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Commit | Line | Data |
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97f9efbc | 1 | /* |
759d5768 | 2 | * Copyright (c) 2006 QLogic, Inc. 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 | ||
34 | #include "ipath_verbs.h" | |
34b2aafe | 35 | #include "ipath_kernel.h" |
97f9efbc BS |
36 | |
37 | /* cut down ridiculously long IB macro names */ | |
38 | #define OP(x) IB_OPCODE_RC_##x | |
39 | ||
3859e39d RC |
40 | static u32 restart_sge(struct ipath_sge_state *ss, struct ipath_swqe *wqe, |
41 | u32 psn, u32 pmtu) | |
42 | { | |
43 | u32 len; | |
44 | ||
45 | len = ((psn - wqe->psn) & IPATH_PSN_MASK) * pmtu; | |
46 | ss->sge = wqe->sg_list[0]; | |
47 | ss->sg_list = wqe->sg_list + 1; | |
48 | ss->num_sge = wqe->wr.num_sge; | |
49 | ipath_skip_sge(ss, len); | |
50 | return wqe->length - len; | |
51 | } | |
52 | ||
97f9efbc BS |
53 | /** |
54 | * ipath_init_restart- initialize the qp->s_sge after a restart | |
55 | * @qp: the QP who's SGE we're restarting | |
56 | * @wqe: the work queue to initialize the QP's SGE from | |
57 | * | |
12eef41f | 58 | * The QP s_lock should be held and interrupts disabled. |
97f9efbc BS |
59 | */ |
60 | static void ipath_init_restart(struct ipath_qp *qp, struct ipath_swqe *wqe) | |
61 | { | |
62 | struct ipath_ibdev *dev; | |
97f9efbc | 63 | |
3859e39d RC |
64 | qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn, |
65 | ib_mtu_enum_to_int(qp->path_mtu)); | |
97f9efbc BS |
66 | dev = to_idev(qp->ibqp.device); |
67 | spin_lock(&dev->pending_lock); | |
94b8d9f9 | 68 | if (list_empty(&qp->timerwait)) |
97f9efbc BS |
69 | list_add_tail(&qp->timerwait, |
70 | &dev->pending[dev->pending_index]); | |
71 | spin_unlock(&dev->pending_lock); | |
72 | } | |
73 | ||
74 | /** | |
75 | * ipath_make_rc_ack - construct a response packet (ACK, NAK, or RDMA read) | |
76 | * @qp: a pointer to the QP | |
77 | * @ohdr: a pointer to the IB header being constructed | |
78 | * @pmtu: the path MTU | |
79 | * | |
3859e39d RC |
80 | * Return 1 if constructed; otherwise, return 0. |
81 | * Note that we are in the responder's side of the QP context. | |
97f9efbc BS |
82 | * Note the QP s_lock must be held. |
83 | */ | |
3859e39d RC |
84 | static int ipath_make_rc_ack(struct ipath_qp *qp, |
85 | struct ipath_other_headers *ohdr, | |
86 | u32 pmtu, u32 *bth0p, u32 *bth2p) | |
97f9efbc | 87 | { |
3859e39d | 88 | struct ipath_ack_entry *e; |
97f9efbc BS |
89 | u32 hwords; |
90 | u32 len; | |
91 | u32 bth0; | |
3859e39d | 92 | u32 bth2; |
97f9efbc BS |
93 | |
94 | /* header size in 32-bit words LRH+BTH = (8+12)/4. */ | |
95 | hwords = 5; | |
96 | ||
97f9efbc | 97 | switch (qp->s_ack_state) { |
3859e39d RC |
98 | case OP(RDMA_READ_RESPONSE_LAST): |
99 | case OP(RDMA_READ_RESPONSE_ONLY): | |
100 | case OP(ATOMIC_ACKNOWLEDGE): | |
154257f3 RC |
101 | /* |
102 | * We can increment the tail pointer now that the last | |
103 | * response has been sent instead of only being | |
104 | * constructed. | |
105 | */ | |
106 | if (++qp->s_tail_ack_queue > IPATH_MAX_RDMA_ATOMIC) | |
107 | qp->s_tail_ack_queue = 0; | |
3859e39d | 108 | /* FALLTHROUGH */ |
154257f3 | 109 | case OP(SEND_ONLY): |
3859e39d RC |
110 | case OP(ACKNOWLEDGE): |
111 | /* Check for no next entry in the queue. */ | |
112 | if (qp->r_head_ack_queue == qp->s_tail_ack_queue) { | |
113 | if (qp->s_flags & IPATH_S_ACK_PENDING) | |
114 | goto normal; | |
154257f3 | 115 | qp->s_ack_state = OP(ACKNOWLEDGE); |
3859e39d RC |
116 | goto bail; |
117 | } | |
118 | ||
119 | e = &qp->s_ack_queue[qp->s_tail_ack_queue]; | |
120 | if (e->opcode == OP(RDMA_READ_REQUEST)) { | |
121 | /* Copy SGE state in case we need to resend */ | |
122 | qp->s_ack_rdma_sge = e->rdma_sge; | |
123 | qp->s_cur_sge = &qp->s_ack_rdma_sge; | |
124 | len = e->rdma_sge.sge.sge_length; | |
125 | if (len > pmtu) { | |
126 | len = pmtu; | |
127 | qp->s_ack_state = OP(RDMA_READ_RESPONSE_FIRST); | |
154257f3 | 128 | } else |
3859e39d | 129 | qp->s_ack_state = OP(RDMA_READ_RESPONSE_ONLY); |
3859e39d RC |
130 | ohdr->u.aeth = ipath_compute_aeth(qp); |
131 | hwords++; | |
132 | qp->s_ack_rdma_psn = e->psn; | |
133 | bth2 = qp->s_ack_rdma_psn++ & IPATH_PSN_MASK; | |
134 | } else { | |
135 | /* COMPARE_SWAP or FETCH_ADD */ | |
136 | qp->s_cur_sge = NULL; | |
137 | len = 0; | |
138 | qp->s_ack_state = OP(ATOMIC_ACKNOWLEDGE); | |
139 | ohdr->u.at.aeth = ipath_compute_aeth(qp); | |
140 | ohdr->u.at.atomic_ack_eth[0] = | |
141 | cpu_to_be32(e->atomic_data >> 32); | |
