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Commit | Line | Data |
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97f9efbc | 1 | /* |
e7eacd36 | 2 | * Copyright (c) 2006, 2007, 2008 QLogic Corporation. All rights reserved. |
97f9efbc BS |
3 | * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved. |
4 | * | |
5 | * This software is available to you under a choice of one of two | |
6 | * licenses. You may choose to be licensed under the terms of the GNU | |
7 | * General Public License (GPL) Version 2, available from the file | |
8 | * COPYING in the main directory of this source tree, or the | |
9 | * OpenIB.org BSD license below: | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or | |
12 | * without modification, are permitted provided that the following | |
13 | * conditions are met: | |
14 | * | |
15 | * - Redistributions of source code must retain the above | |
16 | * copyright notice, this list of conditions and the following | |
17 | * disclaimer. | |
18 | * | |
19 | * - Redistributions in binary form must reproduce the above | |
20 | * copyright notice, this list of conditions and the following | |
21 | * disclaimer in the documentation and/or other materials | |
22 | * provided with the distribution. | |
23 | * | |
24 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
25 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
26 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
27 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
28 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
29 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
30 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
31 | * SOFTWARE. | |
32 | */ | |
33 | ||
d98b1937 RC |
34 | #include <linux/io.h> |
35 | ||
97f9efbc | 36 | #include "ipath_verbs.h" |
34b2aafe | 37 | #include "ipath_kernel.h" |
97f9efbc BS |
38 | |
39 | /* cut down ridiculously long IB macro names */ | |
40 | #define OP(x) IB_OPCODE_RC_##x | |
41 | ||
3859e39d RC |
42 | static u32 restart_sge(struct ipath_sge_state *ss, struct ipath_swqe *wqe, |
43 | u32 psn, u32 pmtu) | |
44 | { | |
45 | u32 len; | |
46 | ||
47 | len = ((psn - wqe->psn) & IPATH_PSN_MASK) * pmtu; | |
48 | ss->sge = wqe->sg_list[0]; | |
49 | ss->sg_list = wqe->sg_list + 1; | |
50 | ss->num_sge = wqe->wr.num_sge; | |
51 | ipath_skip_sge(ss, len); | |
52 | return wqe->length - len; | |
53 | } | |
54 | ||
97f9efbc BS |
55 | /** |
56 | * ipath_init_restart- initialize the qp->s_sge after a restart | |
57 | * @qp: the QP who's SGE we're restarting | |
58 | * @wqe: the work queue to initialize the QP's SGE from | |
59 | * | |
12eef41f | 60 | * The QP s_lock should be held and interrupts disabled. |
97f9efbc BS |
61 | */ |
62 | static void ipath_init_restart(struct ipath_qp *qp, struct ipath_swqe *wqe) | |
63 | { | |
64 | struct ipath_ibdev *dev; | |
97f9efbc | 65 | |
3859e39d RC |
66 | qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn, |
67 | ib_mtu_enum_to_int(qp->path_mtu)); | |
97f9efbc BS |
68 | dev = to_idev(qp->ibqp.device); |
69 | spin_lock(&dev->pending_lock); | |
94b8d9f9 | 70 | if (list_empty(&qp->timerwait)) |
97f9efbc BS |
71 | list_add_tail(&qp->timerwait, |
72 | &dev->pending[dev->pending_index]); | |
73 | spin_unlock(&dev->pending_lock); | |
74 | } | |
75 | ||
76 | /** | |
77 | * ipath_make_rc_ack - construct a response packet (ACK, NAK, or RDMA read) | |
78 | * @qp: a pointer to the QP | |
79 | * @ohdr: a pointer to the IB header being constructed | |
80 | * @pmtu: the path MTU | |
81 | * | |
3859e39d RC |
82 | * Return 1 if constructed; otherwise, return 0. |
83 | * Note that we are in the responder's side of the QP context. | |
97f9efbc BS |
84 | * Note the QP s_lock must be held. |
85 | */ | |
4ee97180 RC |
86 | static int ipath_make_rc_ack(struct ipath_ibdev *dev, struct ipath_qp *qp, |
87 | struct ipath_other_headers *ohdr, u32 pmtu) | |
97f9efbc | 88 | { |
3859e39d | 89 | struct ipath_ack_entry *e; |
97f9efbc BS |
90 | u32 hwords; |
91 | u32 len; | |
92 | u32 bth0; | |
3859e39d | 93 | u32 bth2; |
97f9efbc | 94 | |
e509be89 RC |
95 | /* Don't send an ACK if we aren't supposed to. */ |
96 | if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_RECV_OK)) | |
97 | goto bail; | |
98 | ||
97f9efbc BS |
99 | /* header size in 32-bit words LRH+BTH = (8+12)/4. */ |
100 | hwords = 5; | |
101 | ||
97f9efbc | 102 | switch (qp->s_ack_state) { |
3859e39d RC |
103 | case OP(RDMA_READ_RESPONSE_LAST): |
104 | case OP(RDMA_READ_RESPONSE_ONLY): | |
105 | case OP(ATOMIC_ACKNOWLEDGE): | |
154257f3 RC |
106 | /* |
107 | * We can increment the tail pointer now that the last | |
108 | * response has been sent instead of only being | |
109 | * constructed. | |
110 | */ | |
111 | if (++qp->s_tail_ack_queue > IPATH_MAX_RDMA_ATOMIC) | |
112 | qp->s_tail_ack_queue = 0; | |
3859e39d | 113 | /* FALLTHROUGH */ |
154257f3 | 114 | case OP(SEND_ONLY): |
3859e39d RC |
115 | case OP(ACKNOWLEDGE): |
116 | /* Check for no next entry in the queue. */ | |
117 | if (qp->r_head_ack_queue == qp->s_tail_ack_queue) { | |
118 | if (qp->s_flags & IPATH_S_ACK_PENDING) | |
119 | goto normal; | |
154257f3 | 120 | qp->s_ack_state = OP(ACKNOWLEDGE); |
3859e39d RC |
121 | goto bail; |
122 | } | |
123 | ||
124 | e = &qp->s_ack_queue[qp->s_tail_ack_queue]; | |
125 | if (e->opcode == OP(RDMA_READ_REQUEST)) { | |
126 | /* Copy SGE state in case we need to resend */ | |
127 | qp->s_ack_rdma_sge = e->rdma_sge; | |
128 | qp->s_cur_sge = &qp->s_ack_rdma_sge; | |
129 | len = e->rdma_sge.sge.sge_length; | |
130 | if (len > pmtu) { | |
131 | len = pmtu; | |
132 | qp->s_ack_state = OP(RDMA_READ_RESPONSE_FIRST); | |
d781b129 | 133 | } else { |
3859e39d | 134 | qp->s_ack_state = OP(RDMA_READ_RESPONSE_ONLY); |
d781b129 RC |
135 | e->sent = 1; |
136 | } | |
3859e39d RC |
137 | ohdr->u.aeth = ipath_compute_aeth(qp); |
138 | hwords++; | |
139 | qp->s_ack_rdma_psn = e->psn; | |
140 | bth2 = qp->s_ack_rdma_psn++ & IPATH_PSN_MASK; | |
141 | } else { | |
142 | /* COMPARE_SWAP or FETCH_ADD */ | |
143 | qp->s_cur_sge = NULL; | |
144 | len = 0; | |
145 | qp->s_ack_state = OP(ATOMIC_ACKNOWLEDGE); | |
146 | ohdr->u.at.aeth = ipath_compute_aeth(qp); | |
147 | ohdr->u.at.atomic_ack_eth[0] = | |
148 | cpu_to_be32(e->atomic_data >> 32); | |
149 | ohdr->u.at.atomic_ack_eth[1] = | |
150 | cpu_to_be32(e->atomic_data); | |
151 | hwords += sizeof(ohdr->u.at) / sizeof(u32); | |
152 | bth2 = e->psn; | |
d781b129 | 153 | e->sent = 1; |
3859e39d | 154 | } |
97f9efbc | 155 | bth0 = qp->s_ack_state << 24; |
97f9efbc BS |
156 | break; |
157 | ||
158 | case OP(RDMA_READ_RESPONSE_FIRST): | |
159 | qp->s_ack_state = OP(RDMA_READ_RESPONSE_MIDDLE); | |
160 | /* FALLTHROUGH */ | |
161 | case OP(RDMA_READ_RESPONSE_MIDDLE): | |
3859e39d | 162 | len = qp->s_ack_rdma_sge.sge.sge_length; |
97f9efbc BS |
163 | if (len > pmtu) |
164 | len = pmtu; | |
165 | else { | |
166 | ohdr->u.aeth = ipath_compute_aeth(qp); | |
167 | hwords++; | |
168 | qp->s_ack_state = OP(RDMA_READ_RESPONSE_LAST); | |
d781b129 | 169 | qp->s_ack_queue[qp->s_tail_ack_queue].sent = 1; |
97f9efbc | 170 | } |
97f9efbc | 171 | bth0 = qp->s_ack_state << 24; |
3859e39d | 172 | bth2 = qp->s_ack_rdma_psn++ & IPATH_PSN_MASK; |
97f9efbc BS |
173 | break; |
174 | ||
175 | default: | |
3859e39d | 176 | normal: |
12eef41f | 177 | /* |
3859e39d RC |
178 | * Send a regular ACK. |
179 | * Set the s_ack_state so we wait until after sending | |
180 | * the ACK before setting s_ack_state to ACKNOWLEDGE | |
181 | * (see above). | |
12eef41f | 182 | */ |
154257f3 | 183 | qp->s_ack_state = OP(SEND_ONLY); |
3859e39d RC |
184 | qp->s_flags &= ~IPATH_S_ACK_PENDING; |
185 | qp->s_cur_sge = NULL; | |
12eef41f | 186 | if (qp->s_nak_state) |
3859e39d RC |
187 | ohdr->u.aeth = |
188 | cpu_to_be32((qp->r_msn & IPATH_MSN_MASK) | | |
189 | (qp->s_nak_state << | |
190 | IPATH_AETH_CREDIT_SHIFT)); | |
12eef41f BS |
191 | else |
192 | ohdr->u.aeth = ipath_compute_aeth(qp); | |
97f9efbc | 193 | hwords++; |
3859e39d RC |
194 | len = 0; |
195 | bth0 = OP(ACKNOWLEDGE) << 24; | |
196 | bth2 = qp->s_ack_psn & IPATH_PSN_MASK; | |
97f9efbc BS |
197 | } |
198 | qp->s_hdrwords = hwords; | |
97f9efbc | 199 | qp->s_cur_size = len; |
4ee97180 | 200 | ipath_make_ruc_header(dev, qp, ohdr, bth0, bth2); |
3859e39d | 201 | return 1; |
97f9efbc | 202 | |
12eef41f | 203 | bail: |
3859e39d | 204 | return 0; |
97f9efbc BS |
205 | } |
206 | ||
207 | /** | |
208 | * ipath_make_rc_req - construct a request packet (SEND, RDMA r/w, ATOMIC) | |
209 | * @qp: a pointer to the QP | |
97f9efbc BS |
210 | * |
211 | * Return 1 if constructed; otherwise, return 0. | |
97f9efbc | 212 | */ |
4ee97180 | 213 | int ipath_make_rc_req(struct ipath_qp *qp) |
97f9efbc BS |
214 | { |
215 | struct ipath_ibdev *dev = to_idev(qp->ibqp.device); | |
4ee97180 | 216 | struct ipath_other_headers *ohdr; |
97f9efbc BS |
217 | struct ipath_sge_state *ss; |
218 | struct ipath_swqe *wqe; | |
219 | u32 hwords; | |
220 | u32 len; | |
221 | u32 bth0; | |
222 | u32 bth2; | |
4ee97180 | 223 | u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu); |
97f9efbc | 224 | char newreq; |
4ee97180 RC |
225 | unsigned long flags; |
226 | int ret = 0; | |
227 | ||
228 | ohdr = &qp->s_hdr.u.oth; | |
229 | if (qp->remote_ah_attr.ah_flags & IB_AH_GRH) | |
230 | ohdr = &qp->s_hdr.u.l.oth; | |
231 | ||
232 | /* | |
233 | * The lock is needed to synchronize between the sending tasklet, | |
234 | * the receive interrupt handler, and timeout resends. | |
235 | */ | |
236 | spin_lock_irqsave(&qp->s_lock, flags); | |
97f9efbc | 237 | |
3859e39d RC |
