |
1075 | * Set qp->s_sending_psn to the next PSN after the given one. | |
1076 | * This would be psn+1 except when RDMA reads are present. | |
1077 | */ | |
895420dd | 1078 | static void reset_sending_psn(struct rvt_qp *qp, u32 psn) |
77241056 | 1079 | { |
895420dd | 1080 | struct rvt_swqe *wqe; |
77241056 MM |
1081 | u32 n = qp->s_last; |
1082 | ||
68e78b3d | 1083 | lockdep_assert_held(&qp->s_lock); |
77241056 MM |
1084 | /* Find the work request corresponding to the given PSN. */ |
1085 | for (;;) { | |
83693bd1 | 1086 | wqe = rvt_get_swqe_ptr(qp, n); |
77241056 MM |
1087 | if (cmp_psn(psn, wqe->lpsn) <= 0) { |
1088 | if (wqe->wr.opcode == IB_WR_RDMA_READ) | |
1089 | qp->s_sending_psn = wqe->lpsn + 1; | |
1090 | else | |
1091 | qp->s_sending_psn = psn + 1; | |
1092 | break; | |
1093 | } | |
1094 | if (++n == qp->s_size) | |
1095 | n = 0; | |
1096 | if (n == qp->s_tail) | |
1097 | break; | |
1098 | } | |
1099 | } | |
1100 | ||
1101 | /* | |
1102 | * This should be called with the QP s_lock held and interrupts disabled. | |
1103 | */ | |
30e07416 | 1104 | void hfi1_rc_send_complete(struct rvt_qp *qp, struct hfi1_opa_header *opah) |
77241056 | 1105 | { |
261a4351 | 1106 | struct ib_other_headers *ohdr; |
5b6cabb0 | 1107 | struct hfi1_qp_priv *priv = qp->priv; |
895420dd | 1108 | struct rvt_swqe *wqe; |
5b6cabb0 DH |
1109 | struct ib_header *hdr = NULL; |
1110 | struct hfi1_16b_header *hdr_16b = NULL; | |
77241056 MM |
1111 | u32 opcode; |
1112 | u32 psn; | |
1113 | ||
68e78b3d | 1114 | lockdep_assert_held(&qp->s_lock); |
f9215b5e | 1115 | if (!(ib_rvt_state_ops[qp->state] & RVT_SEND_OR_FLUSH_OR_RECV_OK)) |
77241056 MM |
1116 | return; |
1117 | ||
1118 | /* Find out where the BTH is */ | |
5b6cabb0 DH |
1119 | if (priv->hdr_type == HFI1_PKT_TYPE_9B) { |
1120 | hdr = &opah->ibh; | |
1121 | if (ib_get_lnh(hdr) == HFI1_LRH_BTH) | |
1122 | ohdr = &hdr->u.oth; | |
1123 | else | |
1124 | ohdr = &hdr->u.l.oth; | |
1125 | } else { | |
1126 | u8 l4; | |
1127 | ||
1128 | hdr_16b = &opah->opah; | |
1129 | l4 = hfi1_16B_get_l4(hdr_16b); | |
1130 | if (l4 == OPA_16B_L4_IB_LOCAL) | |
1131 | ohdr = &hdr_16b->u.oth; | |
1132 | else | |
1133 | ohdr = &hdr_16b->u.l.oth; | |
1134 | } | |
77241056 | 1135 | |
cb427057 | 1136 | opcode = ib_bth_get_opcode(ohdr); |
77241056 MM |
1137 | if (opcode >= OP(RDMA_READ_RESPONSE_FIRST) && |
1138 | opcode <= OP(ATOMIC_ACKNOWLEDGE)) { | |
1139 | WARN_ON(!qp->s_rdma_ack_cnt); | |
1140 | qp->s_rdma_ack_cnt--; | |
1141 | return; | |
1142 | } | |
1143 | ||
7dafbab3 | 1144 | psn = ib_bth_get_psn(ohdr); |
77241056 MM |
1145 | reset_sending_psn(qp, psn); |
1146 | ||
1147 | /* | |
1148 | * Start timer after a packet requesting an ACK has been sent and | |
1149 | * there are still requests that haven't been acked. | |
1150 | */ | |
1151 | if ((psn & IB_BTH_REQ_ACK) && qp->s_acked != qp->s_tail && | |
1152 | !(qp->s_flags & | |
54d10c1e | 1153 | (RVT_S_TIMER | RVT_S_WAIT_RNR | RVT_S_WAIT_PSN)) && |
83693bd1 | 1154 | (ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) |
56acbbfb | 1155 | rvt_add_retry_timer(qp); |
77241056 MM |
1156 | |
1157 | while (qp->s_last != qp->s_acked) { | |
6c2ab0b8 MM |
1158 | u32 s_last; |
1159 | ||
83693bd1 | 1160 | wqe = rvt_get_swqe_ptr(qp, qp->s_last); |
77241056 MM |
1161 | if (cmp_psn(wqe->lpsn, qp->s_sending_psn) >= 0 && |
1162 | cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) <= 0) | |
1163 | break; | |
6c2ab0b8 | 1164 | s_last = qp->s_last; |
9260b354 | 1165 | trace_hfi1_qp_send_completion(qp, wqe, s_last); |
6c2ab0b8 MM |
1166 | if (++s_last >= qp->s_size) |
1167 | s_last = 0; | |
1168 | qp->s_last = s_last; | |
1169 | /* see post_send() */ | |
1170 | barrier(); | |
c64607aa | 1171 | rvt_put_swqe(wqe); |
43a474aa MM |
1172 | rvt_qp_swqe_complete(qp, |
1173 | wqe, | |
1174 | ib_hfi1_wc_opcode[wqe->wr.opcode], | |
1175 | IB_WC_SUCCESS); | |
77241056 MM |
1176 | } |
1177 | /* | |
1178 | * If we were waiting for sends to complete before re-sending, | |
1179 | * and they are now complete, restart sending. | |
1180 | */ | |
462b6b21 | 1181 | trace_hfi1_sendcomplete(qp, psn); |
54d10c1e | 1182 | if (qp->s_flags & RVT_S_WAIT_PSN && |
77241056 | 1183 | cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) > 0) { |
54d10c1e | 1184 | qp->s_flags &= ~RVT_S_WAIT_PSN; |
77241056 MM |
1185 | qp->s_sending_psn = qp->s_psn; |
1186 | qp->s_sending_hpsn = qp->s_psn - 1; | |
1187 | hfi1_schedule_send(qp); | |
1188 | } | |
1189 | } | |
1190 | ||
895420dd | 1191 | static inline void update_last_psn(struct rvt_qp *qp, u32 psn) |
77241056 MM |
1192 | { |
1193 | qp->s_last_psn = psn; | |
1194 | } | |
1195 | ||
1196 | /* | |
1197 | * Generate a SWQE completion. | |
1198 | * This is similar to hfi1_send_complete but has to check to be sure | |
1199 | * that the SGEs are not being referenced if the SWQE is being resent. | |
1200 | */ | |
895420dd DD |
1201 | static struct rvt_swqe *do_rc_completion(struct rvt_qp *qp, |
1202 | struct rvt_swqe *wqe, | |
1203 | struct hfi1_ibport *ibp) | |
77241056 | 1204 | { |
68e78b3d | 1205 | lockdep_assert_held(&qp->s_lock); |
77241056 MM |
1206 | /* |
1207 | * Don't decrement refcount and don't generate a | |
1208 | * completion if the SWQE is being resent until the send | |
1209 | * is finished. | |
1210 | */ | |
1211 | if (cmp_psn(wqe->lpsn, qp->s_sending_psn) < 0 || | |
1212 | cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) > 0) { | |
6c2ab0b8 MM |
1213 | u32 s_last; |
1214 | ||
c64607aa | 1215 | rvt_put_swqe(wqe); |
6c2ab0b8 | 1216 | s_last = qp->s_last; |
9260b354 | 1217 | trace_hfi1_qp_send_completion(qp, wqe, s_last); |
6c2ab0b8 MM |
1218 | if (++s_last >= qp->s_size) |
1219 | s_last = 0; | |
1220 | qp->s_last = s_last; | |
1221 | /* see post_send() */ | |
1222 | barrier(); | |
43a474aa MM |
1223 | rvt_qp_swqe_complete(qp, |
1224 | wqe, | |
1225 | ib_hfi1_wc_opcode[wqe->wr.opcode], | |
1226 | IB_WC_SUCCESS); | |
77241056 MM |
1227 | } else { |
1228 | struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); | |
1229 | ||
4eb06882 | 1230 | this_cpu_inc(*ibp->rvp.rc_delayed_comp); |
77241056 MM |
1231 | /* |
1232 | * If send progress not running attempt to progress | |
1233 | * SDMA queue. | |
1234 | */ | |
1235 | if (ppd->dd->flags & HFI1_HAS_SEND_DMA) { | |
1236 | struct sdma_engine *engine; | |
d8966fcd | 1237 | u8 sl = rdma_ah_get_sl(&qp->remote_ah_attr); |
77241056 MM |
1238 | u8 sc5; |
1239 | ||
1240 | /* For now use sc to find engine */ | |
d8966fcd | 1241 | sc5 = ibp->sl_to_sc[sl]; |
77241056 MM |
1242 | engine = qp_to_sdma_engine(qp, sc5); |
1243 | sdma_engine_progress_schedule(engine); | |
1244 | } | |
1245 | } | |
1246 | ||
1247 | qp->s_retry = qp->s_retry_cnt; | |
1248 | update_last_psn(qp, wqe->lpsn); | |
1249 | ||
1250 | /* | |
1251 | * If we are completing a request which is in the process of | |
1252 | * being resent, we can stop re-sending it since we know the | |
1253 | * responder has already seen it. | |
1254 | */ | |
1255 | if (qp->s_acked == qp->s_cur) { | |
1256 | if (++qp->s_cur >= qp->s_size) | |