142 | ohdr->u.at.atomic_ack_eth[1] = | |
143 | cpu_to_be32(e->atomic_data); | |
144 | hwords += sizeof(ohdr->u.at) / sizeof(u32); | |
145 | bth2 = e->psn; | |
3859e39d | 146 | } |
97f9efbc | 147 | bth0 = qp->s_ack_state << 24; |
97f9efbc BS |
148 | break; |
149 | ||
150 | case OP(RDMA_READ_RESPONSE_FIRST): | |
151 | qp->s_ack_state = OP(RDMA_READ_RESPONSE_MIDDLE); | |
152 | /* FALLTHROUGH */ | |
153 | case OP(RDMA_READ_RESPONSE_MIDDLE): | |
3859e39d | 154 | len = qp->s_ack_rdma_sge.sge.sge_length; |
97f9efbc BS |
155 | if (len > pmtu) |
156 | len = pmtu; | |
157 | else { | |
158 | ohdr->u.aeth = ipath_compute_aeth(qp); | |
159 | hwords++; | |
160 | qp->s_ack_state = OP(RDMA_READ_RESPONSE_LAST); | |
161 | } | |
97f9efbc | 162 | bth0 = qp->s_ack_state << 24; |
3859e39d | 163 | bth2 = qp->s_ack_rdma_psn++ & IPATH_PSN_MASK; |
97f9efbc BS |
164 | break; |
165 | ||
166 | default: | |
3859e39d | 167 | normal: |
12eef41f | 168 | /* |
3859e39d RC |
169 | * Send a regular ACK. |
170 | * Set the s_ack_state so we wait until after sending | |
171 | * the ACK before setting s_ack_state to ACKNOWLEDGE | |
172 | * (see above). | |
12eef41f | 173 | */ |
154257f3 | 174 | qp->s_ack_state = OP(SEND_ONLY); |
3859e39d RC |
175 | qp->s_flags &= ~IPATH_S_ACK_PENDING; |
176 | qp->s_cur_sge = NULL; | |
12eef41f | 177 | if (qp->s_nak_state) |
3859e39d RC |
178 | ohdr->u.aeth = |
179 | cpu_to_be32((qp->r_msn & IPATH_MSN_MASK) | | |
180 | (qp->s_nak_state << | |
181 | IPATH_AETH_CREDIT_SHIFT)); | |
12eef41f BS |
182 | else |
183 | ohdr->u.aeth = ipath_compute_aeth(qp); | |
97f9efbc | 184 | hwords++; |
3859e39d RC |
185 | len = 0; |
186 | bth0 = OP(ACKNOWLEDGE) << 24; | |
187 | bth2 = qp->s_ack_psn & IPATH_PSN_MASK; | |
97f9efbc BS |
188 | } |
189 | qp->s_hdrwords = hwords; | |
97f9efbc | 190 | qp->s_cur_size = len; |
1dd6a1be | 191 | *bth0p = bth0 | (1 << 22); /* Set M bit */ |
3859e39d RC |
192 | *bth2p = bth2; |
193 | return 1; | |
97f9efbc | 194 | |
12eef41f | 195 | bail: |
3859e39d | 196 | return 0; |
97f9efbc BS |
197 | } |
198 | ||
199 | /** | |
200 | * ipath_make_rc_req - construct a request packet (SEND, RDMA r/w, ATOMIC) | |
201 | * @qp: a pointer to the QP | |
202 | * @ohdr: a pointer to the IB header being constructed | |
203 | * @pmtu: the path MTU | |
204 | * @bth0p: pointer to the BTH opcode word | |
205 | * @bth2p: pointer to the BTH PSN word | |
206 | * | |
207 | * Return 1 if constructed; otherwise, return 0. | |
12eef41f | 208 | * Note the QP s_lock must be held and interrupts disabled. |
97f9efbc | 209 | */ |
ddd4bb22 BS |
210 | int ipath_make_rc_req(struct ipath_qp *qp, |
211 | struct ipath_other_headers *ohdr, | |
212 | u32 pmtu, u32 *bth0p, u32 *bth2p) | |
97f9efbc BS |
213 | { |
214 | struct ipath_ibdev *dev = to_idev(qp->ibqp.device); | |
215 | struct ipath_sge_state *ss; | |
216 | struct ipath_swqe *wqe; | |
217 | u32 hwords; | |
218 | u32 len; | |
219 | u32 bth0; | |
220 | u32 bth2; | |
221 | char newreq; | |
222 | ||
3859e39d RC |
223 | /* Sending responses has higher priority over sending requests. */ |
224 | if ((qp->r_head_ack_queue != qp->s_tail_ack_queue || | |
225 | (qp->s_flags & IPATH_S_ACK_PENDING) || | |
154257f3 | 226 | qp->s_ack_state != OP(ACKNOWLEDGE)) && |
3859e39d RC |
227 | ipath_make_rc_ack(qp, ohdr, pmtu, bth0p, bth2p)) |
228 | goto done; | |
229 | ||
97f9efbc | 230 | if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK) || |
c3af664a | 231 | qp->s_rnr_timeout || qp->s_wait_credit) |
3859e39d | 232 | goto bail; |
97f9efbc | 233 | |
6022943e BS |
234 | /* Limit the number of packets sent without an ACK. */ |
235 | if (ipath_cmp24(qp->s_psn, qp->s_last_psn + IPATH_PSN_CREDIT) > 0) { | |
236 | qp->s_wait_credit = 1; | |
237 | dev->n_rc_stalls++; | |
3859e39d | 238 | goto bail; |
6022943e BS |
239 | } |
240 | ||
97f9efbc BS |
241 | /* header size in 32-bit words LRH+BTH = (8+12)/4. */ |
242 | hwords = 5; | |
1dd6a1be | 243 | bth0 = 1 << 22; /* Set M bit */ |
97f9efbc BS |
244 | |
245 | /* Send a request. */ | |
246 | wqe = get_swqe_ptr(qp, qp->s_cur); | |
247 | switch (qp->s_state) { | |
248 | default: | |
249 | /* | |
250 | * Resend an old request or start a new one. | |
251 | * | |
252 | * We keep track of the current SWQE so that | |
253 | * we don't reset the "furthest progress" state | |
254 | * if we need to back up. | |
255 | */ | |
256 | newreq = 0; | |
257 | if (qp->s_cur == qp->s_tail) { | |
258 | /* Check if send work queue is empty. */ | |
259 | if (qp->s_tail == qp->s_head) | |