238 | /* Sending responses has higher priority over sending requests. */ |
239 | if ((qp->r_head_ack_queue != qp->s_tail_ack_queue || | |
240 | (qp->s_flags & IPATH_S_ACK_PENDING) || | |
154257f3 | 241 | qp->s_ack_state != OP(ACKNOWLEDGE)) && |
4ee97180 | 242 | ipath_make_rc_ack(dev, qp, ohdr, pmtu)) |
3859e39d RC |
243 | goto done; |
244 | ||
e509be89 RC |
245 | if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK)) { |
246 | if (!(ib_ipath_state_ops[qp->state] & IPATH_FLUSH_SEND)) | |
247 | goto bail; | |
248 | /* We are in the error state, flush the work request. */ | |
249 | if (qp->s_last == qp->s_head) | |
250 | goto bail; | |
251 | /* If DMAs are in progress, we can't flush immediately. */ | |
252 | if (atomic_read(&qp->s_dma_busy)) { | |
253 | qp->s_flags |= IPATH_S_WAIT_DMA; | |
254 | goto bail; | |
255 | } | |
256 | wqe = get_swqe_ptr(qp, qp->s_last); | |
257 | ipath_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR); | |
258 | goto done; | |
259 | } | |
97f9efbc | 260 | |
e509be89 RC |
261 | /* Leave BUSY set until RNR timeout. */ |
262 | if (qp->s_rnr_timeout) { | |
263 | qp->s_flags |= IPATH_S_WAITING; | |
3859e39d | 264 | goto bail; |
6022943e BS |
265 | } |
266 | ||
97f9efbc BS |
267 | /* header size in 32-bit words LRH+BTH = (8+12)/4. */ |
268 | hwords = 5; | |
1dd6a1be | 269 | bth0 = 1 << 22; /* Set M bit */ |
97f9efbc BS |
270 | |
271 | /* Send a request. */ | |
272 | wqe = get_swqe_ptr(qp, qp->s_cur); | |
273 | switch (qp->s_state) { | |
274 | default: | |
e509be89 RC |
275 | if (!(ib_ipath_state_ops[qp->state] & |
276 | IPATH_PROCESS_NEXT_SEND_OK)) | |
277 | goto bail; | |
97f9efbc BS |
278 | /* |
279 | * Resend an old request or start a new one. | |
280 | * | |
281 | * We keep track of the current SWQE so that | |
282 | * we don't reset the "furthest progress" state | |
283 | * if we need to back up. | |
284 | */ | |
285 | newreq = 0; | |
286 | if (qp->s_cur == qp->s_tail) { | |
287 | /* Check if send work queue is empty. */ | |
288 | if (qp->s_tail == qp->s_head) | |
3859e39d RC |
289 | goto bail; |
290 | /* | |
291 | * If a fence is requested, wait for previous | |
292 | * RDMA read and atomic operations to finish. | |
293 | */ | |
294 | if ((wqe->wr.send_flags & IB_SEND_FENCE) && | |
295 | qp->s_num_rd_atomic) { | |
296 | qp->s_flags |= IPATH_S_FENCE_PENDING; | |
297 | goto bail; | |
298 | } | |
6022943e | 299 | wqe->psn = qp->s_next_psn; |
97f9efbc BS |
300 | newreq = 1; |
301 | } | |
302 | /* | |
303 | * Note that we have to be careful not to modify the | |
304 | * original work request since we may need to resend | |
305 | * it. | |
306 | */ | |
13b18c86 | 307 | len = wqe->length; |
97f9efbc BS |
308 | ss = &qp->s_sge; |
309 | bth2 = 0; | |
310 | switch (wqe->wr.opcode) { | |
311 | case IB_WR_SEND: | |
312 | case IB_WR_SEND_WITH_IMM: | |
313 | /* If no credit, return. */ | |
314 | if (qp->s_lsn != (u32) -1 && | |
e509be89 RC |
315 | ipath_cmp24(wqe->ssn, qp->s_lsn + 1) > 0) { |
316 | qp->s_flags |= IPATH_S_WAIT_SSN_CREDIT; | |
3859e39d | 317 | goto bail; |
e509be89 | 318 | } |
97f9efbc BS |
319 | wqe->lpsn = wqe->psn; |
320 | if (len > pmtu) { | |
321 | wqe->lpsn += (len - 1) / pmtu; | |
322 | qp->s_state = OP(SEND_FIRST); | |
323 | len = pmtu; | |
324 | break; | |
325 | } | |
326 | if (wqe->wr.opcode == IB_WR_SEND) | |
327 | qp->s_state = OP(SEND_ONLY); | |
328 | else { | |
329 | qp->s_state = OP(SEND_ONLY_WITH_IMMEDIATE); | |
330 | /* Immediate data comes after the BTH */ | |
0f39cf3d | 331 | ohdr->u.imm_data = wqe->wr.ex.imm_data; |
97f9efbc BS |
332 | hwords += 1; |
333 | } | |
334 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
335 | bth0 |= 1 << 23; | |
336 | bth2 = 1 << 31; /* Request ACK. */ | |
337 | if (++qp->s_cur == qp->s_size) | |
338 | qp->s_cur = 0; | |
339 | break; | |
340 | ||
341 | case IB_WR_RDMA_WRITE: | |
6700efdf | 342 | if (newreq && qp->s_lsn != (u32) -1) |
97f9efbc BS |
343 | qp->s_lsn++; |
344 | /* FALLTHROUGH */ | |
345 | case IB_WR_RDMA_WRITE_WITH_IMM: | |
346 | /* If no credit, return. */ | |
347 | if (qp->s_lsn != (u32) -1 && | |
e509be89 RC |
348 | ipath_cmp24(wqe->ssn, qp->s_lsn + 1) > 0) { |
349 | qp->s_flags |= IPATH_S_WAIT_SSN_CREDIT; | |
3859e39d | 350 | goto bail; |
e509be89 | 351 | } |
97f9efbc BS |
352 | ohdr->u.rc.reth.vaddr = |
353 | cpu_to_be64(wqe->wr.wr.rdma.remote_addr); | |
354 | ohdr->u.rc.reth.rkey = | |
355 | cpu_to_be32(wqe->wr.wr.rdma.rkey); | |
356 | ohdr->u.rc.reth.length = cpu_to_be32(len); | |
3859e39d | 357 | hwords += sizeof(struct ib_reth) / sizeof(u32); |
97f9efbc BS |
358 | wqe->lpsn = wqe->psn; |
359 | if (len > pmtu) { | |
360 | wqe->lpsn += (len - 1) / pmtu; | |
361 | qp->s_state = OP(RDMA_WRITE_FIRST); | |
362 | len = pmtu; | |
363 | break; | |
364 | } | |
365 | if (wqe->wr.opcode == IB_WR_RDMA_WRITE) | |
366 | qp->s_state = OP(RDMA_WRITE_ONLY); | |
367 | else { | |
368 | qp->s_state = | |
369 | OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE); | |
6700efdf | 370 | /* Immediate data comes after RETH */ |
0f39cf3d | 371 | ohdr->u.rc.imm_data = wqe->wr.ex.imm_data; |
97f9efbc BS |
372 | hwords += 1; |
373 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
374 | bth0 |= 1 << 23; | |
375 | } | |
376 | bth2 = 1 << 31; /* Request ACK. */ | |
377 | if (++qp->s_cur == qp->s_size) | |
378 | qp->s_cur = 0; | |
379 | break; | |
380 | ||
381 | case IB_WR_RDMA_READ: | |
3859e39d RC |
382 | /* |
383 | * Don't allow more operations to be started | |
384 | * than the QP limits allow. | |
385 | */ | |
97f9efbc | 386 | if (newreq) { |
3859e39d RC |
387 | if (qp->s_num_rd_atomic >= |
388 | qp->s_max_rd_atomic) { | |
389 | qp->s_flags |= IPATH_S_RDMAR_PENDING; | |
390 | goto bail; | |
391 | } | |
392 | qp->s_num_rd_atomic++; | |
6700efdf BS |
393 | if (qp->s_lsn != (u32) -1) |
394 | qp->s_lsn++; | |
97f9efbc BS |
395 | /* |
396 | * Adjust s_next_psn to count the | |
397 | * expected number of responses. | |
398 | */ | |
399 | if (len > pmtu) | |
400 | qp->s_next_psn += (len - 1) / pmtu; | |
401 | wqe->lpsn = qp->s_next_psn++; | |
402 | } | |
3859e39d RC |
403 | ohdr->u.rc.reth.vaddr = |
404 | cpu_to_be64(wqe->wr.wr.rdma.remote_addr); | |
405 | ohdr->u.rc.reth.rkey = | |
406 | cpu_to_be32(wqe->wr.wr.rdma.rkey); | |
407 | ohdr->u.rc.reth.length = cpu_to_be32(len); | |
408 | qp->s_state = OP(RDMA_READ_REQUEST); | |
409 | hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32); | |
97f9efbc BS |
410 | ss = NULL; |
411 | len = 0; | |
412 | if (++qp->s_cur == qp->s_size) | |
413 | qp->s_cur = 0; | |
414 | break; | |
415 | ||
416 | case IB_WR_ATOMIC_CMP_AND_SWP: | |
417 | case IB_WR_ATOMIC_FETCH_AND_ADD: | |
3859e39d RC |
418 | /* |
419 | * Don't allow more operations to be started | |
420 | * than the QP limits allow. | |
421 | */ | |
97f9efbc | 422 | if (newreq) { |
3859e39d RC |
423 | if (qp->s_num_rd_atomic >= |
424 | qp->s_max_rd_atomic) { | |
425 | qp->s_flags |= IPATH_S_RDMAR_PENDING; | |
426 | goto bail; | |
427 | } | |
428 | qp->s_num_rd_atomic++; | |
6700efdf BS |
429 | if (qp->s_lsn != (u32) -1) |
430 | qp->s_lsn++; | |
97f9efbc BS |
431 | wqe->lpsn = wqe->psn; |
432 | } | |
3859e39d RC |
433 | if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP) { |
434 | qp->s_state = OP(COMPARE_SWAP); | |
435 | ohdr->u.atomic_eth.swap_data = cpu_to_be64( | |
436 | wqe->wr.wr.atomic.swap); | |
437 | ohdr->u.atomic_eth.compare_data = cpu_to_be64( | |
438 | wqe->wr.wr.atomic.compare_add); | |
439 | } else { | |
440 | qp->s_state = OP(FETCH_ADD); | |
441 | ohdr->u.atomic_eth.swap_data = cpu_to_be64( | |
442 | wqe->wr.wr.atomic.compare_add); | |
443 | ohdr->u.atomic_eth.compare_data = 0; | |
444 | } | |
445 | ohdr->u.atomic_eth.vaddr[0] = cpu_to_be32( | |
446 | wqe->wr.wr.atomic.remote_addr >> 32); | |
447 | ohdr->u.atomic_eth.vaddr[1] = cpu_to_be32( | |
448 | wqe->wr.wr.atomic.remote_addr); | |
449 | ohdr->u.atomic_eth.rkey = cpu_to_be32( | |
450 | wqe->wr.wr.atomic.rkey); | |
451 | hwords += sizeof(struct ib_atomic_eth) / sizeof(u32); | |
97f9efbc BS |
452 | ss = NULL; |
453 | len = 0; | |
3859e39d RC |
454 | if (++qp->s_cur == qp->s_size) |
455 | qp->s_cur = 0; | |
97f9efbc BS |
456 | break; |
457 | ||
458 | default: | |
3859e39d | 459 | goto bail; |
97f9efbc | 460 | } |
13b18c86 RC |
461 | qp->s_sge.sge = wqe->sg_list[0]; |
462 | qp->s_sge.sg_list = wqe->sg_list + 1; | |
463 | qp->s_sge.num_sge = wqe->wr.num_sge; | |
464 | qp->s_len = wqe->length; | |
97f9efbc BS |
465 | if (newreq) { |
466 | qp->s_tail++; | |
467 | if (qp->s_tail >= qp->s_size) | |
468 | qp->s_tail = 0; | |
469 | } | |
13b18c86 RC |
470 | bth2 |= qp->s_psn & IPATH_PSN_MASK; |
471 | if (wqe->wr.opcode == IB_WR_RDMA_READ) | |
472 | qp->s_psn = wqe->lpsn + 1; | |
473 | else { | |
474 | qp->s_psn++; | |
6f5c4074 | 475 | if (ipath_cmp24(qp->s_psn, qp->s_next_psn) > 0) |
13b18c86 RC |
476 | qp->s_next_psn = qp->s_psn; |
477 | } | |
12eef41f BS |
478 | /* |
479 | * Put the QP on the pending list so lost ACKs will cause | |
480 | * a retry. More than one request can be pending so the | |
481 | * QP may already be on the dev->pending list. | |
482 | */ | |
97f9efbc | 483 | spin_lock(&dev->pending_lock); |
94b8d9f9 | 484 | if (list_empty(&qp->timerwait)) |
97f9efbc BS |
485 | list_add_tail(&qp->timerwait, |
486 | &dev->pending[dev->pending_index]); | |
487 | spin_unlock(&dev->pending_lock); | |
488 | break; | |
489 | ||
490 | case OP(RDMA_READ_RESPONSE_FIRST): | |
491 | /* | |
12eef41f BS |
492 | * This case can only happen if a send is restarted. |
493 | * See ipath_restart_rc(). | |
97f9efbc BS |
494 | */ |
495 | ipath_init_restart(qp, wqe); | |