1257 | qp->s_cur = 0; | |
1258 | qp->s_acked = qp->s_cur; | |
83693bd1 | 1259 | wqe = rvt_get_swqe_ptr(qp, qp->s_cur); |
77241056 MM |
1260 | if (qp->s_acked != qp->s_tail) { |
1261 | qp->s_state = OP(SEND_LAST); | |
1262 | qp->s_psn = wqe->psn; | |
1263 | } | |
1264 | } else { | |
1265 | if (++qp->s_acked >= qp->s_size) | |
1266 | qp->s_acked = 0; | |
1267 | if (qp->state == IB_QPS_SQD && qp->s_acked == qp->s_cur) | |
1268 | qp->s_draining = 0; | |
83693bd1 | 1269 | wqe = rvt_get_swqe_ptr(qp, qp->s_acked); |
77241056 MM |
1270 | } |
1271 | return wqe; | |
1272 | } | |
1273 | ||
1274 | /** | |
1275 | * do_rc_ack - process an incoming RC ACK | |
1276 | * @qp: the QP the ACK came in on | |
1277 | * @psn: the packet sequence number of the ACK | |
1278 | * @opcode: the opcode of the request that resulted in the ACK | |
1279 | * | |
1280 | * This is called from rc_rcv_resp() to process an incoming RC ACK | |
1281 | * for the given QP. | |
b77d713a | 1282 | * May be called at interrupt level, with the QP s_lock held. |
77241056 MM |
1283 | * Returns 1 if OK, 0 if current operation should be aborted (NAK). |
1284 | */ | |
895420dd | 1285 | static int do_rc_ack(struct rvt_qp *qp, u32 aeth, u32 psn, int opcode, |
77241056 MM |
1286 | u64 val, struct hfi1_ctxtdata *rcd) |
1287 | { | |
1288 | struct hfi1_ibport *ibp; | |
1289 | enum ib_wc_status status; | |
895420dd | 1290 | struct rvt_swqe *wqe; |
77241056 MM |
1291 | int ret = 0; |
1292 | u32 ack_psn; | |
1293 | int diff; | |
1294 | ||
68e78b3d | 1295 | lockdep_assert_held(&qp->s_lock); |
77241056 MM |
1296 | /* |
1297 | * Note that NAKs implicitly ACK outstanding SEND and RDMA write | |
1298 | * requests and implicitly NAK RDMA read and atomic requests issued | |
1299 | * before the NAK'ed request. The MSN won't include the NAK'ed | |
1300 | * request but will include an ACK'ed request(s). | |
1301 | */ | |
1302 | ack_psn = psn; | |
832666c1 | 1303 | if (aeth >> IB_AETH_NAK_SHIFT) |
77241056 | 1304 | ack_psn--; |
83693bd1 | 1305 | wqe = rvt_get_swqe_ptr(qp, qp->s_acked); |
f3e862cb | 1306 | ibp = rcd_to_iport(rcd); |
77241056 MM |
1307 | |
1308 | /* | |
1309 | * The MSN might be for a later WQE than the PSN indicates so | |
1310 | * only complete WQEs that the PSN finishes. | |
1311 | */ | |
1312 | while ((diff = delta_psn(ack_psn, wqe->lpsn)) >= 0) { | |
1313 | /* | |
1314 | * RDMA_READ_RESPONSE_ONLY is a special case since | |
1315 | * we want to generate completion events for everything | |
1316 | * before the RDMA read, copy the data, then generate | |
1317 | * the completion for the read. | |
1318 | */ | |
1319 | if (wqe->wr.opcode == IB_WR_RDMA_READ && | |
1320 | opcode == OP(RDMA_READ_RESPONSE_ONLY) && | |
1321 | diff == 0) { | |
1322 | ret = 1; | |
633d2739 | 1323 | goto bail_stop; |
77241056 MM |
1324 | } |
1325 | /* | |
1326 | * If this request is a RDMA read or atomic, and the ACK is | |
1327 | * for a later operation, this ACK NAKs the RDMA read or | |
1328 | * atomic. In other words, only a RDMA_READ_LAST or ONLY | |
1329 | * can ACK a RDMA read and likewise for atomic ops. Note | |
1330 | * that the NAK case can only happen if relaxed ordering is | |
1331 | * used and requests are sent after an RDMA read or atomic | |
1332 | * is sent but before the response is received. | |
1333 | */ | |
1334 | if ((wqe->wr.opcode == IB_WR_RDMA_READ && | |
1335 | (opcode != OP(RDMA_READ_RESPONSE_LAST) || diff != 0)) || | |
1336 | ((wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || | |
1337 | wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) && | |
1338 | (opcode != OP(ATOMIC_ACKNOWLEDGE) || diff != 0))) { | |
1339 | /* Retry this request. */ | |
54d10c1e DD |
1340 | if (!(qp->r_flags & RVT_R_RDMAR_SEQ)) { |
1341 | qp->r_flags |= RVT_R_RDMAR_SEQ; | |
56acbbfb | 1342 | hfi1_restart_rc(qp, qp->s_last_psn + 1, 0); |
77241056 | 1343 | if (list_empty(&qp->rspwait)) { |
54d10c1e | 1344 | qp->r_flags |= RVT_R_RSP_SEND; |
4d6f85c3 | 1345 | rvt_get_qp(qp); |
77241056 MM |
1346 | list_add_tail(&qp->rspwait, |
1347 | &rcd->qp_wait_list); | |
1348 | } | |
1349 | } | |
1350 | /* | |
1351 | * No need to process the ACK/NAK since we are | |
1352 | * restarting an earlier request. | |
1353 | */ | |
633d2739 | 1354 | goto bail_stop; |
77241056 MM |
1355 | } |
1356 | if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || | |
1357 | wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) { | |
1358 | u64 *vaddr = wqe->sg_list[0].vaddr; | |
1359 | *vaddr = val; | |
1360 | } | |
1361 | if (qp->s_num_rd_atomic && | |
1362 | (wqe->wr.opcode == IB_WR_RDMA_READ || | |
1363 | wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || | |
1364 | wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD)) { | |
1365 | qp->s_num_rd_atomic--; | |
1366 | /* Restart sending task if fence is complete */ | |
54d10c1e | 1367 | if ((qp->s_flags & RVT_S_WAIT_FENCE) && |
77241056 | 1368 | !qp->s_num_rd_atomic) { |
54d10c1e DD |
1369 | qp->s_flags &= ~(RVT_S_WAIT_FENCE | |
1370 | RVT_S_WAIT_ACK); | |
77241056 | 1371 | hfi1_schedule_send(qp); |
54d10c1e DD |
1372 | } else if (qp->s_flags & RVT_S_WAIT_RDMAR) { |
1373 | qp->s_flags &= ~(RVT_S_WAIT_RDMAR | | |
1374 | RVT_S_WAIT_ACK); | |
77241056 MM |
1375 | hfi1_schedule_send(qp); |
1376 | } | |
1377 | } | |
1378 | wqe = do_rc_completion(qp, wqe, ibp); | |
1379 | if (qp->s_acked == qp->s_tail) | |
1380 | break; | |
1381 | } | |
1382 | ||
832666c1 | 1383 | switch (aeth >> IB_AETH_NAK_SHIFT) { |
77241056 | 1384 | case 0: /* ACK */ |
4eb06882 | 1385 | this_cpu_inc(*ibp->rvp.rc_acks); |
77241056 MM |
1386 | if (qp->s_acked != qp->s_tail) { |
1387 | /* | |
1388 | * We are expecting more ACKs so | |
633d2739 | 1389 | * mod the retry timer. |
77241056 | 1390 | */ |
56acbbfb | 1391 | rvt_mod_retry_timer(qp); |
77241056 MM |
1392 | /* |
1393 | * We can stop re-sending the earlier packets and | |
1394 | * continue with the next packet the receiver wants. | |
1395 | */ | |
1396 | if (cmp_psn(qp->s_psn, psn) <= 0) | |
1397 | reset_psn(qp, psn + 1); | |
633d2739 MM |
1398 | } else { |
1399 | /* No more acks - kill all timers */ | |
56acbbfb | 1400 | rvt_stop_rc_timers(qp); |
633d2739 MM |
1401 | if (cmp_psn(qp->s_psn, psn) <= 0) { |
1402 | qp->s_state = OP(SEND_LAST); | |
1403 | qp->s_psn = psn + 1; | |
1404 | } | |
77241056 | 1405 | } |
54d10c1e DD |
1406 | if (qp->s_flags & RVT_S_WAIT_ACK) { |
1407 | qp->s_flags &= ~RVT_S_WAIT_ACK; | |
77241056 MM |
1408 | hfi1_schedule_send(qp); |
1409 | } | |
696513e8 | 1410 | rvt_get_credit(qp, aeth); |
77241056 MM |
1411 | qp->s_rnr_retry = qp->s_rnr_retry_cnt; |
1412 | qp->s_retry = qp->s_retry_cnt; | |
1413 | update_last_psn(qp, psn); | |
633d2739 | 1414 | return 1; |
77241056 MM |
1415 | |
1416 | case 1: /* RNR NAK */ | |
4eb06882 | 1417 | ibp->rvp.n_rnr_naks++; |
77241056 | 1418 | if (qp->s_acked == qp->s_tail) |
633d2739 | 1419 | goto bail_stop; |
54d10c1e | 1420 | if (qp->s_flags & RVT_S_WAIT_RNR) |
633d2739 | 1421 | goto bail_stop; |
77241056 MM |
1422 | if (qp->s_rnr_retry == 0) { |
1423 | status = IB_WC_RNR_RETRY_EXC_ERR; | |