3859e39d RC |
260 | goto bail; |
261 | /* | |
262 | * If a fence is requested, wait for previous | |
263 | * RDMA read and atomic operations to finish. | |
264 | */ | |
265 | if ((wqe->wr.send_flags & IB_SEND_FENCE) && | |
266 | qp->s_num_rd_atomic) { | |
267 | qp->s_flags |= IPATH_S_FENCE_PENDING; | |
268 | goto bail; | |
269 | } | |
6022943e | 270 | wqe->psn = qp->s_next_psn; |
97f9efbc BS |
271 | newreq = 1; |
272 | } | |
273 | /* | |
274 | * Note that we have to be careful not to modify the | |
275 | * original work request since we may need to resend | |
276 | * it. | |
277 | */ | |
13b18c86 | 278 | len = wqe->length; |
97f9efbc BS |
279 | ss = &qp->s_sge; |
280 | bth2 = 0; | |
281 | switch (wqe->wr.opcode) { | |
282 | case IB_WR_SEND: | |
283 | case IB_WR_SEND_WITH_IMM: | |
284 | /* If no credit, return. */ | |
285 | if (qp->s_lsn != (u32) -1 && | |
286 | ipath_cmp24(wqe->ssn, qp->s_lsn + 1) > 0) | |
3859e39d | 287 | goto bail; |
97f9efbc BS |
288 | wqe->lpsn = wqe->psn; |
289 | if (len > pmtu) { | |
290 | wqe->lpsn += (len - 1) / pmtu; | |
291 | qp->s_state = OP(SEND_FIRST); | |
292 | len = pmtu; | |
293 | break; | |
294 | } | |
295 | if (wqe->wr.opcode == IB_WR_SEND) | |
296 | qp->s_state = OP(SEND_ONLY); | |
297 | else { | |
298 | qp->s_state = OP(SEND_ONLY_WITH_IMMEDIATE); | |
299 | /* Immediate data comes after the BTH */ | |
300 | ohdr->u.imm_data = wqe->wr.imm_data; | |
301 | hwords += 1; | |
302 | } | |
303 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
304 | bth0 |= 1 << 23; | |
305 | bth2 = 1 << 31; /* Request ACK. */ | |
306 | if (++qp->s_cur == qp->s_size) | |
307 | qp->s_cur = 0; | |
308 | break; | |
309 | ||
310 | case IB_WR_RDMA_WRITE: | |
6700efdf | 311 | if (newreq && qp->s_lsn != (u32) -1) |
97f9efbc BS |
312 | qp->s_lsn++; |
313 | /* FALLTHROUGH */ | |
314 | case IB_WR_RDMA_WRITE_WITH_IMM: | |
315 | /* If no credit, return. */ | |
316 | if (qp->s_lsn != (u32) -1 && | |
317 | ipath_cmp24(wqe->ssn, qp->s_lsn + 1) > 0) | |
3859e39d | 318 | goto bail; |
97f9efbc BS |
319 | ohdr->u.rc.reth.vaddr = |
320 | cpu_to_be64(wqe->wr.wr.rdma.remote_addr); | |
321 | ohdr->u.rc.reth.rkey = | |
322 | cpu_to_be32(wqe->wr.wr.rdma.rkey); | |
323 | ohdr->u.rc.reth.length = cpu_to_be32(len); | |
3859e39d | 324 | hwords += sizeof(struct ib_reth) / sizeof(u32); |
97f9efbc BS |
325 | wqe->lpsn = wqe->psn; |
326 | if (len > pmtu) { | |
327 | wqe->lpsn += (len - 1) / pmtu; | |
328 | qp->s_state = OP(RDMA_WRITE_FIRST); | |
329 | len = pmtu; | |
330 | break; | |
331 | } | |
332 | if (wqe->wr.opcode == IB_WR_RDMA_WRITE) | |
333 | qp->s_state = OP(RDMA_WRITE_ONLY); | |
334 | else { | |
335 | qp->s_state = | |
336 | OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE); | |
6700efdf | 337 | /* Immediate data comes after RETH */ |
97f9efbc BS |
338 | ohdr->u.rc.imm_data = wqe->wr.imm_data; |
339 | hwords += 1; | |
340 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
341 | bth0 |= 1 << 23; | |
342 | } | |
343 | bth2 = 1 << 31; /* Request ACK. */ | |
344 | if (++qp->s_cur == qp->s_size) | |
345 | qp->s_cur = 0; | |
346 | break; | |
347 | ||
348 | case IB_WR_RDMA_READ: | |
3859e39d RC |
349 | /* |
350 | * Don't allow more operations to be started | |
351 | * than the QP limits allow. | |
352 | */ | |
97f9efbc | 353 | if (newreq) { |
3859e39d RC |
354 | if (qp->s_num_rd_atomic >= |
355 | qp->s_max_rd_atomic) { | |
356 | qp->s_flags |= IPATH_S_RDMAR_PENDING; | |
357 | goto bail; | |
358 | } | |
359 | qp->s_num_rd_atomic++; | |
6700efdf BS |
360 | if (qp->s_lsn != (u32) -1) |
361 | qp->s_lsn++; | |
97f9efbc BS |
362 | /* |
363 | * Adjust s_next_psn to count the | |
364 | * expected number of responses. | |
365 | */ | |
366 | if (len > pmtu) | |
367 | qp->s_next_psn += (len - 1) / pmtu; | |
368 | wqe->lpsn = qp->s_next_psn++; | |
369 | } | |
3859e39d RC |
370 | ohdr->u.rc.reth.vaddr = |
371 | cpu_to_be64(wqe->wr.wr.rdma.remote_addr); | |
372 | ohdr->u.rc.reth.rkey = | |
373 | cpu_to_be32(wqe->wr.wr.rdma.rkey); | |
374 | ohdr->u.rc.reth.length = cpu_to_be32(len); | |
375 | qp->s_state = OP(RDMA_READ_REQUEST); | |
376 | hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32); | |
97f9efbc BS |
377 | ss = NULL; |
378 | len = 0; | |
379 | if (++qp->s_cur == qp->s_size) | |
380 | qp->s_cur = 0; | |
381 | break; | |
382 | ||
383 | case IB_WR_ATOMIC_CMP_AND_SWP: | |
384 | case IB_WR_ATOMIC_FETCH_AND_ADD: | |
3859e39d RC |
385 | /* |
386 | * Don't allow more operations to be started | |