496 | /* FALLTHROUGH */ | |
497 | case OP(SEND_FIRST): | |
498 | qp->s_state = OP(SEND_MIDDLE); | |
499 | /* FALLTHROUGH */ | |
500 | case OP(SEND_MIDDLE): | |
27b678dd | 501 | bth2 = qp->s_psn++ & IPATH_PSN_MASK; |
6f5c4074 | 502 | if (ipath_cmp24(qp->s_psn, qp->s_next_psn) > 0) |
97f9efbc BS |
503 | qp->s_next_psn = qp->s_psn; |
504 | ss = &qp->s_sge; | |
505 | len = qp->s_len; | |
506 | if (len > pmtu) { | |
97f9efbc BS |
507 | len = pmtu; |
508 | break; | |
509 | } | |
510 | if (wqe->wr.opcode == IB_WR_SEND) | |
511 | qp->s_state = OP(SEND_LAST); | |
512 | else { | |
513 | qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE); | |
514 | /* Immediate data comes after the BTH */ | |
0f39cf3d | 515 | ohdr->u.imm_data = wqe->wr.ex.imm_data; |
97f9efbc BS |
516 | hwords += 1; |
517 | } | |
518 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
519 | bth0 |= 1 << 23; | |
520 | bth2 |= 1 << 31; /* Request ACK. */ | |
521 | qp->s_cur++; | |
522 | if (qp->s_cur >= qp->s_size) | |
523 | qp->s_cur = 0; | |
524 | break; | |
525 | ||
526 | case OP(RDMA_READ_RESPONSE_LAST): | |
527 | /* | |
528 | * This case can only happen if a RDMA write is restarted. | |
529 | * See ipath_restart_rc(). | |
530 | */ | |
531 | ipath_init_restart(qp, wqe); | |
532 | /* FALLTHROUGH */ | |
533 | case OP(RDMA_WRITE_FIRST): | |
534 | qp->s_state = OP(RDMA_WRITE_MIDDLE); | |
535 | /* FALLTHROUGH */ | |
536 | case OP(RDMA_WRITE_MIDDLE): | |
27b678dd | 537 | bth2 = qp->s_psn++ & IPATH_PSN_MASK; |
6f5c4074 | 538 | if (ipath_cmp24(qp->s_psn, qp->s_next_psn) > 0) |
97f9efbc BS |
539 | qp->s_next_psn = qp->s_psn; |
540 | ss = &qp->s_sge; | |
541 | len = qp->s_len; | |
542 | if (len > pmtu) { | |
97f9efbc BS |
543 | len = pmtu; |
544 | break; | |
545 | } | |
546 | if (wqe->wr.opcode == IB_WR_RDMA_WRITE) | |
547 | qp->s_state = OP(RDMA_WRITE_LAST); | |
548 | else { | |
549 | qp->s_state = OP(RDMA_WRITE_LAST_WITH_IMMEDIATE); | |
550 | /* Immediate data comes after the BTH */ | |
0f39cf3d | 551 | ohdr->u.imm_data = wqe->wr.ex.imm_data; |
97f9efbc BS |
552 | hwords += 1; |
553 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
554 | bth0 |= 1 << 23; | |
555 | } | |
556 | bth2 |= 1 << 31; /* Request ACK. */ | |
557 | qp->s_cur++; | |
558 | if (qp->s_cur >= qp->s_size) | |
559 | qp->s_cur = 0; | |
560 | break; | |
561 | ||
562 | case OP(RDMA_READ_RESPONSE_MIDDLE): | |
563 | /* | |
564 | * This case can only happen if a RDMA read is restarted. | |
565 | * See ipath_restart_rc(). | |
566 | */ | |
567 | ipath_init_restart(qp, wqe); | |
27b678dd | 568 | len = ((qp->s_psn - wqe->psn) & IPATH_PSN_MASK) * pmtu; |
97f9efbc BS |
569 | ohdr->u.rc.reth.vaddr = |
570 | cpu_to_be64(wqe->wr.wr.rdma.remote_addr + len); | |
571 | ohdr->u.rc.reth.rkey = | |
572 | cpu_to_be32(wqe->wr.wr.rdma.rkey); | |
573 | ohdr->u.rc.reth.length = cpu_to_be32(qp->s_len); | |
574 | qp->s_state = OP(RDMA_READ_REQUEST); | |
3859e39d | 575 | hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32); |
27b678dd | 576 | bth2 = qp->s_psn++ & IPATH_PSN_MASK; |
6f5c4074 | 577 | if (ipath_cmp24(qp->s_psn, qp->s_next_psn) > 0) |
97f9efbc BS |
578 | qp->s_next_psn = qp->s_psn; |
579 | ss = NULL; | |
580 | len = 0; | |
581 | qp->s_cur++; | |
582 | if (qp->s_cur == qp->s_size) | |
583 | qp->s_cur = 0; | |
584 | break; | |
97f9efbc | 585 | } |
6022943e BS |
586 | if (ipath_cmp24(qp->s_psn, qp->s_last_psn + IPATH_PSN_CREDIT - 1) >= 0) |
587 | bth2 |= 1 << 31; /* Request ACK. */ | |
97f9efbc BS |
588 | qp->s_len -= len; |
589 | qp->s_hdrwords = hwords; | |
590 | qp->s_cur_sge = ss; | |
591 | qp->s_cur_size = len; | |
4ee97180 | 592 | ipath_make_ruc_header(dev, qp, ohdr, bth0 | (qp->s_state << 24), bth2); |
3859e39d | 593 | done: |
4ee97180 | 594 | ret = 1; |
e509be89 RC |
595 | goto unlock; |
596 | ||
3859e39d | 597 | bail: |
e509be89 RC |
598 | qp->s_flags &= ~IPATH_S_BUSY; |
599 | unlock: | |
4ee97180 RC |
600 | spin_unlock_irqrestore(&qp->s_lock, flags); |
601 | return ret; | |
97f9efbc BS |
602 | } |
603 | ||
97f9efbc | 604 | /** |
ddd4bb22 BS |
605 | * send_rc_ack - Construct an ACK packet and send it |
606 | * @qp: a pointer to the QP | |
97f9efbc | 607 | * |
ddd4bb22 BS |
608 | * This is called from ipath_rc_rcv() and only uses the receive |
609 | * side QP state. | |
3859e39d RC |
610 | * Note that RDMA reads and atomics are handled in the |
611 | * send side QP state and tasklet. | |
97f9efbc | 612 | */ |
97f9efbc BS |
613 | static void send_rc_ack(struct ipath_qp *qp) |
614 | { | |
615 | struct ipath_ibdev *dev = to_idev(qp->ibqp.device); | |
d98b1937 | 616 | struct ipath_devdata *dd; |
97f9efbc BS |
617 | u16 lrh0; |
618 | u32 bth0; | |
ddd4bb22 | 619 | u32 hwords; |
d98b1937 | 620 | u32 __iomem *piobuf; |
ddd4bb22 | 621 | struct ipath_ib_header hdr; |
97f9efbc | 622 | struct ipath_other_headers *ohdr; |
35ff032e | 623 | unsigned long flags; |
97f9efbc | 624 | |
d98b1937 RC |
625 | spin_lock_irqsave(&qp->s_lock, flags); |
626 | ||
3859e39d | 627 | /* Don't send ACK or NAK if a RDMA read or atomic is pending. */ |
154257f3 RC |
628 | if (qp->r_head_ack_queue != qp->s_tail_ack_queue || |
629 | (qp->s_flags & IPATH_S_ACK_PENDING) || | |
630 | qp->s_ack_state != OP(ACKNOWLEDGE)) | |
3859e39d RC |
631 | goto queue_ack; |
632 | ||
d98b1937 RC |
633 | spin_unlock_irqrestore(&qp->s_lock, flags); |
634 | ||
e509be89 | 635 | /* Don't try to send ACKs if the link isn't ACTIVE */ |
d98b1937 | 636 | dd = dev->dd; |
e509be89 RC |
637 | if (!(dd->ipath_flags & IPATH_LINKACTIVE)) |
638 | goto done; | |
639 | ||
d98b1937 RC |
640 | piobuf = ipath_getpiobuf(dd, 0, NULL); |
641 | if (!piobuf) { | |
642 | /* | |
643 | * We are out of PIO buffers at the moment. | |
644 | * Pass responsibility for sending the ACK to the | |
645 | * send tasklet so that when a PIO buffer becomes | |
646 | * available, the ACK is sent ahead of other outgoing | |
647 | * packets. | |
648 | */ | |
649 | spin_lock_irqsave(&qp->s_lock, flags); | |
650 | goto queue_ack; | |
651 | } | |
652 | ||
97f9efbc | 653 | /* Construct the header. */ |
ddd4bb22 | 654 | ohdr = &hdr.u.oth; |
27b678dd | 655 | lrh0 = IPATH_LRH_BTH; |
97f9efbc | 656 | /* header size in 32-bit words LRH+BTH+AETH = (8+12+4)/4. */ |
ddd4bb22 | 657 | hwords = 6; |
97f9efbc | 658 | if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) { |
ddd4bb22 BS |
659 | hwords += ipath_make_grh(dev, &hdr.u.l.grh, |
660 | &qp->remote_ah_attr.grh, | |
661 | hwords, 0); | |
662 | ohdr = &hdr.u.l.oth; | |
27b678dd | 663 | lrh0 = IPATH_LRH_GRH; |
97f9efbc | 664 | } |
12eef41f | 665 | /* read pkey_index w/o lock (its atomic) */ |
d98b1937 | 666 | bth0 = ipath_get_pkey(dd, qp->s_pkey_index) | |
1dd6a1be | 667 | (OP(ACKNOWLEDGE) << 24) | (1 << 22); |
12eef41f | 668 | if (qp->r_nak_state) |
27b678dd | 669 | ohdr->u.aeth = cpu_to_be32((qp->r_msn & IPATH_MSN_MASK) | |
12eef41f | 670 | (qp->r_nak_state << |
27b678dd | 671 | IPATH_AETH_CREDIT_SHIFT)); |
12eef41f BS |
672 | else |
673 | ohdr->u.aeth = ipath_compute_aeth(qp); | |
97f9efbc | 674 | lrh0 |= qp->remote_ah_attr.sl << 4; |
ddd4bb22 BS |
675 | hdr.lrh[0] = cpu_to_be16(lrh0); |
676 | hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); | |
677 | hdr.lrh[2] = cpu_to_be16(hwords + SIZE_OF_CRC); | |
94035896 RC |
678 | hdr.lrh[3] = cpu_to_be16(dd->ipath_lid | |
679 | qp->remote_ah_attr.src_path_bits); | |
97f9efbc BS |
680 | ohdr->bth[0] = cpu_to_be32(bth0); |
681 | ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); | |
27b678dd | 682 | ohdr->bth[2] = cpu_to_be32(qp->r_ack_psn & IPATH_PSN_MASK); |
97f9efbc | 683 | |
d98b1937 | 684 | writeq(hwords + 1, piobuf); |
3859e39d | 685 | |
d98b1937 RC |
686 | if (dd->ipath_flags & IPATH_PIO_FLUSH_WC) { |
687 | u32 *hdrp = (u32 *) &hdr; | |
688 | ||
689 | ipath_flush_wc(); | |
690 | __iowrite32_copy(piobuf + 2, hdrp, hwords - 1); | |
691 | ipath_flush_wc(); | |
692 | __raw_writel(hdrp[hwords - 1], piobuf + hwords + 1); | |
693 | } else | |
694 | __iowrite32_copy(piobuf + 2, (u32 *) &hdr, hwords); | |
695 | ||
696 | ipath_flush_wc(); | |
697 | ||
698 | dev->n_unicast_xmit++; | |
699 | goto done; | |
3859e39d RC |
700 | |
701 | queue_ack: | |
e509be89 RC |
702 | if (ib_ipath_state_ops[qp->state] & IPATH_PROCESS_RECV_OK) { |
703 | dev->n_rc_qacks++; | |
704 | qp->s_flags |= IPATH_S_ACK_PENDING; | |
705 | qp->s_nak_state = qp->r_nak_state; | |
706 | qp->s_ack_psn = qp->r_ack_psn; | |
707 | ||
708 | /* Schedule the send tasklet. */ | |
709 | ipath_schedule_send(qp); | |
710 | } | |
35ff032e | 711 | spin_unlock_irqrestore(&qp->s_lock, flags); |
3859e39d RC |
712 | done: |
713 | return; | |
97f9efbc BS |
714 | } |
715 | ||
6700efdf BS |
716 | /** |
717 | * reset_psn - reset the QP state to send starting from PSN | |
718 | * @qp: the QP | |
719 | * @psn: the packet sequence number to restart at | |
720 | * | |
721 | * This is called from ipath_rc_rcv() to process an incoming RC ACK | |
722 | * for the given QP. | |
723 | * Called at interrupt level with the QP s_lock held. | |
724 | */ | |
725 | static void reset_psn(struct ipath_qp *qp, u32 psn) | |
726 | { | |
727 | u32 n = qp->s_last; | |
728 | struct ipath_swqe *wqe = get_swqe_ptr(qp, n); | |
729 | u32 opcode; | |
730 | ||
731 | qp->s_cur = n; | |
732 | ||
733 | /* | |
734 | * If we are starting the request from the beginning, | |
735 | * let the normal send code handle initialization. | |
736 | */ | |
737 | if (ipath_cmp24(psn, wqe->psn) <= 0) { | |
738 | qp->s_state = OP(SEND_LAST); | |
739 | goto done; | |
740 | } | |
741 | ||
742 | /* Find the work request opcode corresponding to the given PSN. */ | |