1424 | goto class_b; | |
1425 | } | |
1426 | if (qp->s_rnr_retry_cnt < 7) | |
1427 | qp->s_rnr_retry--; | |
1428 | ||
1429 | /* The last valid PSN is the previous PSN. */ | |
1430 | update_last_psn(qp, psn - 1); | |
1431 | ||
4eb06882 | 1432 | ibp->rvp.n_rc_resends += delta_psn(qp->s_psn, psn); |
77241056 MM |
1433 | |
1434 | reset_psn(qp, psn); | |
1435 | ||
54d10c1e | 1436 | qp->s_flags &= ~(RVT_S_WAIT_SSN_CREDIT | RVT_S_WAIT_ACK); |
56acbbfb VSD |
1437 | rvt_stop_rc_timers(qp); |
1438 | rvt_add_rnr_timer(qp, aeth); | |
633d2739 | 1439 | return 0; |
77241056 MM |
1440 | |
1441 | case 3: /* NAK */ | |
1442 | if (qp->s_acked == qp->s_tail) | |
633d2739 | 1443 | goto bail_stop; |
77241056 MM |
1444 | /* The last valid PSN is the previous PSN. */ |
1445 | update_last_psn(qp, psn - 1); | |
832666c1 DH |
1446 | switch ((aeth >> IB_AETH_CREDIT_SHIFT) & |
1447 | IB_AETH_CREDIT_MASK) { | |
77241056 | 1448 | case 0: /* PSN sequence error */ |
4eb06882 | 1449 | ibp->rvp.n_seq_naks++; |
77241056 MM |
1450 | /* |
1451 | * Back up to the responder's expected PSN. | |
1452 | * Note that we might get a NAK in the middle of an | |
1453 | * RDMA READ response which terminates the RDMA | |
1454 | * READ. | |
1455 | */ | |
56acbbfb | 1456 | hfi1_restart_rc(qp, psn, 0); |
77241056 MM |
1457 | hfi1_schedule_send(qp); |
1458 | break; | |
1459 | ||
1460 | case 1: /* Invalid Request */ | |
1461 | status = IB_WC_REM_INV_REQ_ERR; | |
4eb06882 | 1462 | ibp->rvp.n_other_naks++; |
77241056 MM |
1463 | goto class_b; |
1464 | ||
1465 | case 2: /* Remote Access Error */ | |
1466 | status = IB_WC_REM_ACCESS_ERR; | |
4eb06882 | 1467 | ibp->rvp.n_other_naks++; |
77241056 MM |
1468 | goto class_b; |
1469 | ||
1470 | case 3: /* Remote Operation Error */ | |
1471 | status = IB_WC_REM_OP_ERR; | |
4eb06882 | 1472 | ibp->rvp.n_other_naks++; |
77241056 MM |
1473 | class_b: |
1474 | if (qp->s_last == qp->s_acked) { | |
1475 | hfi1_send_complete(qp, wqe, status); | |
ec4274f1 | 1476 | rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR); |
77241056 MM |
1477 | } |
1478 | break; | |
1479 | ||
1480 | default: | |
1481 | /* Ignore other reserved NAK error codes */ | |
1482 | goto reserved; | |
1483 | } | |
1484 | qp->s_retry = qp->s_retry_cnt; | |
1485 | qp->s_rnr_retry = qp->s_rnr_retry_cnt; | |
633d2739 | 1486 | goto bail_stop; |
77241056 MM |
1487 | |
1488 | default: /* 2: reserved */ | |
1489 | reserved: | |
1490 | /* Ignore reserved NAK codes. */ | |
633d2739 | 1491 | goto bail_stop; |
77241056 | 1492 | } |
87717f0a | 1493 | /* cannot be reached */ |
633d2739 | 1494 | bail_stop: |
56acbbfb | 1495 | rvt_stop_rc_timers(qp); |
77241056 MM |
1496 | return ret; |
1497 | } | |
1498 | ||
1499 | /* | |
1500 | * We have seen an out of sequence RDMA read middle or last packet. | |
1501 | * This ACKs SENDs and RDMA writes up to the first RDMA read or atomic SWQE. | |
1502 | */ | |
895420dd | 1503 | static void rdma_seq_err(struct rvt_qp *qp, struct hfi1_ibport *ibp, u32 psn, |
77241056 MM |
1504 | struct hfi1_ctxtdata *rcd) |
1505 | { | |
895420dd | 1506 | struct rvt_swqe *wqe; |
77241056 | 1507 | |
68e78b3d | 1508 | lockdep_assert_held(&qp->s_lock); |
77241056 | 1509 | /* Remove QP from retry timer */ |
56acbbfb | 1510 | rvt_stop_rc_timers(qp); |
77241056 | 1511 | |
83693bd1 | 1512 | wqe = rvt_get_swqe_ptr(qp, qp->s_acked); |
77241056 MM |
1513 | |
1514 | while (cmp_psn(psn, wqe->lpsn) > 0) { | |
1515 | if (wqe->wr.opcode == IB_WR_RDMA_READ || | |
1516 | wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || | |
1517 | wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) | |
1518 | break; | |
1519 | wqe = do_rc_completion(qp, wqe, ibp); | |
1520 | } | |
1521 | ||
4eb06882 | 1522 | ibp->rvp.n_rdma_seq++; |
54d10c1e | 1523 | qp->r_flags |= RVT_R_RDMAR_SEQ; |
56acbbfb | 1524 | hfi1_restart_rc(qp, qp->s_last_psn + 1, 0); |
77241056 | 1525 | if (list_empty(&qp->rspwait)) { |
54d10c1e | 1526 | qp->r_flags |= RVT_R_RSP_SEND; |
4d6f85c3 | 1527 | rvt_get_qp(qp); |
77241056 MM |
1528 | list_add_tail(&qp->rspwait, &rcd->qp_wait_list); |
1529 | } | |
1530 | } | |
1531 | ||
1532 | /** | |
1533 | * rc_rcv_resp - process an incoming RC response packet | |
5b6cabb0 | 1534 | * @packet: data packet information |
77241056 MM |
1535 | * |
1536 | * This is called from hfi1_rc_rcv() to process an incoming RC response | |
1537 | * packet for the given QP. | |
1538 | * Called at interrupt level. | |
1539 | */ | |
5b6cabb0 | 1540 | static void rc_rcv_resp(struct hfi1_packet *packet) |
77241056 | 1541 | { |
5b6cabb0 DH |
1542 | struct hfi1_ctxtdata *rcd = packet->rcd; |
1543 | void *data = packet->payload; | |
1544 | u32 tlen = packet->tlen; | |
1545 | struct rvt_qp *qp = packet->qp; | |
1546 | struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); | |
1547 | struct ib_other_headers *ohdr = packet->ohdr; | |
895420dd | 1548 | struct rvt_swqe *wqe; |
77241056 MM |
1549 | enum ib_wc_status status; |
1550 | unsigned long flags; | |
1551 | int diff; | |
77241056 | 1552 | u64 val; |
5b6cabb0 DH |
1553 | u32 aeth; |
1554 | u32 psn = ib_bth_get_psn(packet->ohdr); | |
1555 | u32 pmtu = qp->pmtu; | |
1556 | u16 hdrsize = packet->hlen; | |
1557 | u8 opcode = packet->opcode; | |
1558 | u8 pad = packet->pad; | |
1559 | u8 extra_bytes = pad + packet->extra_byte + (SIZE_OF_CRC << 2); | |
77241056 MM |
1560 | |
1561 | spin_lock_irqsave(&qp->s_lock, flags); | |
462b6b21 | 1562 | trace_hfi1_ack(qp, psn); |
83525b61 | 1563 | |
77241056 | 1564 | /* Ignore invalid responses. */ |
46a80d62 | 1565 | smp_read_barrier_depends(); /* see post_one_send */ |
eb04ff09 | 1566 | if (cmp_psn(psn, READ_ONCE(qp->s_next_psn)) >= 0) |
77241056 MM |
1567 | goto ack_done; |
1568 | ||
1569 | /* Ignore duplicate responses. */ | |
1570 | diff = cmp_psn(psn, qp->s_last_psn); | |
1571 | if (unlikely(diff <= 0)) { | |
1572 | /* Update credits for "ghost" ACKs */ | |
1573 | if (diff == 0 && opcode == OP(ACKNOWLEDGE)) { | |
1574 | aeth = be32_to_cpu(ohdr->u.aeth); | |
832666c1 | 1575 | if ((aeth >> IB_AETH_NAK_SHIFT) == 0) |
696513e8 | 1576 | rvt_get_credit(qp, aeth); |
77241056 MM |
1577 | } |
1578 | goto ack_done; | |
1579 | } | |
1580 | ||
1581 | /* | |
1582 | * Skip everything other than the PSN we expect, if we are waiting | |
1583 | * for a reply to a restarted RDMA read or atomic op. | |
1584 | */ | |
54d10c1e | 1585 | if (qp->r_flags & RVT_R_RDMAR_SEQ) { |
77241056 MM |
1586 | if (cmp_psn(psn, qp->s_last_psn + 1) != 0) |
1587 | goto ack_done; | |
54d10c1e | 1588 | qp->r_flags &= ~RVT_R_RDMAR_SEQ; |
77241056 MM |
1589 | } |
1590 | ||
1591 | if (unlikely(qp->s_acked == qp->s_tail)) | |
1592 | goto ack_done; | |
83693bd1 | 1593 | wqe = rvt_get_swqe_ptr(qp, qp->s_acked); |
77241056 MM |
1594 | status = IB_WC_SUCCESS; |
1595 | ||
1596 | switch (opcode) { | |
1597 | case OP(ACKNOWLEDGE): | |
1598 | case OP(ATOMIC_ACKNOWLEDGE): | |
1599 | case OP(RDMA_READ_RESPONSE_FIRST): | |
1600 | aeth = be32_to_cpu(ohdr->u.aeth); | |
261a4351 MM |
1601 | if (opcode == OP(ATOMIC_ACKNOWLEDGE)) |