387 | * than the QP limits allow. | |
388 | */ | |
97f9efbc | 389 | if (newreq) { |
3859e39d RC |
390 | if (qp->s_num_rd_atomic >= |
391 | qp->s_max_rd_atomic) { | |
392 | qp->s_flags |= IPATH_S_RDMAR_PENDING; | |
393 | goto bail; | |
394 | } | |
395 | qp->s_num_rd_atomic++; | |
6700efdf BS |
396 | if (qp->s_lsn != (u32) -1) |
397 | qp->s_lsn++; | |
97f9efbc BS |
398 | wqe->lpsn = wqe->psn; |
399 | } | |
3859e39d RC |
400 | if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP) { |
401 | qp->s_state = OP(COMPARE_SWAP); | |
402 | ohdr->u.atomic_eth.swap_data = cpu_to_be64( | |
403 | wqe->wr.wr.atomic.swap); | |
404 | ohdr->u.atomic_eth.compare_data = cpu_to_be64( | |
405 | wqe->wr.wr.atomic.compare_add); | |
406 | } else { | |
407 | qp->s_state = OP(FETCH_ADD); | |
408 | ohdr->u.atomic_eth.swap_data = cpu_to_be64( | |
409 | wqe->wr.wr.atomic.compare_add); | |
410 | ohdr->u.atomic_eth.compare_data = 0; | |
411 | } | |
412 | ohdr->u.atomic_eth.vaddr[0] = cpu_to_be32( | |
413 | wqe->wr.wr.atomic.remote_addr >> 32); | |
414 | ohdr->u.atomic_eth.vaddr[1] = cpu_to_be32( | |
415 | wqe->wr.wr.atomic.remote_addr); | |
416 | ohdr->u.atomic_eth.rkey = cpu_to_be32( | |
417 | wqe->wr.wr.atomic.rkey); | |
418 | hwords += sizeof(struct ib_atomic_eth) / sizeof(u32); | |
97f9efbc BS |
419 | ss = NULL; |
420 | len = 0; | |
3859e39d RC |
421 | if (++qp->s_cur == qp->s_size) |
422 | qp->s_cur = 0; | |
97f9efbc BS |
423 | break; |
424 | ||
425 | default: | |
3859e39d | 426 | goto bail; |
97f9efbc | 427 | } |
13b18c86 RC |
428 | qp->s_sge.sge = wqe->sg_list[0]; |
429 | qp->s_sge.sg_list = wqe->sg_list + 1; | |
430 | qp->s_sge.num_sge = wqe->wr.num_sge; | |
431 | qp->s_len = wqe->length; | |
97f9efbc BS |
432 | if (newreq) { |
433 | qp->s_tail++; | |
434 | if (qp->s_tail >= qp->s_size) | |
435 | qp->s_tail = 0; | |
436 | } | |
13b18c86 RC |
437 | bth2 |= qp->s_psn & IPATH_PSN_MASK; |
438 | if (wqe->wr.opcode == IB_WR_RDMA_READ) | |
439 | qp->s_psn = wqe->lpsn + 1; | |
440 | else { | |
441 | qp->s_psn++; | |
6f5c4074 | 442 | if (ipath_cmp24(qp->s_psn, qp->s_next_psn) > 0) |
13b18c86 RC |
443 | qp->s_next_psn = qp->s_psn; |
444 | } | |
12eef41f BS |
445 | /* |
446 | * Put the QP on the pending list so lost ACKs will cause | |
447 | * a retry. More than one request can be pending so the | |
448 | * QP may already be on the dev->pending list. | |
449 | */ | |
97f9efbc | 450 | spin_lock(&dev->pending_lock); |
94b8d9f9 | 451 | if (list_empty(&qp->timerwait)) |
97f9efbc BS |
452 | list_add_tail(&qp->timerwait, |
453 | &dev->pending[dev->pending_index]); | |
454 | spin_unlock(&dev->pending_lock); | |
455 | break; | |
456 | ||
457 | case OP(RDMA_READ_RESPONSE_FIRST): | |
458 | /* | |
12eef41f BS |
459 | * This case can only happen if a send is restarted. |
460 | * See ipath_restart_rc(). | |
97f9efbc BS |
461 | */ |
462 | ipath_init_restart(qp, wqe); | |
463 | /* FALLTHROUGH */ | |
464 | case OP(SEND_FIRST): | |
465 | qp->s_state = OP(SEND_MIDDLE); | |
466 | /* FALLTHROUGH */ | |
467 | case OP(SEND_MIDDLE): | |
27b678dd | 468 | bth2 = qp->s_psn++ & IPATH_PSN_MASK; |
6f5c4074 | 469 | if (ipath_cmp24(qp->s_psn, qp->s_next_psn) > 0) |
97f9efbc BS |
470 | qp->s_next_psn = qp->s_psn; |
471 | ss = &qp->s_sge; | |
472 | len = qp->s_len; | |
473 | if (len > pmtu) { | |
97f9efbc BS |
474 | len = pmtu; |
475 | break; | |
476 | } | |
477 | if (wqe->wr.opcode == IB_WR_SEND) | |
478 | qp->s_state = OP(SEND_LAST); | |
479 | else { | |
480 | qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE); | |
481 | /* Immediate data comes after the BTH */ | |
482 | ohdr->u.imm_data = wqe->wr.imm_data; | |
483 | hwords += 1; | |
484 | } | |
485 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
486 | bth0 |= 1 << 23; | |
487 | bth2 |= 1 << 31; /* Request ACK. */ | |
488 | qp->s_cur++; | |
489 | if (qp->s_cur >= qp->s_size) | |
490 | qp->s_cur = 0; | |
491 | break; | |
492 | ||
493 | case OP(RDMA_READ_RESPONSE_LAST): | |
494 | /* | |
495 | * This case can only happen if a RDMA write is restarted. | |
496 | * See ipath_restart_rc(). | |
497 | */ | |
498 | ipath_init_restart(qp, wqe); | |
499 | /* FALLTHROUGH */ | |
500 | case OP(RDMA_WRITE_FIRST): | |
501 | qp->s_state = OP(RDMA_WRITE_MIDDLE); | |
502 | /* FALLTHROUGH */ | |
503 | case OP(RDMA_WRITE_MIDDLE): | |
27b678dd | 504 | bth2 = qp->s_psn++ & IPATH_PSN_MASK; |
6f5c4074 | 505 | if (ipath_cmp24(qp->s_psn, qp->s_next_psn) > 0) |
97f9efbc BS |
506 | qp->s_next_psn = qp->s_psn; |
507 | ss = &qp->s_sge; | |
508 | len = qp->s_len; | |