743 | opcode = wqe->wr.opcode; | |
744 | for (;;) { | |
745 | int diff; | |
746 | ||
747 | if (++n == qp->s_size) | |
748 | n = 0; | |
749 | if (n == qp->s_tail) | |
750 | break; | |
751 | wqe = get_swqe_ptr(qp, n); | |
752 | diff = ipath_cmp24(psn, wqe->psn); | |
753 | if (diff < 0) | |
754 | break; | |
755 | qp->s_cur = n; | |
756 | /* | |
757 | * If we are starting the request from the beginning, | |
758 | * let the normal send code handle initialization. | |
759 | */ | |
760 | if (diff == 0) { | |
761 | qp->s_state = OP(SEND_LAST); | |
762 | goto done; | |
763 | } | |
764 | opcode = wqe->wr.opcode; | |
765 | } | |
766 | ||
767 | /* | |
768 | * Set the state to restart in the middle of a request. | |
769 | * Don't change the s_sge, s_cur_sge, or s_cur_size. | |
e509be89 | 770 | * See ipath_make_rc_req(). |
6700efdf BS |
771 | */ |
772 | switch (opcode) { | |
773 | case IB_WR_SEND: | |
774 | case IB_WR_SEND_WITH_IMM: | |
775 | qp->s_state = OP(RDMA_READ_RESPONSE_FIRST); | |
776 | break; | |
777 | ||
778 | case IB_WR_RDMA_WRITE: | |
779 | case IB_WR_RDMA_WRITE_WITH_IMM: | |
780 | qp->s_state = OP(RDMA_READ_RESPONSE_LAST); | |
781 | break; | |
782 | ||
783 | case IB_WR_RDMA_READ: | |
784 | qp->s_state = OP(RDMA_READ_RESPONSE_MIDDLE); | |
785 | break; | |
786 | ||
787 | default: | |
788 | /* | |
789 | * This case shouldn't happen since its only | |
790 | * one PSN per req. | |
791 | */ | |
792 | qp->s_state = OP(SEND_LAST); | |
793 | } | |
794 | done: | |
795 | qp->s_psn = psn; | |
796 | } | |
797 | ||
97f9efbc BS |
798 | /** |
799 | * ipath_restart_rc - back up requester to resend the last un-ACKed request | |
800 | * @qp: the QP to restart | |
801 | * @psn: packet sequence number for the request | |
802 | * @wc: the work completion request | |
803 | * | |
12eef41f | 804 | * The QP s_lock should be held and interrupts disabled. |
97f9efbc | 805 | */ |
53dc1ca1 | 806 | void ipath_restart_rc(struct ipath_qp *qp, u32 psn) |
97f9efbc BS |
807 | { |
808 | struct ipath_swqe *wqe = get_swqe_ptr(qp, qp->s_last); | |
809 | struct ipath_ibdev *dev; | |
97f9efbc | 810 | |
97f9efbc | 811 | if (qp->s_retry == 0) { |
53dc1ca1 RC |
812 | ipath_send_complete(qp, wqe, IB_WC_RETRY_EXC_ERR); |
813 | ipath_error_qp(qp, IB_WC_WR_FLUSH_ERR); | |
97f9efbc BS |
814 | goto bail; |
815 | } | |
816 | qp->s_retry--; | |
817 | ||
818 | /* | |
819 | * Remove the QP from the timeout queue. | |
820 | * Note: it may already have been removed by ipath_ib_timer(). | |
821 | */ | |
822 | dev = to_idev(qp->ibqp.device); | |
823 | spin_lock(&dev->pending_lock); | |
94b8d9f9 BS |
824 | if (!list_empty(&qp->timerwait)) |
825 | list_del_init(&qp->timerwait); | |
53dc1ca1 RC |
826 | if (!list_empty(&qp->piowait)) |
827 | list_del_init(&qp->piowait); | |
97f9efbc BS |
828 | spin_unlock(&dev->pending_lock); |
829 | ||
830 | if (wqe->wr.opcode == IB_WR_RDMA_READ) | |
831 | dev->n_rc_resends++; | |
832 | else | |
6f5c4074 | 833 | dev->n_rc_resends += (qp->s_psn - psn) & IPATH_PSN_MASK; |
97f9efbc | 834 | |
6700efdf | 835 | reset_psn(qp, psn); |
e509be89 | 836 | ipath_schedule_send(qp); |
97f9efbc BS |
837 | |
838 | bail: | |
839 | return; | |
840 | } | |
841 | ||
6022943e BS |
842 | static inline void update_last_psn(struct ipath_qp *qp, u32 psn) |
843 | { | |
e509be89 | 844 | qp->s_last_psn = psn; |
6022943e BS |
845 | } |
846 | ||
97f9efbc BS |
847 | /** |
848 | * do_rc_ack - process an incoming RC ACK | |
849 | * @qp: the QP the ACK came in on | |
850 | * @psn: the packet sequence number of the ACK | |
851 | * @opcode: the opcode of the request that resulted in the ACK | |
852 | * | |
6700efdf | 853 | * This is called from ipath_rc_rcv_resp() to process an incoming RC ACK |
97f9efbc | 854 | * for the given QP. |
12eef41f | 855 | * Called at interrupt level with the QP s_lock held and interrupts disabled. |
97f9efbc BS |
856 | * Returns 1 if OK, 0 if current operation should be aborted (NAK). |
857 | */ | |
06ee1090 RC |
858 | static int do_rc_ack(struct ipath_qp *qp, u32 aeth, u32 psn, int opcode, |
859 | u64 val) | |
97f9efbc BS |
860 | { |
861 | struct ipath_ibdev *dev = to_idev(qp->ibqp.device); | |
862 | struct ib_wc wc; | |
53dc1ca1 | 863 | enum ib_wc_status status; |
97f9efbc BS |
864 | struct ipath_swqe *wqe; |
865 | int ret = 0; | |
13b18c86 | 866 | u32 ack_psn; |
06ee1090 | 867 | int diff; |
97f9efbc BS |
868 | |
869 | /* | |
870 | * Remove the QP from the timeout queue (or RNR timeout queue). | |
871 | * If ipath_ib_timer() has already removed it, | |
872 | * it's OK since we hold the QP s_lock and ipath_restart_rc() | |
873 | * just won't find anything to restart if we ACK everything. | |
874 | */ | |
875 | spin_lock(&dev->pending_lock); | |
94b8d9f9 BS |
876 | if (!list_empty(&qp->timerwait)) |
877 | list_del_init(&qp->timerwait); | |
97f9efbc BS |
878 | spin_unlock(&dev->pending_lock); |
879 | ||
880 | /* | |
881 | * Note that NAKs implicitly ACK outstanding SEND and RDMA write | |
882 | * requests and implicitly NAK RDMA read and atomic requests issued | |
883 | * before the NAK'ed request. The MSN won't include the NAK'ed | |
884 | * request but will include an ACK'ed request(s). | |
885 | */ | |
13b18c86 RC |
886 | ack_psn = psn; |
887 | if (aeth >> 29) | |
888 | ack_psn--; | |
97f9efbc BS |
889 | wqe = get_swqe_ptr(qp, qp->s_last); |
890 | ||
97f9efbc BS |
891 | /* |
892 | * The MSN might be for a later WQE than the PSN indicates so | |
893 | * only complete WQEs that the PSN finishes. | |
894 | */ | |
06ee1090 RC |
895 | while ((diff = ipath_cmp24(ack_psn, wqe->lpsn)) >= 0) { |
896 | /* | |
897 | * RDMA_READ_RESPONSE_ONLY is a special case since | |
898 | * we want to generate completion events for everything | |
899 | * before the RDMA read, copy the data, then generate | |
900 | * the completion for the read. | |
901 | */ | |
902 | if (wqe->wr.opcode == IB_WR_RDMA_READ && | |
903 | opcode == OP(RDMA_READ_RESPONSE_ONLY) && | |
904 | diff == 0) { | |
905 | ret = 1; | |
906 | goto bail; | |
907 | } | |
97f9efbc BS |
908 | /* |
909 | * If this request is a RDMA read or atomic, and the ACK is | |
910 | * for a later operation, this ACK NAKs the RDMA read or | |
911 | * atomic. In other words, only a RDMA_READ_LAST or ONLY | |
912 | * can ACK a RDMA read and likewise for atomic ops. Note | |
913 | * that the NAK case can only happen if relaxed ordering is | |
914 | * used and requests are sent after an RDMA read or atomic | |
915 | * is sent but before the response is received. | |
916 | */ | |
917 | if ((wqe->wr.opcode == IB_WR_RDMA_READ && | |
06ee1090 | 918 | (opcode != OP(RDMA_READ_RESPONSE_LAST) || diff != 0)) || |
97f9efbc BS |
919 | ((wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || |
920 | wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) && | |
06ee1090 | 921 | (opcode != OP(ATOMIC_ACKNOWLEDGE) || diff != 0))) { |
97f9efbc BS |
922 | /* |
923 | * The last valid PSN seen is the previous | |
924 | * request's. | |
925 | */ | |
6022943e | 926 | update_last_psn(qp, wqe->psn - 1); |
97f9efbc | 927 | /* Retry this request. */ |
53dc1ca1 | 928 | ipath_restart_rc(qp, wqe->psn); |
97f9efbc BS |
929 | /* |
930 | * No need to process the ACK/NAK since we are | |
931 | * restarting an earlier request. | |
932 | */ | |
933 | goto bail; | |
934 | } | |
06ee1090 RC |
935 | if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || |
936 | wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) | |
937 | *(u64 *) wqe->sg_list[0].vaddr = val; | |
3859e39d RC |
938 | if (qp->s_num_rd_atomic && |
939 | (wqe->wr.opcode == IB_WR_RDMA_READ || | |
940 | wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || | |
941 | wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD)) { | |
942 | qp->s_num_rd_atomic--; | |
943 | /* Restart sending task if fence is complete */ | |
e509be89 RC |
944 | if (((qp->s_flags & IPATH_S_FENCE_PENDING) && |
945 | !qp->s_num_rd_atomic) || | |
946 | qp->s_flags & IPATH_S_RDMAR_PENDING) | |
947 | ipath_schedule_send(qp); | |
3859e39d | 948 | } |
97f9efbc | 949 | /* Post a send completion queue entry if requested. */ |
3859e39d | 950 | if (!(qp->s_flags & IPATH_S_SIGNAL_REQ_WR) || |
97f9efbc | 951 | (wqe->wr.send_flags & IB_SEND_SIGNALED)) { |
53dc1ca1 | 952 | memset(&wc, 0, sizeof wc); |
97f9efbc BS |
953 | wc.wr_id = wqe->wr.wr_id; |
954 | wc.status = IB_WC_SUCCESS; | |
955 | wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode]; | |
97f9efbc | 956 | wc.byte_len = wqe->length; |
062dbb69 | 957 | wc.qp = &qp->ibqp; |
97f9efbc | 958 | wc.src_qp = qp->remote_qpn; |
97f9efbc BS |
959 | wc.slid = qp->remote_ah_attr.dlid; |
960 | wc.sl = qp->remote_ah_attr.sl; | |
97f9efbc BS |
961 | ipath_cq_enter(to_icq(qp->ibqp.send_cq), &wc, 0); |
962 | } | |
963 | qp->s_retry = qp->s_retry_cnt; | |
964 | /* | |
965 | * If we are completing a request which is in the process of | |
966 | * being resent, we can stop resending it since we know the | |
967 | * responder has already seen it. | |
968 | */ | |
969 | if (qp->s_last == qp->s_cur) { | |
970 | if (++qp->s_cur >= qp->s_size) | |
971 | qp->s_cur = 0; | |
6f5c4074 RC |
972 | qp->s_last = qp->s_cur; |
973 | if (qp->s_last == qp->s_tail) | |
974 | break; | |
97f9efbc BS |
975 | wqe = get_swqe_ptr(qp, qp->s_cur); |
976 | qp->s_state = OP(SEND_LAST); | |
977 | qp->s_psn = wqe->psn; | |
6f5c4074 RC |
978 | } else { |
979 | if (++qp->s_last >= qp->s_size) | |
980 | qp->s_last = 0; | |
e509be89 RC |
981 | if (qp->state == IB_QPS_SQD && qp->s_last == qp->s_cur) |
982 | qp->s_draining = 0; | |
6f5c4074 RC |
983 | if (qp->s_last == qp->s_tail) |
984 | break; | |