1602 | val = ib_u64_get(&ohdr->u.at.atomic_ack_eth); | |
1603 | else | |
77241056 MM |
1604 | val = 0; |
1605 | if (!do_rc_ack(qp, aeth, psn, opcode, val, rcd) || | |
1606 | opcode != OP(RDMA_READ_RESPONSE_FIRST)) | |
1607 | goto ack_done; | |
83693bd1 | 1608 | wqe = rvt_get_swqe_ptr(qp, qp->s_acked); |
77241056 MM |
1609 | if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) |
1610 | goto ack_op_err; | |
1611 | /* | |
1612 | * If this is a response to a resent RDMA read, we | |
1613 | * have to be careful to copy the data to the right | |
1614 | * location. | |
1615 | */ | |
1616 | qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge, | |
1617 | wqe, psn, pmtu); | |
1618 | goto read_middle; | |
1619 | ||
1620 | case OP(RDMA_READ_RESPONSE_MIDDLE): | |
1621 | /* no AETH, no ACK */ | |
1622 | if (unlikely(cmp_psn(psn, qp->s_last_psn + 1))) | |
1623 | goto ack_seq_err; | |
1624 | if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) | |
1625 | goto ack_op_err; | |
1626 | read_middle: | |
5b6cabb0 | 1627 | if (unlikely(tlen != (hdrsize + pmtu + extra_bytes))) |
77241056 MM |
1628 | goto ack_len_err; |
1629 | if (unlikely(pmtu >= qp->s_rdma_read_len)) | |
1630 | goto ack_len_err; | |
1631 | ||
1632 | /* | |
1633 | * We got a response so update the timeout. | |
1634 | * 4.096 usec. * (1 << qp->timeout) | |
1635 | */ | |
56acbbfb | 1636 | rvt_mod_retry_timer(qp); |
54d10c1e DD |
1637 | if (qp->s_flags & RVT_S_WAIT_ACK) { |
1638 | qp->s_flags &= ~RVT_S_WAIT_ACK; | |
77241056 MM |
1639 | hfi1_schedule_send(qp); |
1640 | } | |
1641 | ||
1642 | if (opcode == OP(RDMA_READ_RESPONSE_MIDDLE)) | |
1643 | qp->s_retry = qp->s_retry_cnt; | |
1644 | ||
1645 | /* | |
1646 | * Update the RDMA receive state but do the copy w/o | |
1647 | * holding the locks and blocking interrupts. | |
1648 | */ | |
1649 | qp->s_rdma_read_len -= pmtu; | |
1650 | update_last_psn(qp, psn); | |
1651 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
0128fcea | 1652 | hfi1_copy_sge(&qp->s_rdma_read_sge, data, pmtu, false, false); |
77241056 MM |
1653 | goto bail; |
1654 | ||
1655 | case OP(RDMA_READ_RESPONSE_ONLY): | |
1656 | aeth = be32_to_cpu(ohdr->u.aeth); | |
1657 | if (!do_rc_ack(qp, aeth, psn, opcode, 0, rcd)) | |
1658 | goto ack_done; | |
77241056 MM |
1659 | /* |
1660 | * Check that the data size is >= 0 && <= pmtu. | |
1661 | * Remember to account for ICRC (4). | |
1662 | */ | |
5b6cabb0 | 1663 | if (unlikely(tlen < (hdrsize + extra_bytes))) |
77241056 MM |
1664 | goto ack_len_err; |
1665 | /* | |
1666 | * If this is a response to a resent RDMA read, we | |
1667 | * have to be careful to copy the data to the right | |
1668 | * location. | |
1669 | */ | |
83693bd1 | 1670 | wqe = rvt_get_swqe_ptr(qp, qp->s_acked); |
77241056 MM |
1671 | qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge, |
1672 | wqe, psn, pmtu); | |
1673 | goto read_last; | |
1674 | ||
1675 | case OP(RDMA_READ_RESPONSE_LAST): | |
1676 | /* ACKs READ req. */ | |
1677 | if (unlikely(cmp_psn(psn, qp->s_last_psn + 1))) | |
1678 | goto ack_seq_err; | |
1679 | if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) | |
1680 | goto ack_op_err; | |
77241056 MM |
1681 | /* |
1682 | * Check that the data size is >= 1 && <= pmtu. | |
1683 | * Remember to account for ICRC (4). | |
1684 | */ | |
5b6cabb0 | 1685 | if (unlikely(tlen <= (hdrsize + extra_bytes))) |
77241056 MM |
1686 | goto ack_len_err; |
1687 | read_last: | |
5b6cabb0 | 1688 | tlen -= hdrsize + extra_bytes; |
77241056 MM |
1689 | if (unlikely(tlen != qp->s_rdma_read_len)) |
1690 | goto ack_len_err; | |
1691 | aeth = be32_to_cpu(ohdr->u.aeth); | |
0128fcea | 1692 | hfi1_copy_sge(&qp->s_rdma_read_sge, data, tlen, false, false); |
77241056 | 1693 | WARN_ON(qp->s_rdma_read_sge.num_sge); |
50e5dcbe | 1694 | (void)do_rc_ack(qp, aeth, psn, |
77241056 MM |
1695 | OP(RDMA_READ_RESPONSE_LAST), 0, rcd); |
1696 | goto ack_done; | |
1697 | } | |
1698 | ||
1699 | ack_op_err: | |
1700 | status = IB_WC_LOC_QP_OP_ERR; | |
1701 | goto ack_err; | |
1702 | ||
1703 | ack_seq_err: | |
1704 | rdma_seq_err(qp, ibp, psn, rcd); | |
1705 | goto ack_done; | |
1706 | ||
1707 | ack_len_err: | |
1708 | status = IB_WC_LOC_LEN_ERR; | |
1709 | ack_err: | |
1710 | if (qp->s_last == qp->s_acked) { | |
1711 | hfi1_send_complete(qp, wqe, status); | |
ec4274f1 | 1712 | rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR); |
77241056 MM |
1713 | } |
1714 | ack_done: | |
1715 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
1716 | bail: | |
1717 | return; | |
1718 | } | |
1719 | ||
2fd36865 | 1720 | static inline void rc_defered_ack(struct hfi1_ctxtdata *rcd, |
895420dd | 1721 | struct rvt_qp *qp) |
2fd36865 MM |
1722 | { |
1723 | if (list_empty(&qp->rspwait)) { | |
54d10c1e | 1724 | qp->r_flags |= RVT_R_RSP_NAK; |
4d6f85c3 | 1725 | rvt_get_qp(qp); |
2fd36865 MM |
1726 | list_add_tail(&qp->rspwait, &rcd->qp_wait_list); |
1727 | } | |
1728 | } | |
1729 | ||
895420dd | 1730 | static inline void rc_cancel_ack(struct rvt_qp *qp) |
7c091e5c | 1731 | { |
688f21c0 | 1732 | qp->r_adefered = 0; |
7c091e5c MM |
1733 | if (list_empty(&qp->rspwait)) |
1734 | return; | |
1735 | list_del_init(&qp->rspwait); | |
54d10c1e | 1736 | qp->r_flags &= ~RVT_R_RSP_NAK; |
4d6f85c3 | 1737 | rvt_put_qp(qp); |
7c091e5c MM |
1738 | } |
1739 | ||
77241056 MM |
1740 | /** |
1741 | * rc_rcv_error - process an incoming duplicate or error RC packet | |
1742 | * @ohdr: the other headers for this packet | |
1743 | * @data: the packet data | |
1744 | * @qp: the QP for this packet | |
1745 | * @opcode: the opcode for this packet | |
1746 | * @psn: the packet sequence number for this packet | |
1747 | * @diff: the difference between the PSN and the expected PSN | |
1748 | * | |
1749 | * This is called from hfi1_rc_rcv() to process an unexpected | |
1750 | * incoming RC packet for the given QP. | |
1751 | * Called at interrupt level. | |
1752 | * Return 1 if no more processing is needed; otherwise return 0 to | |
1753 | * schedule a response to be sent. | |
1754 | */ | |
261a4351 | 1755 | static noinline int rc_rcv_error(struct ib_other_headers *ohdr, void *data, |
17fb4f29 JJ |
1756 | struct rvt_qp *qp, u32 opcode, u32 psn, |
1757 | int diff, struct hfi1_ctxtdata *rcd) | |
77241056 | 1758 | { |
f3e862cb | 1759 | struct hfi1_ibport *ibp = rcd_to_iport(rcd); |
895420dd | 1760 | struct rvt_ack_entry *e; |
77241056 MM |
1761 | unsigned long flags; |
1762 | u8 i, prev; | |
1763 | int old_req; | |
1764 | ||
462b6b21 | 1765 | trace_hfi1_rcv_error(qp, psn); |
77241056 MM |
1766 | if (diff > 0) { |
1767 | /* | |
1768 | * Packet sequence error. | |
1769 | * A NAK will ACK earlier sends and RDMA writes. | |
1770 | * Don't queue the NAK if we already sent one. | |
1771 | */ | |
1772 | if (!qp->r_nak_state) { | |
4eb06882 | 1773 | ibp->rvp.n_rc_seqnak++; |
77241056 MM |
1774 | qp->r_nak_state = IB_NAK_PSN_ERROR; |
1775 | /* Use the expected PSN. */ | |
1776 | qp->r_ack_psn = qp->r_psn; | |
1777 | /* | |
1778 | * Wait to send the sequence NAK until all packets | |
1779 | * in the receive queue have been processed. | |