509 | if (len > pmtu) { | |
97f9efbc BS |
510 | len = pmtu; |
511 | break; | |
512 | } | |
513 | if (wqe->wr.opcode == IB_WR_RDMA_WRITE) | |
514 | qp->s_state = OP(RDMA_WRITE_LAST); | |
515 | else { | |
516 | qp->s_state = OP(RDMA_WRITE_LAST_WITH_IMMEDIATE); | |
517 | /* Immediate data comes after the BTH */ | |
518 | ohdr->u.imm_data = wqe->wr.imm_data; | |
519 | hwords += 1; | |
520 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
521 | bth0 |= 1 << 23; | |
522 | } | |
523 | bth2 |= 1 << 31; /* Request ACK. */ | |
524 | qp->s_cur++; | |
525 | if (qp->s_cur >= qp->s_size) | |
526 | qp->s_cur = 0; | |
527 | break; | |
528 | ||
529 | case OP(RDMA_READ_RESPONSE_MIDDLE): | |
530 | /* | |
531 | * This case can only happen if a RDMA read is restarted. | |
532 | * See ipath_restart_rc(). | |
533 | */ | |
534 | ipath_init_restart(qp, wqe); | |
27b678dd | 535 | len = ((qp->s_psn - wqe->psn) & IPATH_PSN_MASK) * pmtu; |
97f9efbc BS |
536 | ohdr->u.rc.reth.vaddr = |
537 | cpu_to_be64(wqe->wr.wr.rdma.remote_addr + len); | |
538 | ohdr->u.rc.reth.rkey = | |
539 | cpu_to_be32(wqe->wr.wr.rdma.rkey); | |
540 | ohdr->u.rc.reth.length = cpu_to_be32(qp->s_len); | |
541 | qp->s_state = OP(RDMA_READ_REQUEST); | |
3859e39d | 542 | hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32); |
27b678dd | 543 | bth2 = qp->s_psn++ & IPATH_PSN_MASK; |
6f5c4074 | 544 | if (ipath_cmp24(qp->s_psn, qp->s_next_psn) > 0) |
97f9efbc BS |
545 | qp->s_next_psn = qp->s_psn; |
546 | ss = NULL; | |
547 | len = 0; | |
548 | qp->s_cur++; | |
549 | if (qp->s_cur == qp->s_size) | |
550 | qp->s_cur = 0; | |
551 | break; | |
97f9efbc | 552 | } |
6022943e BS |
553 | if (ipath_cmp24(qp->s_psn, qp->s_last_psn + IPATH_PSN_CREDIT - 1) >= 0) |
554 | bth2 |= 1 << 31; /* Request ACK. */ | |
97f9efbc BS |
555 | qp->s_len -= len; |
556 | qp->s_hdrwords = hwords; | |
557 | qp->s_cur_sge = ss; | |
558 | qp->s_cur_size = len; | |
559 | *bth0p = bth0 | (qp->s_state << 24); | |
560 | *bth2p = bth2; | |
3859e39d | 561 | done: |
97f9efbc BS |
562 | return 1; |
563 | ||
3859e39d | 564 | bail: |
97f9efbc BS |
565 | return 0; |
566 | } | |
567 | ||
97f9efbc | 568 | /** |
ddd4bb22 BS |
569 | * send_rc_ack - Construct an ACK packet and send it |
570 | * @qp: a pointer to the QP | |
97f9efbc | 571 | * |
ddd4bb22 BS |
572 | * This is called from ipath_rc_rcv() and only uses the receive |
573 | * side QP state. | |
3859e39d RC |
574 | * Note that RDMA reads and atomics are handled in the |
575 | * send side QP state and tasklet. | |
97f9efbc | 576 | */ |
97f9efbc BS |
577 | static void send_rc_ack(struct ipath_qp *qp) |
578 | { | |
579 | struct ipath_ibdev *dev = to_idev(qp->ibqp.device); | |
580 | u16 lrh0; | |
581 | u32 bth0; | |
ddd4bb22 BS |
582 | u32 hwords; |
583 | struct ipath_ib_header hdr; | |
97f9efbc | 584 | struct ipath_other_headers *ohdr; |
35ff032e | 585 | unsigned long flags; |
97f9efbc | 586 | |
3859e39d | 587 | /* Don't send ACK or NAK if a RDMA read or atomic is pending. */ |
154257f3 RC |
588 | if (qp->r_head_ack_queue != qp->s_tail_ack_queue || |
589 | (qp->s_flags & IPATH_S_ACK_PENDING) || | |
590 | qp->s_ack_state != OP(ACKNOWLEDGE)) | |
3859e39d RC |
591 | goto queue_ack; |
592 | ||
97f9efbc | 593 | /* Construct the header. */ |
ddd4bb22 | 594 | ohdr = &hdr.u.oth; |
27b678dd | 595 | lrh0 = IPATH_LRH_BTH; |
97f9efbc | 596 | /* header size in 32-bit words LRH+BTH+AETH = (8+12+4)/4. */ |
ddd4bb22 | 597 | hwords = 6; |
97f9efbc | 598 | if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) { |
ddd4bb22 BS |
599 | hwords += ipath_make_grh(dev, &hdr.u.l.grh, |
600 | &qp->remote_ah_attr.grh, | |
601 | hwords, 0); | |
602 | ohdr = &hdr.u.l.oth; | |
27b678dd | 603 | lrh0 = IPATH_LRH_GRH; |
97f9efbc | 604 | } |
12eef41f | 605 | /* read pkey_index w/o lock (its atomic) */ |
3859e39d | 606 | bth0 = ipath_get_pkey(dev->dd, qp->s_pkey_index) | |
1dd6a1be | 607 | (OP(ACKNOWLEDGE) << 24) | (1 << 22); |
12eef41f | 608 | if (qp->r_nak_state) |
27b678dd | 609 | ohdr->u.aeth = cpu_to_be32((qp->r_msn & IPATH_MSN_MASK) | |
12eef41f | 610 | (qp->r_nak_state << |
27b678dd | 611 | IPATH_AETH_CREDIT_SHIFT)); |
12eef41f BS |
612 | else |
613 | ohdr->u.aeth = ipath_compute_aeth(qp); | |
97f9efbc | 614 | lrh0 |= qp->remote_ah_attr.sl << 4; |
ddd4bb22 BS |
615 | hdr.lrh[0] = cpu_to_be16(lrh0); |
616 | hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); | |
617 | hdr.lrh[2] = cpu_to_be16(hwords + SIZE_OF_CRC); | |
34b2aafe | 618 | hdr.lrh[3] = cpu_to_be16(dev->dd->ipath_lid); |