985 | wqe = get_swqe_ptr(qp, qp->s_last); | |
97f9efbc | 986 | } |
97f9efbc BS |
987 | } |
988 | ||
989 | switch (aeth >> 29) { | |
990 | case 0: /* ACK */ | |
991 | dev->n_rc_acks++; | |
992 | /* If this is a partial ACK, reset the retransmit timer. */ | |
993 | if (qp->s_last != qp->s_tail) { | |
994 | spin_lock(&dev->pending_lock); | |
f4ad1bcc RC |
995 | if (list_empty(&qp->timerwait)) |
996 | list_add_tail(&qp->timerwait, | |
997 | &dev->pending[dev->pending_index]); | |
97f9efbc | 998 | spin_unlock(&dev->pending_lock); |
6f5c4074 RC |
999 | /* |
1000 | * If we get a partial ACK for a resent operation, | |
1001 | * we can stop resending the earlier packets and | |
1002 | * continue with the next packet the receiver wants. | |
1003 | */ | |
1004 | if (ipath_cmp24(qp->s_psn, psn) <= 0) { | |
1005 | reset_psn(qp, psn + 1); | |
e509be89 | 1006 | ipath_schedule_send(qp); |
6f5c4074 RC |
1007 | } |
1008 | } else if (ipath_cmp24(qp->s_psn, psn) <= 0) { | |
1009 | qp->s_state = OP(SEND_LAST); | |
1010 | qp->s_psn = psn + 1; | |
97f9efbc BS |
1011 | } |
1012 | ipath_get_credit(qp, aeth); | |
1013 | qp->s_rnr_retry = qp->s_rnr_retry_cnt; | |
1014 | qp->s_retry = qp->s_retry_cnt; | |
6022943e | 1015 | update_last_psn(qp, psn); |
97f9efbc BS |
1016 | ret = 1; |
1017 | goto bail; | |
1018 | ||
1019 | case 1: /* RNR NAK */ | |
1020 | dev->n_rnr_naks++; | |
6f5c4074 RC |
1021 | if (qp->s_last == qp->s_tail) |
1022 | goto bail; | |
97f9efbc | 1023 | if (qp->s_rnr_retry == 0) { |
53dc1ca1 | 1024 | status = IB_WC_RNR_RETRY_EXC_ERR; |
97f9efbc BS |
1025 | goto class_b; |
1026 | } | |
1027 | if (qp->s_rnr_retry_cnt < 7) | |
1028 | qp->s_rnr_retry--; | |
97f9efbc | 1029 | |
6700efdf | 1030 | /* The last valid PSN is the previous PSN. */ |
6022943e | 1031 | update_last_psn(qp, psn - 1); |
97f9efbc | 1032 | |
6f5c4074 RC |
1033 | if (wqe->wr.opcode == IB_WR_RDMA_READ) |
1034 | dev->n_rc_resends++; | |
1035 | else | |
1036 | dev->n_rc_resends += | |
1037 | (qp->s_psn - psn) & IPATH_PSN_MASK; | |
97f9efbc | 1038 | |
6700efdf | 1039 | reset_psn(qp, psn); |
97f9efbc BS |
1040 | |
1041 | qp->s_rnr_timeout = | |
27b678dd BS |
1042 | ib_ipath_rnr_table[(aeth >> IPATH_AETH_CREDIT_SHIFT) & |
1043 | IPATH_AETH_CREDIT_MASK]; | |
97f9efbc | 1044 | ipath_insert_rnr_queue(qp); |
e509be89 | 1045 | ipath_schedule_send(qp); |
97f9efbc BS |
1046 | goto bail; |
1047 | ||
1048 | case 3: /* NAK */ | |
6f5c4074 RC |
1049 | if (qp->s_last == qp->s_tail) |
1050 | goto bail; | |
1051 | /* The last valid PSN is the previous PSN. */ | |
1052 | update_last_psn(qp, psn - 1); | |
27b678dd BS |
1053 | switch ((aeth >> IPATH_AETH_CREDIT_SHIFT) & |
1054 | IPATH_AETH_CREDIT_MASK) { | |
97f9efbc BS |
1055 | case 0: /* PSN sequence error */ |
1056 | dev->n_seq_naks++; | |
1057 | /* | |
6f5c4074 | 1058 | * Back up to the responder's expected PSN. |
97f9efbc BS |
1059 | * Note that we might get a NAK in the middle of an |
1060 | * RDMA READ response which terminates the RDMA | |
1061 | * READ. | |
1062 | */ | |
53dc1ca1 | 1063 | ipath_restart_rc(qp, psn); |
97f9efbc BS |
1064 | break; |
1065 | ||
1066 | case 1: /* Invalid Request */ | |
53dc1ca1 | 1067 | status = IB_WC_REM_INV_REQ_ERR; |
97f9efbc BS |
1068 | dev->n_other_naks++; |
1069 | goto class_b; | |
1070 | ||
1071 | case 2: /* Remote Access Error */ | |
53dc1ca1 | 1072 | status = IB_WC_REM_ACCESS_ERR; |
97f9efbc BS |
1073 | dev->n_other_naks++; |
1074 | goto class_b; | |
1075 | ||
1076 | case 3: /* Remote Operation Error */ | |
53dc1ca1 | 1077 | status = IB_WC_REM_OP_ERR; |
97f9efbc BS |
1078 | dev->n_other_naks++; |
1079 | class_b: | |
53dc1ca1 RC |
1080 | ipath_send_complete(qp, wqe, status); |
1081 | ipath_error_qp(qp, IB_WC_WR_FLUSH_ERR); | |
97f9efbc BS |
1082 | break; |
1083 | ||
1084 | default: | |
1085 | /* Ignore other reserved NAK error codes */ | |
1086 | goto reserved; | |
1087 | } | |
1088 | qp->s_rnr_retry = qp->s_rnr_retry_cnt; | |
1089 | goto bail; | |
1090 | ||
1091 | default: /* 2: reserved */ | |
1092 | reserved: | |
1093 | /* Ignore reserved NAK codes. */ | |
1094 | goto bail; | |
1095 | } | |
1096 | ||
1097 | bail: | |
1098 | return ret; | |
1099 | } | |
1100 | ||
1101 | /** | |
1102 | * ipath_rc_rcv_resp - process an incoming RC response packet | |
1103 | * @dev: the device this packet came in on | |
1104 | * @ohdr: the other headers for this packet | |
1105 | * @data: the packet data | |
1106 | * @tlen: the packet length | |
1107 | * @qp: the QP for this packet | |
1108 | * @opcode: the opcode for this packet | |
1109 | * @psn: the packet sequence number for this packet | |
1110 | * @hdrsize: the header length | |
1111 | * @pmtu: the path MTU | |
1112 | * @header_in_data: true if part of the header data is in the data buffer | |
1113 | * | |
1114 | * This is called from ipath_rc_rcv() to process an incoming RC response | |
1115 | * packet for the given QP. | |
1116 | * Called at interrupt level. | |
1117 | */ | |
1118 | static inline void ipath_rc_rcv_resp(struct ipath_ibdev *dev, | |
1119 | struct ipath_other_headers *ohdr, | |
1120 | void *data, u32 tlen, | |
1121 | struct ipath_qp *qp, | |
1122 | u32 opcode, | |
1123 | u32 psn, u32 hdrsize, u32 pmtu, | |
1124 | int header_in_data) | |
1125 | { | |
3859e39d | 1126 | struct ipath_swqe *wqe; |
53dc1ca1 | 1127 | enum ib_wc_status status; |
97f9efbc | 1128 | unsigned long flags; |
97f9efbc BS |
1129 | int diff; |
1130 | u32 pad; | |
1131 | u32 aeth; | |
06ee1090 | 1132 | u64 val; |
97f9efbc BS |
1133 | |
1134 | spin_lock_irqsave(&qp->s_lock, flags); | |
1135 | ||
e509be89 RC |
1136 | /* Double check we can process this now that we hold the s_lock. */ |
1137 | if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_RECV_OK)) | |
1138 | goto ack_done; | |
1139 | ||
97f9efbc BS |
1140 | /* Ignore invalid responses. */ |
1141 | if (ipath_cmp24(psn, qp->s_next_psn) >= 0) | |
1142 | goto ack_done; | |
1143 | ||
1144 | /* Ignore duplicate responses. */ | |
1145 | diff = ipath_cmp24(psn, qp->s_last_psn); | |
1146 | if (unlikely(diff <= 0)) { | |
1147 | /* Update credits for "ghost" ACKs */ | |
1148 | if (diff == 0 && opcode == OP(ACKNOWLEDGE)) { | |
1149 | if (!header_in_data) | |
1150 | aeth = be32_to_cpu(ohdr->u.aeth); | |
1151 | else { | |
1152 | aeth = be32_to_cpu(((__be32 *) data)[0]); | |
1153 | data += sizeof(__be32); | |
1154 | } | |
1155 | if ((aeth >> 29) == 0) | |
1156 | ipath_get_credit(qp, aeth); | |
1157 | } | |
1158 | goto ack_done; | |
1159 | } | |
1160 | ||
3859e39d RC |
1161 | if (unlikely(qp->s_last == qp->s_tail)) |
1162 | goto ack_done; | |
1163 | wqe = get_swqe_ptr(qp, qp->s_last); | |
53dc1ca1 | 1164 | status = IB_WC_SUCCESS; |
3859e39d | 1165 | |
97f9efbc BS |
1166 | switch (opcode) { |
1167 | case OP(ACKNOWLEDGE): | |
1168 | case OP(ATOMIC_ACKNOWLEDGE): | |
1169 | case OP(RDMA_READ_RESPONSE_FIRST): | |
1170 | if (!header_in_data) | |
1171 | aeth = be32_to_cpu(ohdr->u.aeth); | |
1172 | else { | |
1173 | aeth = be32_to_cpu(((__be32 *) data)[0]); | |
1174 | data += sizeof(__be32); | |
1175 | } | |
3859e39d | 1176 | if (opcode == OP(ATOMIC_ACKNOWLEDGE)) { |
3859e39d RC |
1177 | if (!header_in_data) { |
1178 | __be32 *p = ohdr->u.at.atomic_ack_eth; | |
1179 | ||
1180 | val = ((u64) be32_to_cpu(p[0]) << 32) | | |
1181 | be32_to_cpu(p[1]); | |
1182 | } else | |
1183 | val = be64_to_cpu(((__be64 *) data)[0]); | |
06ee1090 RC |
1184 | } else |
1185 | val = 0; | |
1186 | if (!do_rc_ack(qp, aeth, psn, opcode, val) || | |
97f9efbc BS |
1187 | opcode != OP(RDMA_READ_RESPONSE_FIRST)) |
1188 | goto ack_done; | |
1189 | hdrsize += 4; | |
06ee1090 | 1190 | wqe = get_swqe_ptr(qp, qp->s_last); |
3859e39d | 1191 | if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) |
dd5190b6 | 1192 | goto ack_op_err; |
74116f58 | 1193 | qp->r_flags &= ~IPATH_R_RDMAR_SEQ; |
97f9efbc | 1194 | /* |
3859e39d RC |
1195 | * If this is a response to a resent RDMA read, we |
1196 | * have to be careful to copy the data to the right | |
1197 | * location. | |
97f9efbc | 1198 | */ |
3859e39d RC |
1199 | qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge, |
1200 | wqe, psn, pmtu); | |
1201 | goto read_middle; | |
97f9efbc BS |
1202 | |
1203 | case OP(RDMA_READ_RESPONSE_MIDDLE): | |
1204 | /* no AETH, no ACK */ | |
1205 | if (unlikely(ipath_cmp24(psn, qp->s_last_psn + 1))) { | |
1206 | dev->n_rdma_seq++; | |
74116f58 RC |
1207 | if (qp->r_flags & IPATH_R_RDMAR_SEQ) |
1208 | goto ack_done; | |
1209 | qp->r_flags |= IPATH_R_RDMAR_SEQ; | |
53dc1ca1 | 1210 | ipath_restart_rc(qp, qp->s_last_psn + 1); |
97f9efbc BS |
1211 | goto ack_done; |
1212 | } | |
3859e39d | 1213 | if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) |
dd5190b6 | 1214 | goto ack_op_err; |
3859e39d | 1215 | read_middle: |
7bbb15ea | 1216 | if (unlikely(tlen != (hdrsize + pmtu + 4))) |
dd5190b6 | 1217 | goto ack_len_err; |
3859e39d | 1218 | if (unlikely(pmtu >= qp->s_rdma_read_len)) |
dd5190b6 | 1219 | goto ack_len_err; |
3859e39d | 1220 | |
7bbb15ea | 1221 | /* We got a response so update the timeout. */ |
7bbb15ea BS |
1222 | spin_lock(&dev->pending_lock); |
1223 | if (qp->s_rnr_timeout == 0 && !list_empty(&qp->timerwait)) | |
1224 | list_move_tail(&qp->timerwait, | |
1225 | &dev->pending[dev->pending_index]); | |
1226 | spin_unlock(&dev->pending_lock); | |
450bb387 PML |
1227 | |
1228 | if (opcode == OP(RDMA_READ_RESPONSE_MIDDLE)) | |
1229 | qp->s_retry = qp->s_retry_cnt; | |
1230 | ||
7bbb15ea | 1231 | /* |
6700efdf BS |
1232 | * Update the RDMA receive state but do the copy w/o |
1233 | * holding the locks and blocking interrupts. | |
7bbb15ea | 1234 | */ |