1780 | * Otherwise, we end up propagating congestion. | |
1781 | */ | |
2fd36865 | 1782 | rc_defered_ack(rcd, qp); |
77241056 MM |
1783 | } |
1784 | goto done; | |
1785 | } | |
1786 | ||
1787 | /* | |
1788 | * Handle a duplicate request. Don't re-execute SEND, RDMA | |
1789 | * write or atomic op. Don't NAK errors, just silently drop | |
1790 | * the duplicate request. Note that r_sge, r_len, and | |
1791 | * r_rcv_len may be in use so don't modify them. | |
1792 | * | |
1793 | * We are supposed to ACK the earliest duplicate PSN but we | |
1794 | * can coalesce an outstanding duplicate ACK. We have to | |
1795 | * send the earliest so that RDMA reads can be restarted at | |
1796 | * the requester's expected PSN. | |
1797 | * | |
1798 | * First, find where this duplicate PSN falls within the | |
1799 | * ACKs previously sent. | |
1800 | * old_req is true if there is an older response that is scheduled | |
1801 | * to be sent before sending this one. | |
1802 | */ | |
1803 | e = NULL; | |
1804 | old_req = 1; | |
4eb06882 | 1805 | ibp->rvp.n_rc_dupreq++; |
77241056 MM |
1806 | |
1807 | spin_lock_irqsave(&qp->s_lock, flags); | |
1808 | ||
1809 | for (i = qp->r_head_ack_queue; ; i = prev) { | |
1810 | if (i == qp->s_tail_ack_queue) | |
1811 | old_req = 0; | |
1812 | if (i) | |
1813 | prev = i - 1; | |
1814 | else | |
1815 | prev = HFI1_MAX_RDMA_ATOMIC; | |
1816 | if (prev == qp->r_head_ack_queue) { | |
1817 | e = NULL; | |
1818 | break; | |
1819 | } | |
1820 | e = &qp->s_ack_queue[prev]; | |
1821 | if (!e->opcode) { | |
1822 | e = NULL; | |
1823 | break; | |
1824 | } | |
1825 | if (cmp_psn(psn, e->psn) >= 0) { | |
1826 | if (prev == qp->s_tail_ack_queue && | |
1827 | cmp_psn(psn, e->lpsn) <= 0) | |
1828 | old_req = 0; | |
1829 | break; | |
1830 | } | |
1831 | } | |
1832 | switch (opcode) { | |
1833 | case OP(RDMA_READ_REQUEST): { | |
1834 | struct ib_reth *reth; | |
1835 | u32 offset; | |
1836 | u32 len; | |
1837 | ||
1838 | /* | |
1839 | * If we didn't find the RDMA read request in the ack queue, | |
1840 | * we can ignore this request. | |
1841 | */ | |
1842 | if (!e || e->opcode != OP(RDMA_READ_REQUEST)) | |
1843 | goto unlock_done; | |
1844 | /* RETH comes after BTH */ | |
1845 | reth = &ohdr->u.rc.reth; | |
1846 | /* | |
1847 | * Address range must be a subset of the original | |
1848 | * request and start on pmtu boundaries. | |
1849 | * We reuse the old ack_queue slot since the requester | |
1850 | * should not back up and request an earlier PSN for the | |
1851 | * same request. | |
1852 | */ | |
1853 | offset = delta_psn(psn, e->psn) * qp->pmtu; | |
1854 | len = be32_to_cpu(reth->length); | |
1855 | if (unlikely(offset + len != e->rdma_sge.sge_length)) | |
1856 | goto unlock_done; | |
1857 | if (e->rdma_sge.mr) { | |
895420dd | 1858 | rvt_put_mr(e->rdma_sge.mr); |
77241056 MM |
1859 | e->rdma_sge.mr = NULL; |
1860 | } | |
1861 | if (len != 0) { | |
1862 | u32 rkey = be32_to_cpu(reth->rkey); | |
261a4351 | 1863 | u64 vaddr = get_ib_reth_vaddr(reth); |
77241056 MM |
1864 | int ok; |
1865 | ||
895420dd DD |
1866 | ok = rvt_rkey_ok(qp, &e->rdma_sge, len, vaddr, rkey, |
1867 | IB_ACCESS_REMOTE_READ); | |
77241056 MM |
1868 | if (unlikely(!ok)) |
1869 | goto unlock_done; | |
1870 | } else { | |
1871 | e->rdma_sge.vaddr = NULL; | |
1872 | e->rdma_sge.length = 0; | |
1873 | e->rdma_sge.sge_length = 0; | |
1874 | } | |
1875 | e->psn = psn; | |
1876 | if (old_req) | |
1877 | goto unlock_done; | |
1878 | qp->s_tail_ack_queue = prev; | |
1879 | break; | |
1880 | } | |
1881 | ||
1882 | case OP(COMPARE_SWAP): | |
1883 | case OP(FETCH_ADD): { | |
1884 | /* | |
1885 | * If we didn't find the atomic request in the ack queue | |
ca00c62b | 1886 | * or the send engine is already backed up to send an |
77241056 MM |
1887 | * earlier entry, we can ignore this request. |
1888 | */ | |
50e5dcbe | 1889 | if (!e || e->opcode != (u8)opcode || old_req) |
77241056 MM |
1890 | goto unlock_done; |
1891 | qp->s_tail_ack_queue = prev; | |
1892 | break; | |
1893 | } | |
1894 | ||
1895 | default: | |
1896 | /* | |
1897 | * Ignore this operation if it doesn't request an ACK | |
1898 | * or an earlier RDMA read or atomic is going to be resent. | |
1899 | */ | |
1900 | if (!(psn & IB_BTH_REQ_ACK) || old_req) | |
1901 | goto unlock_done; | |
1902 | /* | |
1903 | * Resend the most recent ACK if this request is | |
1904 | * after all the previous RDMA reads and atomics. | |
1905 | */ | |
1906 | if (i == qp->r_head_ack_queue) { | |
1907 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
1908 | qp->r_nak_state = 0; | |
1909 | qp->r_ack_psn = qp->r_psn - 1; | |
1910 | goto send_ack; | |
1911 | } | |
1912 | ||
1913 | /* | |
1914 | * Resend the RDMA read or atomic op which | |
1915 | * ACKs this duplicate request. | |
1916 | */ | |
1917 | qp->s_tail_ack_queue = i; | |
1918 | break; | |
1919 | } | |
1920 | qp->s_ack_state = OP(ACKNOWLEDGE); | |
54d10c1e | 1921 | qp->s_flags |= RVT_S_RESP_PENDING; |
77241056 MM |
1922 | qp->r_nak_state = 0; |
1923 | hfi1_schedule_send(qp); | |
1924 | ||
1925 | unlock_done: | |
1926 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
1927 | done: | |
1928 | return 1; | |
1929 | ||
1930 | send_ack: | |
1931 | return 0; | |
1932 | } | |
1933 | ||
895420dd | 1934 | static inline void update_ack_queue(struct rvt_qp *qp, unsigned n) |
77241056 MM |
1935 | { |
1936 | unsigned next; | |
1937 | ||
1938 | next = n + 1; | |
1939 | if (next > HFI1_MAX_RDMA_ATOMIC) | |
1940 | next = 0; | |
1941 | qp->s_tail_ack_queue = next; | |
1942 | qp->s_ack_state = OP(ACKNOWLEDGE); | |
1943 | } | |
1944 | ||
1945 | static void log_cca_event(struct hfi1_pportdata *ppd, u8 sl, u32 rlid, | |
1946 | u32 lqpn, u32 rqpn, u8 svc_type) | |
1947 | { | |
1948 | struct opa_hfi1_cong_log_event_internal *cc_event; | |
b77d713a | 1949 | unsigned long flags; |
77241056 MM |
1950 | |
1951 | if (sl >= OPA_MAX_SLS) | |
1952 | return; | |
1953 | ||
b77d713a | 1954 | spin_lock_irqsave(&ppd->cc_log_lock, flags); |
77241056 | 1955 | |
8638b77f | 1956 | ppd->threshold_cong_event_map[sl / 8] |= 1 << (sl % 8); |
77241056 MM |
1957 | ppd->threshold_event_counter++; |
1958 | ||
1959 | cc_event = &ppd->cc_events[ppd->cc_log_idx++]; | |
1960 | if (ppd->cc_log_idx == OPA_CONG_LOG_ELEMS) | |
1961 | ppd->cc_log_idx = 0; | |
ec4274f1 DD |
1962 | cc_event->lqpn = lqpn & RVT_QPN_MASK; |
1963 | cc_event->rqpn = rqpn & RVT_QPN_MASK; | |
77241056 MM |
1964 | cc_event->sl = sl; |
1965 | cc_event->svc_type = svc_type; | |
1966 | cc_event->rlid = rlid; | |
1967 | /* keep timestamp in units of 1.024 usec */ | |
d61ea075 | 1968 | cc_event->timestamp = ktime_get_ns() / 1024; |
77241056 | 1969 | |
b77d713a | 1970 | spin_unlock_irqrestore(&ppd->cc_log_lock, flags); |
77241056 MM |
1971 | } |
1972 | ||
5b6cabb0 | 1973 | void process_becn(struct hfi1_pportdata *ppd, u8 sl, u32 rlid, u32 lqpn, |
77241056 MM |
1974 | u32 rqpn, u8 svc_type) |
1975 | { | |
1976 | struct cca_timer *cca_timer; | |
1977 | u16 ccti, ccti_incr, ccti_timer, ccti_limit; | |
1978 | u8 trigger_threshold; | |