97f9efbc BS |
619 | ohdr->bth[0] = cpu_to_be32(bth0); |
620 | ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); | |
27b678dd | 621 | ohdr->bth[2] = cpu_to_be32(qp->r_ack_psn & IPATH_PSN_MASK); |
97f9efbc BS |
622 | |
623 | /* | |
624 | * If we can send the ACK, clear the ACK state. | |
625 | */ | |
ddd4bb22 | 626 | if (ipath_verbs_send(dev->dd, hwords, (u32 *) &hdr, 0, NULL) == 0) { |
97f9efbc | 627 | dev->n_unicast_xmit++; |
3859e39d | 628 | goto done; |
97f9efbc | 629 | } |
3859e39d RC |
630 | |
631 | /* | |
632 | * We are out of PIO buffers at the moment. | |
633 | * Pass responsibility for sending the ACK to the | |
634 | * send tasklet so that when a PIO buffer becomes | |
635 | * available, the ACK is sent ahead of other outgoing | |
636 | * packets. | |
637 | */ | |
638 | dev->n_rc_qacks++; | |
639 | ||
640 | queue_ack: | |
35ff032e | 641 | spin_lock_irqsave(&qp->s_lock, flags); |
3859e39d RC |
642 | qp->s_flags |= IPATH_S_ACK_PENDING; |
643 | qp->s_nak_state = qp->r_nak_state; | |
644 | qp->s_ack_psn = qp->r_ack_psn; | |
35ff032e | 645 | spin_unlock_irqrestore(&qp->s_lock, flags); |
3859e39d RC |
646 | |
647 | /* Call ipath_do_rc_send() in another thread. */ | |
648 | tasklet_hi_schedule(&qp->s_task); | |
649 | ||
650 | done: | |
651 | return; | |
97f9efbc BS |
652 | } |
653 | ||
6700efdf BS |
654 | /** |
655 | * reset_psn - reset the QP state to send starting from PSN | |
656 | * @qp: the QP | |
657 | * @psn: the packet sequence number to restart at | |
658 | * | |
659 | * This is called from ipath_rc_rcv() to process an incoming RC ACK | |
660 | * for the given QP. | |
661 | * Called at interrupt level with the QP s_lock held. | |
662 | */ | |
663 | static void reset_psn(struct ipath_qp *qp, u32 psn) | |
664 | { | |
665 | u32 n = qp->s_last; | |
666 | struct ipath_swqe *wqe = get_swqe_ptr(qp, n); | |
667 | u32 opcode; | |
668 | ||
669 | qp->s_cur = n; | |
670 | ||
671 | /* | |
672 | * If we are starting the request from the beginning, | |
673 | * let the normal send code handle initialization. | |
674 | */ | |
675 | if (ipath_cmp24(psn, wqe->psn) <= 0) { | |
676 | qp->s_state = OP(SEND_LAST); | |
677 | goto done; | |
678 | } | |
679 | ||
680 | /* Find the work request opcode corresponding to the given PSN. */ | |
681 | opcode = wqe->wr.opcode; | |
682 | for (;;) { | |
683 | int diff; | |
684 | ||
685 | if (++n == qp->s_size) | |
686 | n = 0; | |
687 | if (n == qp->s_tail) | |
688 | break; | |
689 | wqe = get_swqe_ptr(qp, n); | |
690 | diff = ipath_cmp24(psn, wqe->psn); | |
691 | if (diff < 0) | |
692 | break; | |
693 | qp->s_cur = n; | |
694 | /* | |
695 | * If we are starting the request from the beginning, | |
696 | * let the normal send code handle initialization. | |
697 | */ | |
698 | if (diff == 0) { | |
699 | qp->s_state = OP(SEND_LAST); | |
700 | goto done; | |
701 | } | |
702 | opcode = wqe->wr.opcode; | |
703 | } | |
704 | ||
705 | /* | |
706 | * Set the state to restart in the middle of a request. | |
707 | * Don't change the s_sge, s_cur_sge, or s_cur_size. | |
708 | * See ipath_do_rc_send(). | |
709 | */ | |
710 | switch (opcode) { | |
711 | case IB_WR_SEND: | |
712 | case IB_WR_SEND_WITH_IMM: | |
713 | qp->s_state = OP(RDMA_READ_RESPONSE_FIRST); | |
714 | break; | |
715 | ||
716 | case IB_WR_RDMA_WRITE: | |
717 | case IB_WR_RDMA_WRITE_WITH_IMM: | |
718 | qp->s_state = OP(RDMA_READ_RESPONSE_LAST); | |
719 | break; | |
720 | ||
721 | case IB_WR_RDMA_READ: | |
722 | qp->s_state = OP(RDMA_READ_RESPONSE_MIDDLE); | |
723 | break; | |
724 | ||
725 | default: | |
726 | /* | |
727 | * This case shouldn't happen since its only | |
728 | * one PSN per req. | |
729 | */ | |
730 | qp->s_state = OP(SEND_LAST); | |
731 | } | |
732 | done: | |
733 | qp->s_psn = psn; | |
734 | } | |
735 | ||
97f9efbc BS |
736 | /** |
737 | * ipath_restart_rc - back up requester to resend the last un-ACKed request | |
738 | * @qp: the QP to restart | |
739 | * @psn: packet sequence number for the request | |
740 | * @wc: the work completion request | |
741 | * | |
12eef41f | 742 | * The QP s_lock should be held and interrupts disabled. |
97f9efbc BS |
743 | */ |
744 | void ipath_restart_rc(struct ipath_qp *qp, u32 psn, struct ib_wc *wc) | |
745 | { | |
746 | struct ipath_swqe *wqe = get_swqe_ptr(qp, qp->s_last); | |
747 | struct ipath_ibdev *dev; | |
97f9efbc | 748 | |
97f9efbc BS |
749 | if (qp->s_retry == 0) { |
750 | wc->wr_id = wqe->wr.wr_id; | |
751 | wc->status = IB_WC_RETRY_EXC_ERR; | |