3859e39d | 1235 | qp->s_rdma_read_len -= pmtu; |
6022943e | 1236 | update_last_psn(qp, psn); |
7bbb15ea | 1237 | spin_unlock_irqrestore(&qp->s_lock, flags); |
3859e39d | 1238 | ipath_copy_sge(&qp->s_rdma_read_sge, data, pmtu); |
7bbb15ea | 1239 | goto bail; |
97f9efbc | 1240 | |
3859e39d | 1241 | case OP(RDMA_READ_RESPONSE_ONLY): |
06ee1090 RC |
1242 | if (!header_in_data) |
1243 | aeth = be32_to_cpu(ohdr->u.aeth); | |
1244 | else | |
1245 | aeth = be32_to_cpu(((__be32 *) data)[0]); | |
1246 | if (!do_rc_ack(qp, aeth, psn, opcode, 0)) | |
3859e39d | 1247 | goto ack_done; |
dd5190b6 RC |
1248 | /* Get the number of bytes the message was padded by. */ |
1249 | pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; | |
1250 | /* | |
1251 | * Check that the data size is >= 0 && <= pmtu. | |
1252 | * Remember to account for the AETH header (4) and | |
1253 | * ICRC (4). | |
1254 | */ | |
1255 | if (unlikely(tlen < (hdrsize + pad + 8))) | |
1256 | goto ack_len_err; | |
3859e39d RC |
1257 | /* |
1258 | * If this is a response to a resent RDMA read, we | |
1259 | * have to be careful to copy the data to the right | |
1260 | * location. | |
3859e39d | 1261 | */ |
06ee1090 | 1262 | wqe = get_swqe_ptr(qp, qp->s_last); |
3859e39d RC |
1263 | qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge, |
1264 | wqe, psn, pmtu); | |
1265 | goto read_last; | |
1266 | ||
97f9efbc BS |
1267 | case OP(RDMA_READ_RESPONSE_LAST): |
1268 | /* ACKs READ req. */ | |
1269 | if (unlikely(ipath_cmp24(psn, qp->s_last_psn + 1))) { | |
1270 | dev->n_rdma_seq++; | |
74116f58 RC |
1271 | if (qp->r_flags & IPATH_R_RDMAR_SEQ) |
1272 | goto ack_done; | |
1273 | qp->r_flags |= IPATH_R_RDMAR_SEQ; | |
53dc1ca1 | 1274 | ipath_restart_rc(qp, qp->s_last_psn + 1); |
97f9efbc BS |
1275 | goto ack_done; |
1276 | } | |
3859e39d | 1277 | if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) |
dd5190b6 RC |
1278 | goto ack_op_err; |
1279 | /* Get the number of bytes the message was padded by. */ | |
97f9efbc BS |
1280 | pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; |
1281 | /* | |
1282 | * Check that the data size is >= 1 && <= pmtu. | |
1283 | * Remember to account for the AETH header (4) and | |
1284 | * ICRC (4). | |
1285 | */ | |
dd5190b6 RC |
1286 | if (unlikely(tlen <= (hdrsize + pad + 8))) |
1287 | goto ack_len_err; | |
1288 | read_last: | |
97f9efbc | 1289 | tlen -= hdrsize + pad + 8; |
dd5190b6 RC |
1290 | if (unlikely(tlen != qp->s_rdma_read_len)) |
1291 | goto ack_len_err; | |
97f9efbc BS |
1292 | if (!header_in_data) |
1293 | aeth = be32_to_cpu(ohdr->u.aeth); | |
1294 | else { | |
1295 | aeth = be32_to_cpu(((__be32 *) data)[0]); | |
1296 | data += sizeof(__be32); | |
1297 | } | |
3859e39d | 1298 | ipath_copy_sge(&qp->s_rdma_read_sge, data, tlen); |
06ee1090 RC |
1299 | (void) do_rc_ack(qp, aeth, psn, |
1300 | OP(RDMA_READ_RESPONSE_LAST), 0); | |
97f9efbc BS |
1301 | goto ack_done; |
1302 | } | |
1303 | ||
dd5190b6 | 1304 | ack_op_err: |
53dc1ca1 | 1305 | status = IB_WC_LOC_QP_OP_ERR; |
dd5190b6 RC |
1306 | goto ack_err; |
1307 | ||
1308 | ack_len_err: | |
53dc1ca1 | 1309 | status = IB_WC_LOC_LEN_ERR; |
dd5190b6 | 1310 | ack_err: |
53dc1ca1 RC |
1311 | ipath_send_complete(qp, wqe, status); |
1312 | ipath_error_qp(qp, IB_WC_WR_FLUSH_ERR); | |
1313 | ack_done: | |
6ed89b95 | 1314 | spin_unlock_irqrestore(&qp->s_lock, flags); |
97f9efbc BS |
1315 | bail: |
1316 | return; | |
1317 | } | |
1318 | ||
1319 | /** | |
1320 | * ipath_rc_rcv_error - process an incoming duplicate or error RC packet | |
1321 | * @dev: the device this packet came in on | |
1322 | * @ohdr: the other headers for this packet | |
1323 | * @data: the packet data | |
1324 | * @qp: the QP for this packet | |
1325 | * @opcode: the opcode for this packet | |
1326 | * @psn: the packet sequence number for this packet | |
1327 | * @diff: the difference between the PSN and the expected PSN | |
1328 | * @header_in_data: true if part of the header data is in the data buffer | |
1329 | * | |
1330 | * This is called from ipath_rc_rcv() to process an unexpected | |
1331 | * incoming RC packet for the given QP. | |
1332 | * Called at interrupt level. | |
1333 | * Return 1 if no more processing is needed; otherwise return 0 to | |
3859e39d | 1334 | * schedule a response to be sent. |
97f9efbc BS |
1335 | */ |
1336 | static inline int ipath_rc_rcv_error(struct ipath_ibdev *dev, | |
1337 | struct ipath_other_headers *ohdr, | |
1338 | void *data, | |
1339 | struct ipath_qp *qp, | |
1340 | u32 opcode, | |
1341 | u32 psn, | |
1342 | int diff, | |
1343 | int header_in_data) | |
1344 | { | |
3859e39d RC |
1345 | struct ipath_ack_entry *e; |
1346 | u8 i, prev; | |
1347 | int old_req; | |
35ff032e | 1348 | unsigned long flags; |
97f9efbc BS |
1349 | |
1350 | if (diff > 0) { | |
1351 | /* | |
1352 | * Packet sequence error. | |
1353 | * A NAK will ACK earlier sends and RDMA writes. | |
3859e39d | 1354 | * Don't queue the NAK if we already sent one. |
97f9efbc | 1355 | */ |
3859e39d | 1356 | if (!qp->r_nak_state) { |
12eef41f BS |
1357 | qp->r_nak_state = IB_NAK_PSN_ERROR; |
1358 | /* Use the expected PSN. */ | |
1359 | qp->r_ack_psn = qp->r_psn; | |
3859e39d | 1360 | goto send_ack; |
97f9efbc | 1361 | } |
3859e39d | 1362 | goto done; |
97f9efbc BS |
1363 | } |
1364 | ||
1365 | /* | |
1366 | * Handle a duplicate request. Don't re-execute SEND, RDMA | |
1367 | * write or atomic op. Don't NAK errors, just silently drop | |
1368 | * the duplicate request. Note that r_sge, r_len, and | |
1369 | * r_rcv_len may be in use so don't modify them. | |
1370 | * | |
1371 | * We are supposed to ACK the earliest duplicate PSN but we | |
1372 | * can coalesce an outstanding duplicate ACK. We have to | |
1373 | * send the earliest so that RDMA reads can be restarted at | |
1374 | * the requester's expected PSN. | |
3859e39d RC |
1375 | * |
1376 | * First, find where this duplicate PSN falls within the | |
1377 | * ACKs previously sent. | |
97f9efbc | 1378 | */ |
3859e39d RC |
1379 | psn &= IPATH_PSN_MASK; |
1380 | e = NULL; | |
1381 | old_req = 1; | |
e509be89 | 1382 | |
35ff032e | 1383 | spin_lock_irqsave(&qp->s_lock, flags); |
e509be89 RC |
1384 | /* Double check we can process this now that we hold the s_lock. */ |
1385 | if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_RECV_OK)) | |
1386 | goto unlock_done; | |
1387 | ||
3859e39d RC |
1388 | for (i = qp->r_head_ack_queue; ; i = prev) { |
1389 | if (i == qp->s_tail_ack_queue) | |
1390 | old_req = 0; | |
1391 | if (i) | |
1392 | prev = i - 1; | |
1393 | else | |
1394 | prev = IPATH_MAX_RDMA_ATOMIC; | |
1395 | if (prev == qp->r_head_ack_queue) { | |
1396 | e = NULL; | |
1397 | break; | |
1398 | } | |
1399 | e = &qp->s_ack_queue[prev]; | |
1400 | if (!e->opcode) { | |
1401 | e = NULL; | |
1402 | break; | |
1403 | } | |
06ee1090 RC |
1404 | if (ipath_cmp24(psn, e->psn) >= 0) { |
1405 | if (prev == qp->s_tail_ack_queue) | |
1406 | old_req = 0; | |
3859e39d | 1407 | break; |
06ee1090 | 1408 | } |
3859e39d RC |
1409 | } |
1410 | switch (opcode) { | |
1411 | case OP(RDMA_READ_REQUEST): { | |
1412 | struct ib_reth *reth; | |
1413 | u32 offset; | |
1414 | u32 len; | |
1415 | ||
1416 | /* | |
1417 | * If we didn't find the RDMA read request in the ack queue, | |
1418 | * or the send tasklet is already backed up to send an | |
1419 | * earlier entry, we can ignore this request. | |
1420 | */ | |
1421 | if (!e || e->opcode != OP(RDMA_READ_REQUEST) || old_req) | |
1422 | goto unlock_done; | |
97f9efbc BS |
1423 | /* RETH comes after BTH */ |
1424 | if (!header_in_data) | |
1425 | reth = &ohdr->u.rc.reth; | |
1426 | else { | |
1427 | reth = (struct ib_reth *)data; | |
1428 | data += sizeof(*reth); | |
1429 | } | |
12eef41f | 1430 | /* |
3859e39d RC |
1431 | * Address range must be a subset of the original |
1432 | * request and start on pmtu boundaries. | |
1433 | * We reuse the old ack_queue slot since the requester | |
1434 | * should not back up and request an earlier PSN for the | |
1435 | * same request. | |
12eef41f | 1436 | */ |
3859e39d RC |
1437 | offset = ((psn - e->psn) & IPATH_PSN_MASK) * |
1438 | ib_mtu_enum_to_int(qp->path_mtu); | |
1439 | len = be32_to_cpu(reth->length); | |
1440 | if (unlikely(offset + len > e->rdma_sge.sge.sge_length)) | |
1441 | goto unlock_done; | |
1442 | if (len != 0) { | |
97f9efbc BS |
1443 | u32 rkey = be32_to_cpu(reth->rkey); |
1444 | u64 vaddr = be64_to_cpu(reth->vaddr); | |
1445 | int ok; | |
1446 | ||
3859e39d RC |
1447 | ok = ipath_rkey_ok(qp, &e->rdma_sge, |
1448 | len, vaddr, rkey, | |
97f9efbc | 1449 | IB_ACCESS_REMOTE_READ); |
3859e39d RC |
1450 | if (unlikely(!ok)) |
1451 | goto unlock_done; | |
97f9efbc | 1452 | } else { |
3859e39d RC |
1453 | e->rdma_sge.sg_list = NULL; |
1454 | e->rdma_sge.num_sge = 0; | |
1455 | e->rdma_sge.sge.mr = NULL; | |
1456 | e->rdma_sge.sge.vaddr = NULL; | |
1457 | e->rdma_sge.sge.length = 0; | |
1458 | e->rdma_sge.sge.sge_length = 0; | |
97f9efbc | 1459 | } |
3859e39d RC |
1460 | e->psn = psn; |
1461 | qp->s_ack_state = OP(ACKNOWLEDGE); | |
1462 | qp->s_tail_ack_queue = prev; | |
1463 | break; | |
12eef41f BS |
1464 | } |
1465 | ||
97f9efbc | 1466 | case OP(COMPARE_SWAP): |
3859e39d | 1467 | case OP(FETCH_ADD): { |
97f9efbc | 1468 | /* |
3859e39d RC |
1469 | * If we didn't find the atomic request in the ack queue |
1470 | * or the send tasklet is already backed up to send an | |
1471 | * earlier entry, we can ignore this request. | |
97f9efbc | 1472 | */ |
3859e39d RC |
1473 | if (!e || e->opcode != (u8) opcode || old_req) |
1474 | goto unlock_done; | |