1979 | struct cc_state *cc_state; | |
b77d713a | 1980 | unsigned long flags; |
77241056 MM |
1981 | |
1982 | if (sl >= OPA_MAX_SLS) | |
1983 | return; | |
1984 | ||
77241056 MM |
1985 | cc_state = get_cc_state(ppd); |
1986 | ||
d125a6c6 | 1987 | if (!cc_state) |
77241056 MM |
1988 | return; |
1989 | ||
1990 | /* | |
1991 | * 1) increase CCTI (for this SL) | |
1992 | * 2) select IPG (i.e., call set_link_ipg()) | |
1993 | * 3) start timer | |
1994 | */ | |
1995 | ccti_limit = cc_state->cct.ccti_limit; | |
1996 | ccti_incr = cc_state->cong_setting.entries[sl].ccti_increase; | |
1997 | ccti_timer = cc_state->cong_setting.entries[sl].ccti_timer; | |
1998 | trigger_threshold = | |
1999 | cc_state->cong_setting.entries[sl].trigger_threshold; | |
2000 | ||
b77d713a | 2001 | spin_lock_irqsave(&ppd->cca_timer_lock, flags); |
77241056 | 2002 | |
d35cf744 | 2003 | cca_timer = &ppd->cca_timer[sl]; |
77241056 MM |
2004 | if (cca_timer->ccti < ccti_limit) { |
2005 | if (cca_timer->ccti + ccti_incr <= ccti_limit) | |
2006 | cca_timer->ccti += ccti_incr; | |
2007 | else | |
2008 | cca_timer->ccti = ccti_limit; | |
2009 | set_link_ipg(ppd); | |
2010 | } | |
2011 | ||
77241056 MM |
2012 | ccti = cca_timer->ccti; |
2013 | ||
2014 | if (!hrtimer_active(&cca_timer->hrtimer)) { | |
2015 | /* ccti_timer is in units of 1.024 usec */ | |
2016 | unsigned long nsec = 1024 * ccti_timer; | |
2017 | ||
2018 | hrtimer_start(&cca_timer->hrtimer, ns_to_ktime(nsec), | |
2019 | HRTIMER_MODE_REL); | |
2020 | } | |
2021 | ||
d35cf744 JJ |
2022 | spin_unlock_irqrestore(&ppd->cca_timer_lock, flags); |
2023 | ||
77241056 MM |
2024 | if ((trigger_threshold != 0) && (ccti >= trigger_threshold)) |
2025 | log_cca_event(ppd, sl, rlid, lqpn, rqpn, svc_type); | |
2026 | } | |
2027 | ||
2028 | /** | |
2029 | * hfi1_rc_rcv - process an incoming RC packet | |
5b6cabb0 | 2030 | * @packet: data packet information |
77241056 MM |
2031 | * |
2032 | * This is called from qp_rcv() to process an incoming RC packet | |
2033 | * for the given QP. | |
b77d713a | 2034 | * May be called at interrupt level. |
77241056 MM |
2035 | */ |
2036 | void hfi1_rc_rcv(struct hfi1_packet *packet) | |
2037 | { | |
2038 | struct hfi1_ctxtdata *rcd = packet->rcd; | |
72c07e2b | 2039 | void *data = packet->payload; |
77241056 | 2040 | u32 tlen = packet->tlen; |
895420dd | 2041 | struct rvt_qp *qp = packet->qp; |
f3e862cb | 2042 | struct hfi1_ibport *ibp = rcd_to_iport(rcd); |
261a4351 | 2043 | struct ib_other_headers *ohdr = packet->ohdr; |
5b6cabb0 | 2044 | u32 bth0 = be32_to_cpu(ohdr->bth[0]); |
9039746c | 2045 | u32 opcode = packet->opcode; |
77241056 | 2046 | u32 hdrsize = packet->hlen; |
5b6cabb0 | 2047 | u32 psn = ib_bth_get_psn(packet->ohdr); |
9039746c | 2048 | u32 pad = packet->pad; |
77241056 MM |
2049 | struct ib_wc wc; |
2050 | u32 pmtu = qp->pmtu; | |
2051 | int diff; | |
2052 | struct ib_reth *reth; | |
2053 | unsigned long flags; | |
4608e4c8 DD |
2054 | int ret; |
2055 | bool is_fecn = false; | |
0128fcea | 2056 | bool copy_last = false; |
a2df0c83 | 2057 | u32 rkey; |
5b6cabb0 | 2058 | u8 extra_bytes = pad + packet->extra_byte + (SIZE_OF_CRC << 2); |
77241056 | 2059 | |
68e78b3d | 2060 | lockdep_assert_held(&qp->r_lock); |
9039746c | 2061 | |
9039746c | 2062 | if (hfi1_ruc_check_hdr(ibp, packet)) |
77241056 MM |
2063 | return; |
2064 | ||
5fd2b562 | 2065 | is_fecn = process_ecn(qp, packet, false); |
77241056 MM |
2066 | |
2067 | /* | |
2068 | * Process responses (ACKs) before anything else. Note that the | |
2069 | * packet sequence number will be for something in the send work | |
2070 | * queue rather than the expected receive packet sequence number. | |
2071 | * In other words, this QP is the requester. | |
2072 | */ | |
2073 | if (opcode >= OP(RDMA_READ_RESPONSE_FIRST) && | |
2074 | opcode <= OP(ATOMIC_ACKNOWLEDGE)) { | |
5b6cabb0 | 2075 | rc_rcv_resp(packet); |
77241056 MM |
2076 | if (is_fecn) |
2077 | goto send_ack; | |
2078 | return; | |
2079 | } | |
2080 | ||
2081 | /* Compute 24 bits worth of difference. */ | |
2082 | diff = delta_psn(psn, qp->r_psn); | |
2083 | if (unlikely(diff)) { | |
2084 | if (rc_rcv_error(ohdr, data, qp, opcode, psn, diff, rcd)) | |
2085 | return; | |
2086 | goto send_ack; | |
2087 | } | |
2088 | ||
2089 | /* Check for opcode sequence errors. */ | |
2090 | switch (qp->r_state) { | |
2091 | case OP(SEND_FIRST): | |
2092 | case OP(SEND_MIDDLE): | |
2093 | if (opcode == OP(SEND_MIDDLE) || | |
2094 | opcode == OP(SEND_LAST) || | |
a2df0c83 JX |
2095 | opcode == OP(SEND_LAST_WITH_IMMEDIATE) || |
2096 | opcode == OP(SEND_LAST_WITH_INVALIDATE)) | |
77241056 MM |
2097 | break; |
2098 | goto nack_inv; | |
2099 | ||
2100 | case OP(RDMA_WRITE_FIRST): | |
2101 | case OP(RDMA_WRITE_MIDDLE): | |
2102 | if (opcode == OP(RDMA_WRITE_MIDDLE) || | |
2103 | opcode == OP(RDMA_WRITE_LAST) || | |
2104 | opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) | |
2105 | break; | |
2106 | goto nack_inv; | |
2107 | ||
2108 | default: | |
2109 | if (opcode == OP(SEND_MIDDLE) || | |
2110 | opcode == OP(SEND_LAST) || | |
2111 | opcode == OP(SEND_LAST_WITH_IMMEDIATE) || | |
a2df0c83 | 2112 | opcode == OP(SEND_LAST_WITH_INVALIDATE) || |
77241056 MM |
2113 | opcode == OP(RDMA_WRITE_MIDDLE) || |
2114 | opcode == OP(RDMA_WRITE_LAST) || | |
2115 | opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) | |
2116 | goto nack_inv; | |
2117 | /* | |
2118 | * Note that it is up to the requester to not send a new | |
2119 | * RDMA read or atomic operation before receiving an ACK | |
2120 | * for the previous operation. | |
2121 | */ | |
2122 | break; | |
2123 | } | |
2124 | ||
54d10c1e | 2125 | if (qp->state == IB_QPS_RTR && !(qp->r_flags & RVT_R_COMM_EST)) |
beb5a042 | 2126 | rvt_comm_est(qp); |
77241056 MM |
2127 | |
2128 | /* OK, process the packet. */ | |
2129 | switch (opcode) { | |
2130 | case OP(SEND_FIRST): | |
ec4274f1 | 2131 | ret = hfi1_rvt_get_rwqe(qp, 0); |
77241056 MM |
2132 | if (ret < 0) |
2133 | goto nack_op_err; | |
2134 | if (!ret) | |
2135 | goto rnr_nak; | |
2136 | qp->r_rcv_len = 0; | |
2137 | /* FALLTHROUGH */ | |
2138 | case OP(SEND_MIDDLE): | |
2139 | case OP(RDMA_WRITE_MIDDLE): | |
2140 | send_middle: | |
2141 | /* Check for invalid length PMTU or posted rwqe len. */ | |
5b6cabb0 DH |
2142 | /* |
2143 | * There will be no padding for 9B packet but 16B packets | |
2144 | * will come in with some padding since we always add | |
2145 | * CRC and LT bytes which will need to be flit aligned | |
2146 | */ | |
2147 | if (unlikely(tlen != (hdrsize + pmtu + extra_bytes))) | |
77241056 MM |
2148 | goto nack_inv; |
2149 | qp->r_rcv_len += pmtu; | |
2150 | if (unlikely(qp->r_rcv_len > qp->r_len)) | |
2151 | goto nack_inv; | |
0128fcea | 2152 | hfi1_copy_sge(&qp->r_sge, data, pmtu, true, false); |
77241056 MM |
2153 | break; |
2154 | ||
2155 | case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE): | |
2156 | /* consume RWQE */ | |
ec4274f1 | 2157 | ret = hfi1_rvt_get_rwqe(qp, 1); |
77241056 MM |
2158 | if (ret < 0) |
2159 | goto nack_op_err; | |