752 | wc->opcode = ib_ipath_wc_opcode[wqe->wr.opcode]; | |
753 | wc->vendor_err = 0; | |
754 | wc->byte_len = 0; | |
062dbb69 | 755 | wc->qp = &qp->ibqp; |
97f9efbc BS |
756 | wc->src_qp = qp->remote_qpn; |
757 | wc->pkey_index = 0; | |
758 | wc->slid = qp->remote_ah_attr.dlid; | |
759 | wc->sl = qp->remote_ah_attr.sl; | |
760 | wc->dlid_path_bits = 0; | |
761 | wc->port_num = 0; | |
762 | ipath_sqerror_qp(qp, wc); | |
763 | goto bail; | |
764 | } | |
765 | qp->s_retry--; | |
766 | ||
767 | /* | |
768 | * Remove the QP from the timeout queue. | |
769 | * Note: it may already have been removed by ipath_ib_timer(). | |
770 | */ | |
771 | dev = to_idev(qp->ibqp.device); | |
772 | spin_lock(&dev->pending_lock); | |
94b8d9f9 BS |
773 | if (!list_empty(&qp->timerwait)) |
774 | list_del_init(&qp->timerwait); | |
97f9efbc BS |
775 | spin_unlock(&dev->pending_lock); |
776 | ||
777 | if (wqe->wr.opcode == IB_WR_RDMA_READ) | |
778 | dev->n_rc_resends++; | |
779 | else | |
6f5c4074 | 780 | dev->n_rc_resends += (qp->s_psn - psn) & IPATH_PSN_MASK; |
97f9efbc | 781 | |
6700efdf | 782 | reset_psn(qp, psn); |
97f9efbc BS |
783 | tasklet_hi_schedule(&qp->s_task); |
784 | ||
785 | bail: | |
786 | return; | |
787 | } | |
788 | ||
6022943e BS |
789 | static inline void update_last_psn(struct ipath_qp *qp, u32 psn) |
790 | { | |
791 | if (qp->s_wait_credit) { | |
792 | qp->s_wait_credit = 0; | |
793 | tasklet_hi_schedule(&qp->s_task); | |
794 | } | |
795 | qp->s_last_psn = psn; | |
796 | } | |
797 | ||
97f9efbc BS |
798 | /** |
799 | * do_rc_ack - process an incoming RC ACK | |
800 | * @qp: the QP the ACK came in on | |
801 | * @psn: the packet sequence number of the ACK | |
802 | * @opcode: the opcode of the request that resulted in the ACK | |
803 | * | |
6700efdf | 804 | * This is called from ipath_rc_rcv_resp() to process an incoming RC ACK |
97f9efbc | 805 | * for the given QP. |
12eef41f | 806 | * Called at interrupt level with the QP s_lock held and interrupts disabled. |
97f9efbc BS |
807 | * Returns 1 if OK, 0 if current operation should be aborted (NAK). |
808 | */ | |
809 | static int do_rc_ack(struct ipath_qp *qp, u32 aeth, u32 psn, int opcode) | |
810 | { | |
811 | struct ipath_ibdev *dev = to_idev(qp->ibqp.device); | |
812 | struct ib_wc wc; | |
813 | struct ipath_swqe *wqe; | |
814 | int ret = 0; | |
13b18c86 | 815 | u32 ack_psn; |
97f9efbc BS |
816 | |
817 | /* | |
818 | * Remove the QP from the timeout queue (or RNR timeout queue). | |
819 | * If ipath_ib_timer() has already removed it, | |
820 | * it's OK since we hold the QP s_lock and ipath_restart_rc() | |
821 | * just won't find anything to restart if we ACK everything. | |
822 | */ | |
823 | spin_lock(&dev->pending_lock); | |
94b8d9f9 BS |
824 | if (!list_empty(&qp->timerwait)) |
825 | list_del_init(&qp->timerwait); | |
97f9efbc BS |
826 | spin_unlock(&dev->pending_lock); |
827 | ||
828 | /* | |
829 | * Note that NAKs implicitly ACK outstanding SEND and RDMA write | |
830 | * requests and implicitly NAK RDMA read and atomic requests issued | |
831 | * before the NAK'ed request. The MSN won't include the NAK'ed | |
832 | * request but will include an ACK'ed request(s). | |
833 | */ | |
13b18c86 RC |
834 | ack_psn = psn; |
835 | if (aeth >> 29) | |
836 | ack_psn--; | |
97f9efbc BS |
837 | wqe = get_swqe_ptr(qp, qp->s_last); |
838 | ||
97f9efbc BS |
839 | /* |
840 | * The MSN might be for a later WQE than the PSN indicates so | |
841 | * only complete WQEs that the PSN finishes. | |
842 | */ | |
13b18c86 | 843 | while (ipath_cmp24(ack_psn, wqe->lpsn) >= 0) { |
97f9efbc BS |
844 | /* |
845 | * If this request is a RDMA read or atomic, and the ACK is | |
846 | * for a later operation, this ACK NAKs the RDMA read or | |
847 | * atomic. In other words, only a RDMA_READ_LAST or ONLY | |
848 | * can ACK a RDMA read and likewise for atomic ops. Note | |
849 | * that the NAK case can only happen if relaxed ordering is | |
850 | * used and requests are sent after an RDMA read or atomic | |
851 | * is sent but before the response is received. | |
852 | */ | |
853 | if ((wqe->wr.opcode == IB_WR_RDMA_READ && | |
13b18c86 | 854 | (opcode != OP(RDMA_READ_RESPONSE_LAST) || |
3859e39d | 855 | ipath_cmp24(ack_psn, wqe->lpsn) != 0)) || |
97f9efbc BS |
856 | ((wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || |
857 | wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) && | |
858 | (opcode != OP(ATOMIC_ACKNOWLEDGE) || | |
859 | ipath_cmp24(wqe->psn, psn) != 0))) { | |
860 | /* | |