1475 | qp->s_ack_state = OP(ACKNOWLEDGE); | |
1476 | qp->s_tail_ack_queue = prev; | |
1477 | break; | |
1478 | } | |
1479 | ||
1480 | default: | |
1481 | if (old_req) | |
1482 | goto unlock_done; | |
1483 | /* | |
1484 | * Resend the most recent ACK if this request is | |
1485 | * after all the previous RDMA reads and atomics. | |
1486 | */ | |
1487 | if (i == qp->r_head_ack_queue) { | |
35ff032e | 1488 | spin_unlock_irqrestore(&qp->s_lock, flags); |
3859e39d RC |
1489 | qp->r_nak_state = 0; |
1490 | qp->r_ack_psn = qp->r_psn - 1; | |
1491 | goto send_ack; | |
1492 | } | |
4ee97180 RC |
1493 | /* |
1494 | * Try to send a simple ACK to work around a Mellanox bug | |
1495 | * which doesn't accept a RDMA read response or atomic | |
1496 | * response as an ACK for earlier SENDs or RDMA writes. | |
1497 | */ | |
1498 | if (qp->r_head_ack_queue == qp->s_tail_ack_queue && | |
1499 | !(qp->s_flags & IPATH_S_ACK_PENDING) && | |
1500 | qp->s_ack_state == OP(ACKNOWLEDGE)) { | |
1501 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
1502 | qp->r_nak_state = 0; | |
1503 | qp->r_ack_psn = qp->s_ack_queue[i].psn - 1; | |
1504 | goto send_ack; | |
1505 | } | |
3859e39d RC |
1506 | /* |
1507 | * Resend the RDMA read or atomic op which | |
1508 | * ACKs this duplicate request. | |
1509 | */ | |
1510 | qp->s_ack_state = OP(ACKNOWLEDGE); | |
1511 | qp->s_tail_ack_queue = i; | |
97f9efbc BS |
1512 | break; |
1513 | } | |
12eef41f | 1514 | qp->r_nak_state = 0; |
e509be89 | 1515 | ipath_schedule_send(qp); |
97f9efbc | 1516 | |
3859e39d | 1517 | unlock_done: |
35ff032e | 1518 | spin_unlock_irqrestore(&qp->s_lock, flags); |
97f9efbc BS |
1519 | done: |
1520 | return 1; | |
3859e39d RC |
1521 | |
1522 | send_ack: | |
1523 | return 0; | |
97f9efbc BS |
1524 | } |
1525 | ||
53dc1ca1 | 1526 | void ipath_rc_error(struct ipath_qp *qp, enum ib_wc_status err) |
8d0208cb | 1527 | { |
35ff032e | 1528 | unsigned long flags; |
d42b01b5 | 1529 | int lastwqe; |
35ff032e RC |
1530 | |
1531 | spin_lock_irqsave(&qp->s_lock, flags); | |
d42b01b5 | 1532 | lastwqe = ipath_error_qp(qp, err); |
35ff032e | 1533 | spin_unlock_irqrestore(&qp->s_lock, flags); |
d42b01b5 RC |
1534 | |
1535 | if (lastwqe) { | |
1536 | struct ib_event ev; | |
1537 | ||
1538 | ev.device = qp->ibqp.device; | |
1539 | ev.element.qp = &qp->ibqp; | |
1540 | ev.event = IB_EVENT_QP_LAST_WQE_REACHED; | |
1541 | qp->ibqp.event_handler(&ev, qp->ibqp.qp_context); | |
1542 | } | |
8d0208cb BS |
1543 | } |
1544 | ||
d781b129 RC |
1545 | static inline void ipath_update_ack_queue(struct ipath_qp *qp, unsigned n) |
1546 | { | |
d781b129 RC |
1547 | unsigned next; |
1548 | ||
1549 | next = n + 1; | |
1550 | if (next > IPATH_MAX_RDMA_ATOMIC) | |
1551 | next = 0; | |
d781b129 RC |
1552 | if (n == qp->s_tail_ack_queue) { |
1553 | qp->s_tail_ack_queue = next; | |
1554 | qp->s_ack_state = OP(ACKNOWLEDGE); | |
1555 | } | |
d781b129 RC |
1556 | } |
1557 | ||
97f9efbc BS |
1558 | /** |
1559 | * ipath_rc_rcv - process an incoming RC packet | |
1560 | * @dev: the device this packet came in on | |
1561 | * @hdr: the header of this packet | |
1562 | * @has_grh: true if the header has a GRH | |
1563 | * @data: the packet data | |
1564 | * @tlen: the packet length | |
1565 | * @qp: the QP for this packet | |
1566 | * | |
1567 | * This is called from ipath_qp_rcv() to process an incoming RC packet | |
1568 | * for the given QP. | |
1569 | * Called at interrupt level. | |
1570 | */ | |
1571 | void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr, | |
1572 | int has_grh, void *data, u32 tlen, struct ipath_qp *qp) | |
1573 | { | |
1574 | struct ipath_other_headers *ohdr; | |
1575 | u32 opcode; | |
1576 | u32 hdrsize; | |
1577 | u32 psn; | |
1578 | u32 pad; | |
97f9efbc BS |
1579 | struct ib_wc wc; |
1580 | u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu); | |
1581 | int diff; | |
1582 | struct ib_reth *reth; | |
1583 | int header_in_data; | |
e509be89 | 1584 | unsigned long flags; |
97f9efbc | 1585 | |
10aeb0e6 BS |
1586 | /* Validate the SLID. See Ch. 9.6.1.5 */ |
1587 | if (unlikely(be16_to_cpu(hdr->lrh[3]) != qp->remote_ah_attr.dlid)) | |
1588 | goto done; | |
1589 | ||
97f9efbc BS |
1590 | /* Check for GRH */ |
1591 | if (!has_grh) { | |
1592 | ohdr = &hdr->u.oth; | |
1593 | hdrsize = 8 + 12; /* LRH + BTH */ | |
1594 | psn = be32_to_cpu(ohdr->bth[2]); | |
1595 | header_in_data = 0; | |
1596 | } else { | |
1597 | ohdr = &hdr->u.l.oth; | |
1598 | hdrsize = 8 + 40 + 12; /* LRH + GRH + BTH */ | |
1599 | /* | |
1600 | * The header with GRH is 60 bytes and the core driver sets | |
1601 | * the eager header buffer size to 56 bytes so the last 4 | |
1602 | * bytes of the BTH header (PSN) is in the data buffer. | |
1603 | */ | |
34b2aafe | 1604 | header_in_data = dev->dd->ipath_rcvhdrentsize == 16; |
97f9efbc BS |
1605 | if (header_in_data) { |
1606 | psn = be32_to_cpu(((__be32 *) data)[0]); | |
1607 | data += sizeof(__be32); | |
1608 | } else | |
1609 | psn = be32_to_cpu(ohdr->bth[2]); | |
1610 | } | |
97f9efbc BS |
1611 | |
1612 | /* | |
1613 | * Process responses (ACKs) before anything else. Note that the | |
1614 | * packet sequence number will be for something in the send work | |
1615 | * queue rather than the expected receive packet sequence number. | |
1616 | * In other words, this QP is the requester. | |
1617 | */ | |
ddd4bb22 | 1618 | opcode = be32_to_cpu(ohdr->bth[0]) >> 24; |
97f9efbc BS |
1619 | if (opcode >= OP(RDMA_READ_RESPONSE_FIRST) && |
1620 | opcode <= OP(ATOMIC_ACKNOWLEDGE)) { | |
1621 | ipath_rc_rcv_resp(dev, ohdr, data, tlen, qp, opcode, psn, | |
1622 | hdrsize, pmtu, header_in_data); | |
12eef41f | 1623 | goto done; |
97f9efbc BS |
1624 | } |
1625 | ||
97f9efbc BS |
1626 | /* Compute 24 bits worth of difference. */ |
1627 | diff = ipath_cmp24(psn, qp->r_psn); | |
1628 | if (unlikely(diff)) { | |
1629 | if (ipath_rc_rcv_error(dev, ohdr, data, qp, opcode, | |
1630 | psn, diff, header_in_data)) | |
1631 | goto done; | |
12eef41f | 1632 | goto send_ack; |
97f9efbc BS |
1633 | } |
1634 | ||
1635 | /* Check for opcode sequence errors. */ | |
1636 | switch (qp->r_state) { | |
1637 | case OP(SEND_FIRST): | |
1638 | case OP(SEND_MIDDLE): | |
1639 | if (opcode == OP(SEND_MIDDLE) || | |
1640 | opcode == OP(SEND_LAST) || | |
1641 | opcode == OP(SEND_LAST_WITH_IMMEDIATE)) | |
1642 | break; | |
53dc1ca1 | 1643 | goto nack_inv; |
97f9efbc BS |
1644 | |
1645 | case OP(RDMA_WRITE_FIRST): | |
1646 | case OP(RDMA_WRITE_MIDDLE): | |
1647 | if (opcode == OP(RDMA_WRITE_MIDDLE) || | |
1648 | opcode == OP(RDMA_WRITE_LAST) || | |
1649 | opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) | |
1650 | break; | |
1651 | goto nack_inv; | |
1652 | ||
97f9efbc BS |
1653 | default: |
1654 | if (opcode == OP(SEND_MIDDLE) || | |
1655 | opcode == OP(SEND_LAST) || | |
1656 | opcode == OP(SEND_LAST_WITH_IMMEDIATE) || | |
1657 | opcode == OP(RDMA_WRITE_MIDDLE) || | |
1658 | opcode == OP(RDMA_WRITE_LAST) || | |
1659 | opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) | |
1660 | goto nack_inv; | |
12eef41f BS |
1661 | /* |
1662 | * Note that it is up to the requester to not send a new | |
1663 | * RDMA read or atomic operation before receiving an ACK | |
1664 | * for the previous operation. | |
1665 | */ | |
97f9efbc BS |
1666 | break; |
1667 | } | |
1668 | ||
53dc1ca1 | 1669 | memset(&wc, 0, sizeof wc); |
97f9efbc BS |
1670 | |
1671 | /* OK, process the packet. */ | |
1672 | switch (opcode) { | |
1673 | case OP(SEND_FIRST): | |
53dc1ca1 RC |
1674 | if (!ipath_get_rwqe(qp, 0)) |
1675 | goto rnr_nak; | |
97f9efbc BS |
1676 | qp->r_rcv_len = 0; |
1677 | /* FALLTHROUGH */ | |
1678 | case OP(SEND_MIDDLE): | |
1679 | case OP(RDMA_WRITE_MIDDLE): | |
1680 | send_middle: | |
1681 | /* Check for invalid length PMTU or posted rwqe len. */ | |
1682 | if (unlikely(tlen != (hdrsize + pmtu + 4))) | |
1683 | goto nack_inv; | |
1684 | qp->r_rcv_len += pmtu; | |
1685 | if (unlikely(qp->r_rcv_len > qp->r_len)) | |
1686 | goto nack_inv; | |
1687 | ipath_copy_sge(&qp->r_sge, data, pmtu); | |
1688 | break; | |
1689 | ||
1690 | case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE): | |
1691 | /* consume RWQE */ | |
1692 | if (!ipath_get_rwqe(qp, 1)) | |
1693 | goto rnr_nak; | |
1694 | goto send_last_imm; | |
1695 | ||
1696 | case OP(SEND_ONLY): | |
1697 | case OP(SEND_ONLY_WITH_IMMEDIATE): | |
1698 | if (!ipath_get_rwqe(qp, 0)) | |
1699 | goto rnr_nak; | |
1700 | qp->r_rcv_len = 0; | |
1701 | if (opcode == OP(SEND_ONLY)) | |
1702 | goto send_last; | |
1703 | /* FALLTHROUGH */ | |
1704 | case OP(SEND_LAST_WITH_IMMEDIATE): | |
1705 | send_last_imm: | |
1706 | if (header_in_data) { | |
00f7ec36 | 1707 | wc.ex.imm_data = *(__be32 *) data; |
97f9efbc BS |
1708 | data += sizeof(__be32); |
1709 | } else { | |
1710 | /* Immediate data comes after BTH */ | |
00f7ec36 | 1711 | wc.ex.imm_data = ohdr->u.imm_data; |
97f9efbc BS |
1712 | } |
1713 | hdrsize += 4; | |
1714 | wc.wc_flags = IB_WC_WITH_IMM; | |
1715 | /* FALLTHROUGH */ | |
1716 | case OP(SEND_LAST): | |
1717 | case OP(RDMA_WRITE_LAST): | |
1718 | send_last: | |
1719 | /* Get the number of bytes the message was padded by. */ | |
1720 | pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; | |
1721 | /* Check for invalid length. */ | |
1722 | /* XXX LAST len should be >= 1 */ | |
1723 | if (unlikely(tlen < (hdrsize + pad + 4))) | |
1724 | goto nack_inv; | |
1725 | /* Don't count the CRC. */ | |
1726 | tlen -= (hdrsize + pad + 4); | |
1727 | wc.byte_len = tlen + qp->r_rcv_len; | |
1728 | if (unlikely(wc.byte_len > qp->r_len)) | |
1729 | goto nack_inv; | |