2160 | if (!ret) | |
2161 | goto rnr_nak; | |
2162 | goto send_last_imm; | |
2163 | ||
2164 | case OP(SEND_ONLY): | |
2165 | case OP(SEND_ONLY_WITH_IMMEDIATE): | |
a2df0c83 | 2166 | case OP(SEND_ONLY_WITH_INVALIDATE): |
ec4274f1 | 2167 | ret = hfi1_rvt_get_rwqe(qp, 0); |
77241056 MM |
2168 | if (ret < 0) |
2169 | goto nack_op_err; | |
2170 | if (!ret) | |
2171 | goto rnr_nak; | |
2172 | qp->r_rcv_len = 0; | |
2173 | if (opcode == OP(SEND_ONLY)) | |
2174 | goto no_immediate_data; | |
a2df0c83 JX |
2175 | if (opcode == OP(SEND_ONLY_WITH_INVALIDATE)) |
2176 | goto send_last_inv; | |
6ffeb21f | 2177 | /* FALLTHROUGH -- for SEND_ONLY_WITH_IMMEDIATE */ |
77241056 MM |
2178 | case OP(SEND_LAST_WITH_IMMEDIATE): |
2179 | send_last_imm: | |
2180 | wc.ex.imm_data = ohdr->u.imm_data; | |
2181 | wc.wc_flags = IB_WC_WITH_IMM; | |
2182 | goto send_last; | |
a2df0c83 JX |
2183 | case OP(SEND_LAST_WITH_INVALIDATE): |
2184 | send_last_inv: | |
2185 | rkey = be32_to_cpu(ohdr->u.ieth); | |
2186 | if (rvt_invalidate_rkey(qp, rkey)) | |
2187 | goto no_immediate_data; | |
2188 | wc.ex.invalidate_rkey = rkey; | |
2189 | wc.wc_flags = IB_WC_WITH_INVALIDATE; | |
2190 | goto send_last; | |
77241056 | 2191 | case OP(RDMA_WRITE_LAST): |
0128fcea | 2192 | copy_last = rvt_is_user_qp(qp); |
7b0b01aa DL |
2193 | /* fall through */ |
2194 | case OP(SEND_LAST): | |
77241056 MM |
2195 | no_immediate_data: |
2196 | wc.wc_flags = 0; | |
2197 | wc.ex.imm_data = 0; | |
2198 | send_last: | |
77241056 MM |
2199 | /* Check for invalid length. */ |
2200 | /* LAST len should be >= 1 */ | |
5b6cabb0 | 2201 | if (unlikely(tlen < (hdrsize + extra_bytes))) |
77241056 | 2202 | goto nack_inv; |
5b6cabb0 DH |
2203 | /* Don't count the CRC(and padding and LT byte for 16B). */ |
2204 | tlen -= (hdrsize + extra_bytes); | |
77241056 MM |
2205 | wc.byte_len = tlen + qp->r_rcv_len; |
2206 | if (unlikely(wc.byte_len > qp->r_len)) | |
2207 | goto nack_inv; | |
0128fcea | 2208 | hfi1_copy_sge(&qp->r_sge, data, tlen, true, copy_last); |
ec4274f1 | 2209 | rvt_put_ss(&qp->r_sge); |
77241056 | 2210 | qp->r_msn++; |
53e91d26 | 2211 | if (!__test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags)) |
77241056 MM |
2212 | break; |
2213 | wc.wr_id = qp->r_wr_id; | |
2214 | wc.status = IB_WC_SUCCESS; | |
2215 | if (opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE) || | |
2216 | opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) | |
2217 | wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; | |
2218 | else | |
2219 | wc.opcode = IB_WC_RECV; | |
2220 | wc.qp = &qp->ibqp; | |
2221 | wc.src_qp = qp->remote_qpn; | |
b64581ad | 2222 | wc.slid = rdma_ah_get_dlid(&qp->remote_ah_attr) & U16_MAX; |
77241056 MM |
2223 | /* |
2224 | * It seems that IB mandates the presence of an SL in a | |
2225 | * work completion only for the UD transport (see section | |
2226 | * 11.4.2 of IBTA Vol. 1). | |
2227 | * | |
2228 | * However, the way the SL is chosen below is consistent | |
2229 | * with the way that IB/qib works and is trying avoid | |
2230 | * introducing incompatibilities. | |
2231 | * | |
2232 | * See also OPA Vol. 1, section 9.7.6, and table 9-17. | |
2233 | */ | |
d8966fcd | 2234 | wc.sl = rdma_ah_get_sl(&qp->remote_ah_attr); |
77241056 MM |
2235 | /* zero fields that are N/A */ |
2236 | wc.vendor_err = 0; | |
2237 | wc.pkey_index = 0; | |
2238 | wc.dlid_path_bits = 0; | |
2239 | wc.port_num = 0; | |
2240 | /* Signal completion event if the solicited bit is set. */ | |
abd712da DD |
2241 | rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc, |
2242 | (bth0 & IB_BTH_SOLICITED) != 0); | |
77241056 MM |
2243 | break; |
2244 | ||
77241056 | 2245 | case OP(RDMA_WRITE_ONLY): |
0128fcea | 2246 | copy_last = rvt_is_user_qp(qp); |
7b0b01aa DL |
2247 | /* fall through */ |
2248 | case OP(RDMA_WRITE_FIRST): | |
77241056 MM |
2249 | case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): |
2250 | if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) | |
2251 | goto nack_inv; | |
2252 | /* consume RWQE */ | |
2253 | reth = &ohdr->u.rc.reth; | |
2254 | qp->r_len = be32_to_cpu(reth->length); | |
2255 | qp->r_rcv_len = 0; | |
2256 | qp->r_sge.sg_list = NULL; | |
2257 | if (qp->r_len != 0) { | |
2258 | u32 rkey = be32_to_cpu(reth->rkey); | |
261a4351 | 2259 | u64 vaddr = get_ib_reth_vaddr(reth); |
77241056 MM |
2260 | int ok; |
2261 | ||
2262 | /* Check rkey & NAK */ | |
895420dd DD |
2263 | ok = rvt_rkey_ok(qp, &qp->r_sge.sge, qp->r_len, vaddr, |
2264 | rkey, IB_ACCESS_REMOTE_WRITE); | |
77241056 MM |
2265 | if (unlikely(!ok)) |
2266 | goto nack_acc; | |
2267 | qp->r_sge.num_sge = 1; | |
2268 | } else { | |
2269 | qp->r_sge.num_sge = 0; | |
2270 | qp->r_sge.sge.mr = NULL; | |
2271 | qp->r_sge.sge.vaddr = NULL; | |
2272 | qp->r_sge.sge.length = 0; | |
2273 | qp->r_sge.sge.sge_length = 0; | |
2274 | } | |
2275 | if (opcode == OP(RDMA_WRITE_FIRST)) | |
2276 | goto send_middle; | |
2277 | else if (opcode == OP(RDMA_WRITE_ONLY)) | |
2278 | goto no_immediate_data; | |
ec4274f1 | 2279 | ret = hfi1_rvt_get_rwqe(qp, 1); |
77241056 MM |
2280 | if (ret < 0) |
2281 | goto nack_op_err; | |
1feb4006 MM |
2282 | if (!ret) { |
2283 | /* peer will send again */ | |
2284 | rvt_put_ss(&qp->r_sge); | |
77241056 | 2285 | goto rnr_nak; |
1feb4006 | 2286 | } |
77241056 MM |
2287 | wc.ex.imm_data = ohdr->u.rc.imm_data; |
2288 | wc.wc_flags = IB_WC_WITH_IMM; | |
2289 | goto send_last; | |
2290 | ||
2291 | case OP(RDMA_READ_REQUEST): { | |
895420dd | 2292 | struct rvt_ack_entry *e; |
77241056 MM |
2293 | u32 len; |
2294 | u8 next; | |
2295 | ||
2296 | if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ))) | |
2297 | goto nack_inv; | |
2298 | next = qp->r_head_ack_queue + 1; | |
2299 | /* s_ack_queue is size HFI1_MAX_RDMA_ATOMIC+1 so use > not >= */ | |
2300 | if (next > HFI1_MAX_RDMA_ATOMIC) | |
2301 | next = 0; | |
2302 | spin_lock_irqsave(&qp->s_lock, flags); | |
2303 | if (unlikely(next == qp->s_tail_ack_queue)) { | |
2304 | if (!qp->s_ack_queue[next].sent) | |
2305 | goto nack_inv_unlck; | |
2306 | update_ack_queue(qp, next); | |
2307 | } | |
2308 | e = &qp->s_ack_queue[qp->r_head_ack_queue]; | |
2309 | if (e->opcode == OP(RDMA_READ_REQUEST) && e->rdma_sge.mr) { | |
895420dd | 2310 | rvt_put_mr(e->rdma_sge.mr); |
77241056 MM |
2311 | e->rdma_sge.mr = NULL; |
2312 | } | |
2313 | reth = &ohdr->u.rc.reth; | |
2314 | len = be32_to_cpu(reth->length); | |
2315 | if (len) { | |
2316 | u32 rkey = be32_to_cpu(reth->rkey); | |
261a4351 | 2317 | u64 vaddr = get_ib_reth_vaddr(reth); |
77241056 MM |
2318 | int ok; |
2319 | ||
2320 | /* Check rkey & NAK */ | |
895420dd DD |
2321 | ok = rvt_rkey_ok(qp, &e->rdma_sge, len, vaddr, |
2322 | rkey, IB_ACCESS_REMOTE_READ); | |
77241056 MM |
2323 | if (unlikely(!ok)) |
2324 | goto nack_acc_unlck; | |
2325 | /* | |
2326 | * Update the next expected PSN. We add 1 later | |
2327 | * below, so only add the remainder here. | |
2328 | */ | |
5dc80605 | 2329 | qp->r_psn += rvt_div_mtu(qp, len - 1); |
77241056 MM |
2330 | } else { |
2331 | e->rdma_sge.mr = NULL; | |
2332 | e->rdma_sge.vaddr = NULL; | |
2333 | e->rdma_sge.length = 0; | |
2334 | e->rdma_sge.sge_length = 0; | |
2335 | } | |
2336 | e->opcode = opcode; | |
2337 | e->sent = 0; | |
2338 | e->psn = psn; | |
2339 | e->lpsn = qp->r_psn; | |
2340 | /* | |
2341 | * We need to increment the MSN here instead of when we | |
2342 | * finish sending the result since a duplicate request would | |
2343 | * increment it more than once. | |
2344 | */ | |
2345 | qp->r_msn++; | |
2346 | qp->r_psn++; | |
2347 | qp->r_state = opcode; | |
2348 | qp->r_nak_state = 0; | |
2349 | qp->r_head_ack_queue = next; | |
2350 | ||
ca00c62b | 2351 | /* Schedule the send engine. */ |
54d10c1e | 2352 | qp->s_flags |= RVT_S_RESP_PENDING; |
77241056 MM |
2353 | hfi1_schedule_send(qp); |
2354 | ||
2355 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
2356 | if (is_fecn) | |
2357 | goto send_ack; | |
2358 | return; | |
2359 | } | |
2360 | ||
2361 | case OP(COMPARE_SWAP): | |
2362 | case OP(FETCH_ADD): { | |
2363 | struct ib_atomic_eth *ateth; | |
895420dd | 2364 | struct rvt_ack_entry *e; |
77241056 MM |
2365 | u64 vaddr; |
2366 | atomic64_t *maddr; | |
2367 | u64 sdata; | |
2368 | u32 rkey; | |
2369 | u8 next; | |
2370 | ||
2371 | if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) | |
2372 | goto nack_inv; | |
2373 | next = qp->r_head_ack_queue + 1; | |
2374 | if (next > HFI1_MAX_RDMA_ATOMIC) | |
2375 | next = 0; | |
2376 | spin_lock_irqsave(&qp->s_lock, flags); | |
2377 | if (unlikely(next == qp->s_tail_ack_queue)) { | |
2378 | if (!qp->s_ack_queue[next].sent) | |
2379 | goto nack_inv_unlck; | |
2380 | update_ack_queue(qp, next); | |
2381 | } | |
2382 | e = &qp->s_ack_queue[qp->r_head_ack_queue]; | |
2383 | if (e->opcode == OP(RDMA_READ_REQUEST) && e->rdma_sge.mr) { | |
895420dd | 2384 | rvt_put_mr(e->rdma_sge.mr); |
77241056 MM |
2385 | e->rdma_sge.mr = NULL; |
2386 | } | |
2387 | ateth = &ohdr->u.atomic_eth; | |
261a4351 | 2388 | vaddr = get_ib_ateth_vaddr(ateth); |
77241056 MM |
2389 | if (unlikely(vaddr & (sizeof(u64) - 1))) |
2390 | goto nack_inv_unlck; | |
2391 | rkey = be32_to_cpu(ateth->rkey); | |
2392 | /* Check rkey & NAK */ | |
895420dd DD |
2393 | if (unlikely(!rvt_rkey_ok(qp, &qp->r_sge.sge, sizeof(u64), |
2394 | vaddr, rkey, | |
2395 | IB_ACCESS_REMOTE_ATOMIC))) | |
77241056 MM |
2396 | goto nack_acc_unlck; |
2397 | /* Perform atomic OP and save result. */ | |
50e5dcbe | 2398 | maddr = (atomic64_t *)qp->r_sge.sge.vaddr; |
261a4351 | 2399 | sdata = get_ib_ateth_swap(ateth); |
77241056 | 2400 | e->atomic_data = (opcode == OP(FETCH_ADD)) ? |
50e5dcbe JJ |
2401 | (u64)atomic64_add_return(sdata, maddr) - sdata : |
2402 | (u64)cmpxchg((u64 *)qp->r_sge.sge.vaddr, | |
261a4351 | 2403 | get_ib_ateth_compare(ateth), |
77241056 | 2404 | sdata); |
895420dd | 2405 | rvt_put_mr(qp->r_sge.sge.mr); |
77241056 MM |
2406 | qp->r_sge.num_sge = 0; |
2407 | e->opcode = opcode; | |
2408 | e->sent = 0; | |
2409 | e->psn = psn; | |
2410 | e->lpsn = psn; | |
2411 | qp->r_msn++; | |
2412 | qp->r_psn++; | |
2413 | qp->r_state = opcode; | |
2414 | qp->r_nak_state = 0; | |
2415 | qp->r_head_ack_queue = next; | |
2416 | ||
ca00c62b | 2417 | /* Schedule the send engine. */ |
54d10c1e | 2418 | qp->s_flags |= RVT_S_RESP_PENDING; |
77241056 MM |
2419 | hfi1_schedule_send(qp); |
2420 | ||
2421 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
2422 | if (is_fecn) | |
2423 | goto send_ack; | |
2424 | return; | |
2425 | } | |
2426 | ||
2427 | default: | |
2428 | /* NAK unknown opcodes. */ | |
2429 | goto nack_inv; | |
2430 | } | |
2431 | qp->r_psn++; | |
2432 | qp->r_state = opcode; | |
2433 | qp->r_ack_psn = psn; | |
2434 | qp->r_nak_state = 0; | |
2435 | /* Send an ACK if requested or required. */ | |
7c091e5c MM |
2436 | if (psn & IB_BTH_REQ_ACK) { |
2437 | if (packet->numpkt == 0) { | |
2438 | rc_cancel_ack(qp); | |
2439 | goto send_ack; | |
2440 | } | |
688f21c0 | 2441 | if (qp->r_adefered >= HFI1_PSN_CREDIT) { |
7c091e5c MM |
2442 | rc_cancel_ack(qp); |
2443 | goto send_ack; | |
2444 | } | |
2445 | if (unlikely(is_fecn)) { | |
2446 | rc_cancel_ack(qp); | |
2447 | goto send_ack; | |
2448 | } | |
688f21c0 | 2449 | qp->r_adefered++; |
7c091e5c MM |
2450 | rc_defered_ack(rcd, qp); |
2451 | } | |
77241056 MM |
2452 | return; |
2453 | ||
2454 | rnr_nak: | |
bf640096 | 2455 | qp->r_nak_state = qp->r_min_rnr_timer | IB_RNR_NAK; |
77241056 MM |
2456 | qp->r_ack_psn = qp->r_psn; |
2457 | /* Queue RNR NAK for later */ | |
2fd36865 | 2458 | rc_defered_ack(rcd, qp); |
77241056 MM |
2459 | return; |
2460 | ||
2461 | nack_op_err: | |
beb5a042 | 2462 | rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR); |
77241056 MM |
2463 | qp->r_nak_state = IB_NAK_REMOTE_OPERATIONAL_ERROR; |
2464 | qp->r_ack_psn = qp->r_psn; | |
2465 | /* Queue NAK for later */ | |
2fd36865 | 2466 | rc_defered_ack(rcd, qp); |
77241056 MM |
2467 | return; |
2468 | ||
2469 | nack_inv_unlck: | |
2470 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
2471 | nack_inv: | |
beb5a042 | 2472 | rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR); |
77241056 MM |
2473 | qp->r_nak_state = IB_NAK_INVALID_REQUEST; |
2474 | qp->r_ack_psn = qp->r_psn; | |
2475 | /* Queue NAK for later */ | |
2fd36865 | 2476 | rc_defered_ack(rcd, qp); |
77241056 MM |
2477 | return; |
2478 | ||
2479 | nack_acc_unlck: | |
2480 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
2481 | nack_acc: | |
beb5a042 | 2482 | rvt_rc_error(qp, IB_WC_LOC_PROT_ERR); |
77241056 MM |
2483 | qp->r_nak_state = IB_NAK_REMOTE_ACCESS_ERROR; |
2484 | qp->r_ack_psn = qp->r_psn; | |
2485 | send_ack: | |
2486 | hfi1_send_rc_ack(rcd, qp, is_fecn); | |
2487 | } | |
2488 | ||
2489 | void hfi1_rc_hdrerr( | |
2490 | struct hfi1_ctxtdata *rcd, | |
9039746c | 2491 | struct hfi1_packet *packet, |
895420dd | 2492 | struct rvt_qp *qp) |
77241056 | 2493 | { |
f3e862cb | 2494 | struct hfi1_ibport *ibp = rcd_to_iport(rcd); |
77241056 | 2495 | int diff; |
49c32037 | 2496 | u32 opcode; |
9039746c | 2497 | u32 psn; |
77241056 | 2498 | |
9039746c | 2499 | if (hfi1_ruc_check_hdr(ibp, packet)) |
77241056 MM |
2500 | return; |
2501 | ||
9039746c DH |
2502 | psn = ib_bth_get_psn(packet->ohdr); |
2503 | opcode = ib_bth_get_opcode(packet->ohdr); | |
77241056 MM |
2504 | |
2505 | /* Only deal with RDMA Writes for now */ | |
2506 | if (opcode < IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST) { | |
2507 | diff = delta_psn(psn, qp->r_psn); | |
2508 | if (!qp->r_nak_state && diff >= 0) { | |
4eb06882 | 2509 | ibp->rvp.n_rc_seqnak++; |
77241056 MM |
2510 | qp->r_nak_state = IB_NAK_PSN_ERROR; |
2511 | /* Use the expected PSN. */ | |
2512 | qp->r_ack_psn = qp->r_psn; | |
2513 | /* | |
2514 | * Wait to send the sequence | |
2515 | * NAK until all packets | |
2516 | * in the receive queue have | |
2517 | * been processed. | |
2518 | * Otherwise, we end up | |
2519 | * propagating congestion. | |
2520 | */ | |
2fd36865 | 2521 | rc_defered_ack(rcd, qp); |
77241056 MM |
2522 | } /* Out of sequence NAK */ |
2523 | } /* QP Request NAKs */ | |
2524 | } |