1730 | ipath_copy_sge(&qp->r_sge, data, tlen); | |
12eef41f | 1731 | qp->r_msn++; |
e509be89 | 1732 | if (!test_and_clear_bit(IPATH_R_WRID_VALID, &qp->r_aflags)) |
97f9efbc BS |
1733 | break; |
1734 | wc.wr_id = qp->r_wr_id; | |
1735 | wc.status = IB_WC_SUCCESS; | |
2bfc8e9e RC |
1736 | if (opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE) || |
1737 | opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) | |
1738 | wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; | |
1739 | else | |
1740 | wc.opcode = IB_WC_RECV; | |
062dbb69 | 1741 | wc.qp = &qp->ibqp; |
97f9efbc | 1742 | wc.src_qp = qp->remote_qpn; |
97f9efbc BS |
1743 | wc.slid = qp->remote_ah_attr.dlid; |
1744 | wc.sl = qp->remote_ah_attr.sl; | |
97f9efbc BS |
1745 | /* Signal completion event if the solicited bit is set. */ |
1746 | ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, | |
1747 | (ohdr->bth[0] & | |
1748 | __constant_cpu_to_be32(1 << 23)) != 0); | |
1749 | break; | |
1750 | ||
1751 | case OP(RDMA_WRITE_FIRST): | |
1752 | case OP(RDMA_WRITE_ONLY): | |
1753 | case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): | |
b506e1dc RW |
1754 | if (unlikely(!(qp->qp_access_flags & |
1755 | IB_ACCESS_REMOTE_WRITE))) | |
1756 | goto nack_inv; | |
97f9efbc BS |
1757 | /* consume RWQE */ |
1758 | /* RETH comes after BTH */ | |
1759 | if (!header_in_data) | |
1760 | reth = &ohdr->u.rc.reth; | |
1761 | else { | |
1762 | reth = (struct ib_reth *)data; | |
1763 | data += sizeof(*reth); | |
1764 | } | |
1765 | hdrsize += sizeof(*reth); | |
1766 | qp->r_len = be32_to_cpu(reth->length); | |
1767 | qp->r_rcv_len = 0; | |
1768 | if (qp->r_len != 0) { | |
1769 | u32 rkey = be32_to_cpu(reth->rkey); | |
1770 | u64 vaddr = be64_to_cpu(reth->vaddr); | |
1771 | int ok; | |
1772 | ||
1773 | /* Check rkey & NAK */ | |
6a553af2 | 1774 | ok = ipath_rkey_ok(qp, &qp->r_sge, |
97f9efbc BS |
1775 | qp->r_len, vaddr, rkey, |
1776 | IB_ACCESS_REMOTE_WRITE); | |
12eef41f BS |
1777 | if (unlikely(!ok)) |
1778 | goto nack_acc; | |
97f9efbc BS |
1779 | } else { |
1780 | qp->r_sge.sg_list = NULL; | |
1781 | qp->r_sge.sge.mr = NULL; | |
1782 | qp->r_sge.sge.vaddr = NULL; | |
1783 | qp->r_sge.sge.length = 0; | |
1784 | qp->r_sge.sge.sge_length = 0; | |
1785 | } | |
97f9efbc BS |
1786 | if (opcode == OP(RDMA_WRITE_FIRST)) |
1787 | goto send_middle; | |
1788 | else if (opcode == OP(RDMA_WRITE_ONLY)) | |
1789 | goto send_last; | |
1790 | if (!ipath_get_rwqe(qp, 1)) | |
1791 | goto rnr_nak; | |
1792 | goto send_last_imm; | |
1793 | ||
3859e39d RC |
1794 | case OP(RDMA_READ_REQUEST): { |
1795 | struct ipath_ack_entry *e; | |
1796 | u32 len; | |
1797 | u8 next; | |
1798 | ||
b506e1dc RW |
1799 | if (unlikely(!(qp->qp_access_flags & |
1800 | IB_ACCESS_REMOTE_READ))) | |
1801 | goto nack_inv; | |
3859e39d RC |
1802 | next = qp->r_head_ack_queue + 1; |
1803 | if (next > IPATH_MAX_RDMA_ATOMIC) | |
1804 | next = 0; | |
e509be89 RC |
1805 | spin_lock_irqsave(&qp->s_lock, flags); |
1806 | /* Double check we can process this while holding the s_lock. */ | |
1807 | if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_RECV_OK)) | |
1808 | goto unlock; | |
d781b129 RC |
1809 | if (unlikely(next == qp->s_tail_ack_queue)) { |
1810 | if (!qp->s_ack_queue[next].sent) | |
e509be89 | 1811 | goto nack_inv_unlck; |
d781b129 RC |
1812 | ipath_update_ack_queue(qp, next); |
1813 | } | |
3859e39d | 1814 | e = &qp->s_ack_queue[qp->r_head_ack_queue]; |
97f9efbc BS |
1815 | /* RETH comes after BTH */ |
1816 | if (!header_in_data) | |
1817 | reth = &ohdr->u.rc.reth; | |
1818 | else { | |
1819 | reth = (struct ib_reth *)data; | |
1820 | data += sizeof(*reth); | |
1821 | } | |
3859e39d RC |
1822 | len = be32_to_cpu(reth->length); |
1823 | if (len) { | |
97f9efbc BS |
1824 | u32 rkey = be32_to_cpu(reth->rkey); |
1825 | u64 vaddr = be64_to_cpu(reth->vaddr); | |
1826 | int ok; | |
1827 | ||
1828 | /* Check rkey & NAK */ | |
3859e39d RC |
1829 | ok = ipath_rkey_ok(qp, &e->rdma_sge, len, vaddr, |
1830 | rkey, IB_ACCESS_REMOTE_READ); | |
1831 | if (unlikely(!ok)) | |
e509be89 | 1832 | goto nack_acc_unlck; |
97f9efbc BS |
1833 | /* |
1834 | * Update the next expected PSN. We add 1 later | |
1835 | * below, so only add the remainder here. | |
1836 | */ | |
3859e39d RC |
1837 | if (len > pmtu) |
1838 | qp->r_psn += (len - 1) / pmtu; | |
97f9efbc | 1839 | } else { |
3859e39d RC |
1840 | e->rdma_sge.sg_list = NULL; |
1841 | e->rdma_sge.num_sge = 0; | |
1842 | e->rdma_sge.sge.mr = NULL; | |
1843 | e->rdma_sge.sge.vaddr = NULL; | |
1844 | e->rdma_sge.sge.length = 0; | |
1845 | e->rdma_sge.sge.sge_length = 0; | |
97f9efbc | 1846 | } |
3859e39d | 1847 | e->opcode = opcode; |
d781b129 | 1848 | e->sent = 0; |
3859e39d | 1849 | e->psn = psn; |
97f9efbc BS |
1850 | /* |
1851 | * We need to increment the MSN here instead of when we | |
1852 | * finish sending the result since a duplicate request would | |
1853 | * increment it more than once. | |
1854 | */ | |
12eef41f | 1855 | qp->r_msn++; |
97f9efbc BS |
1856 | qp->r_psn++; |
1857 | qp->r_state = opcode; | |
12eef41f | 1858 | qp->r_nak_state = 0; |
3859e39d | 1859 | qp->r_head_ack_queue = next; |
12eef41f | 1860 | |
e509be89 RC |
1861 | /* Schedule the send tasklet. */ |
1862 | ipath_schedule_send(qp); | |
12eef41f | 1863 | |
e509be89 | 1864 | goto unlock; |
3859e39d | 1865 | } |
97f9efbc BS |
1866 | |
1867 | case OP(COMPARE_SWAP): | |
1868 | case OP(FETCH_ADD): { | |
1869 | struct ib_atomic_eth *ateth; | |
3859e39d | 1870 | struct ipath_ack_entry *e; |
97f9efbc | 1871 | u64 vaddr; |
3859e39d | 1872 | atomic64_t *maddr; |
97f9efbc BS |
1873 | u64 sdata; |
1874 | u32 rkey; | |
3859e39d | 1875 | u8 next; |
97f9efbc | 1876 | |
3859e39d RC |
1877 | if (unlikely(!(qp->qp_access_flags & |
1878 | IB_ACCESS_REMOTE_ATOMIC))) | |
b506e1dc | 1879 | goto nack_inv; |
3859e39d RC |
1880 | next = qp->r_head_ack_queue + 1; |
1881 | if (next > IPATH_MAX_RDMA_ATOMIC) | |
1882 | next = 0; | |
e509be89 RC |
1883 | spin_lock_irqsave(&qp->s_lock, flags); |
1884 | /* Double check we can process this while holding the s_lock. */ | |
1885 | if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_RECV_OK)) | |
1886 | goto unlock; | |
d781b129 RC |
1887 | if (unlikely(next == qp->s_tail_ack_queue)) { |
1888 | if (!qp->s_ack_queue[next].sent) | |
e509be89 | 1889 | goto nack_inv_unlck; |
d781b129 RC |
1890 | ipath_update_ack_queue(qp, next); |
1891 | } | |
97f9efbc BS |
1892 | if (!header_in_data) |
1893 | ateth = &ohdr->u.atomic_eth; | |
3859e39d | 1894 | else |
97f9efbc | 1895 | ateth = (struct ib_atomic_eth *)data; |
3859e39d RC |
1896 | vaddr = ((u64) be32_to_cpu(ateth->vaddr[0]) << 32) | |
1897 | be32_to_cpu(ateth->vaddr[1]); | |
97f9efbc | 1898 | if (unlikely(vaddr & (sizeof(u64) - 1))) |
e509be89 | 1899 | goto nack_inv_unlck; |
97f9efbc BS |
1900 | rkey = be32_to_cpu(ateth->rkey); |
1901 | /* Check rkey & NAK */ | |
6a553af2 | 1902 | if (unlikely(!ipath_rkey_ok(qp, &qp->r_sge, |
97f9efbc BS |
1903 | sizeof(u64), vaddr, rkey, |
1904 | IB_ACCESS_REMOTE_ATOMIC))) | |
e509be89 | 1905 | goto nack_acc_unlck; |
97f9efbc | 1906 | /* Perform atomic OP and save result. */ |
3859e39d | 1907 | maddr = (atomic64_t *) qp->r_sge.sge.vaddr; |
97f9efbc | 1908 | sdata = be64_to_cpu(ateth->swap_data); |
3859e39d RC |
1909 | e = &qp->s_ack_queue[qp->r_head_ack_queue]; |
1910 | e->atomic_data = (opcode == OP(FETCH_ADD)) ? | |
1911 | (u64) atomic64_add_return(sdata, maddr) - sdata : | |
1912 | (u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr, | |
1913 | be64_to_cpu(ateth->compare_data), | |
1914 | sdata); | |
1915 | e->opcode = opcode; | |
d781b129 | 1916 | e->sent = 0; |
3859e39d | 1917 | e->psn = psn & IPATH_PSN_MASK; |
12eef41f | 1918 | qp->r_msn++; |
3859e39d RC |
1919 | qp->r_psn++; |
1920 | qp->r_state = opcode; | |
1921 | qp->r_nak_state = 0; | |
3859e39d RC |
1922 | qp->r_head_ack_queue = next; |
1923 | ||
e509be89 RC |
1924 | /* Schedule the send tasklet. */ |
1925 | ipath_schedule_send(qp); | |
3859e39d | 1926 | |
e509be89 | 1927 | goto unlock; |
97f9efbc BS |
1928 | } |
1929 | ||
1930 | default: | |
3859e39d RC |
1931 | /* NAK unknown opcodes. */ |
1932 | goto nack_inv; | |
97f9efbc BS |
1933 | } |
1934 | qp->r_psn++; | |
1935 | qp->r_state = opcode; | |
3859e39d | 1936 | qp->r_ack_psn = psn; |
12eef41f | 1937 | qp->r_nak_state = 0; |
97f9efbc | 1938 | /* Send an ACK if requested or required. */ |
3859e39d | 1939 | if (psn & (1 << 31)) |
12eef41f | 1940 | goto send_ack; |
12eef41f | 1941 | goto done; |
97f9efbc | 1942 | |
53dc1ca1 RC |
1943 | rnr_nak: |
1944 | qp->r_nak_state = IB_RNR_NAK | qp->r_min_rnr_timer; | |
1945 | qp->r_ack_psn = qp->r_psn; | |
1946 | goto send_ack; | |
1947 | ||
e509be89 RC |
1948 | nack_inv_unlck: |
1949 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
53dc1ca1 RC |
1950 | nack_inv: |
1951 | ipath_rc_error(qp, IB_WC_LOC_QP_OP_ERR); | |
1952 | qp->r_nak_state = IB_NAK_INVALID_REQUEST; | |
1953 | qp->r_ack_psn = qp->r_psn; | |
1954 | goto send_ack; | |
1955 | ||
e509be89 RC |
1956 | nack_acc_unlck: |
1957 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
12eef41f | 1958 | nack_acc: |
53dc1ca1 | 1959 | ipath_rc_error(qp, IB_WC_LOC_PROT_ERR); |
3859e39d RC |
1960 | qp->r_nak_state = IB_NAK_REMOTE_ACCESS_ERROR; |
1961 | qp->r_ack_psn = qp->r_psn; | |
12eef41f | 1962 | send_ack: |
3859e39d | 1963 | send_rc_ack(qp); |
e509be89 | 1964 | goto done; |
97f9efbc | 1965 | |
e509be89 RC |
1966 | unlock: |
1967 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
12eef41f | 1968 | done: |
97f9efbc BS |
1969 | return; |
1970 | } |