861 | * The last valid PSN seen is the previous | |
862 | * request's. | |
863 | */ | |
6022943e | 864 | update_last_psn(qp, wqe->psn - 1); |
97f9efbc BS |
865 | /* Retry this request. */ |
866 | ipath_restart_rc(qp, wqe->psn, &wc); | |
867 | /* | |
868 | * No need to process the ACK/NAK since we are | |
869 | * restarting an earlier request. | |
870 | */ | |
871 | goto bail; | |
872 | } | |
3859e39d RC |
873 | if (qp->s_num_rd_atomic && |
874 | (wqe->wr.opcode == IB_WR_RDMA_READ || | |
875 | wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || | |
876 | wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD)) { | |
877 | qp->s_num_rd_atomic--; | |
878 | /* Restart sending task if fence is complete */ | |
879 | if ((qp->s_flags & IPATH_S_FENCE_PENDING) && | |
880 | !qp->s_num_rd_atomic) { | |
881 | qp->s_flags &= ~IPATH_S_FENCE_PENDING; | |
882 | tasklet_hi_schedule(&qp->s_task); | |
883 | } else if (qp->s_flags & IPATH_S_RDMAR_PENDING) { | |
884 | qp->s_flags &= ~IPATH_S_RDMAR_PENDING; | |
885 | tasklet_hi_schedule(&qp->s_task); | |
886 | } | |
887 | } | |
97f9efbc | 888 | /* Post a send completion queue entry if requested. */ |
3859e39d | 889 | if (!(qp->s_flags & IPATH_S_SIGNAL_REQ_WR) || |
97f9efbc BS |
890 | (wqe->wr.send_flags & IB_SEND_SIGNALED)) { |
891 | wc.wr_id = wqe->wr.wr_id; | |
892 | wc.status = IB_WC_SUCCESS; | |
893 | wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode]; | |
894 | wc.vendor_err = 0; | |
895 | wc.byte_len = wqe->length; | |
0434d271 | 896 | wc.imm_data = 0; |
062dbb69 | 897 | wc.qp = &qp->ibqp; |
97f9efbc | 898 | wc.src_qp = qp->remote_qpn; |
0434d271 | 899 | wc.wc_flags = 0; |
97f9efbc BS |
900 | wc.pkey_index = 0; |
901 | wc.slid = qp->remote_ah_attr.dlid; | |
902 | wc.sl = qp->remote_ah_attr.sl; | |
903 | wc.dlid_path_bits = 0; | |
904 | wc.port_num = 0; | |
905 | ipath_cq_enter(to_icq(qp->ibqp.send_cq), &wc, 0); | |
906 | } | |
907 | qp->s_retry = qp->s_retry_cnt; | |
908 | /* | |
909 | * If we are completing a request which is in the process of | |
910 | * being resent, we can stop resending it since we know the | |
911 | * responder has already seen it. | |
912 | */ | |
913 | if (qp->s_last == qp->s_cur) { | |
914 | if (++qp->s_cur >= qp->s_size) | |
915 | qp->s_cur = 0; | |
6f5c4074 RC |
916 | qp->s_last = qp->s_cur; |
917 | if (qp->s_last == qp->s_tail) | |
918 | break; | |
97f9efbc BS |
919 | wqe = get_swqe_ptr(qp, qp->s_cur); |
920 | qp->s_state = OP(SEND_LAST); | |
921 | qp->s_psn = wqe->psn; | |
6f5c4074 RC |
922 | } else { |
923 | if (++qp->s_last >= qp->s_size) | |
924 | qp->s_last = 0; | |
925 | if (qp->s_last == qp->s_tail) | |
926 | break; | |
927 | wqe = get_swqe_ptr(qp, qp->s_last); | |
97f9efbc | 928 | } |
97f9efbc BS |
929 | } |
930 | ||
931 | switch (aeth >> 29) { | |
932 | case 0: /* ACK */ | |
933 | dev->n_rc_acks++; | |
934 | /* If this is a partial ACK, reset the retransmit timer. */ | |
935 | if (qp->s_last != qp->s_tail) { | |
936 | spin_lock(&dev->pending_lock); | |
937 | list_add_tail(&qp->timerwait, | |
938 | &dev->pending[dev->pending_index]); | |
939 | spin_unlock(&dev->pending_lock); | |
6f5c4074 RC |
940 | /* |
941 | * If we get a partial ACK for a resent operation, | |
942 | * we can stop resending the earlier packets and | |
943 | * continue with the next packet the receiver wants. | |
944 | */ | |
945 | if (ipath_cmp24(qp->s_psn, psn) <= 0) { | |
946 | reset_psn(qp, psn + 1); | |
947 | tasklet_hi_schedule(&qp->s_task); | |
948 | } | |
949 | } else if (ipath_cmp24(qp->s_psn, psn) <= 0) { | |
950 | qp->s_state = OP(SEND_LAST); | |
951 | qp->s_psn = psn + 1; | |
97f9efbc BS |
952 | } |
953 | ipath_get_credit(qp, aeth); | |
954 | qp->s_rnr_retry = qp->s_rnr_retry_cnt; | |
955 | qp->s_retry = qp->s_retry_cnt; | |
6022943e | 956 | update_last_psn(qp, psn); |
97f9efbc BS |
957 | ret = 1; |
958 | goto bail; | |
959 | ||
960 | case 1: /* RNR NAK */ | |
961 | dev->n_rnr_naks++; | |
6f5c4074 RC |
962 | if (qp->s_last == qp->s_tail) |
963 | goto bail; | |
97f9efbc | 964 | if (qp->s_rnr_retry == 0) { |
97f9efbc BS |
965 | wc.status = IB_WC_RNR_RETRY_EXC_ERR; |
966 | goto class_b; | |
967 | } | |
968 | if (qp->s_rnr_retry_cnt < 7) | |
969 | qp->s_rnr_retry--; | |
97f9efbc | 970 | |
6700efdf | 971 | /* The last valid PSN is the previous PSN. */ |
6022943e | 972 | update_last_psn(qp, psn - 1); |
97f9efbc | 973 | |
6f5c4074 RC |
974 | if (wqe->wr.opcode == IB_WR_RDMA_READ) |
975 | dev->n_rc_resends++; | |
976 | else | |
977 | dev->n_rc_resends += | |
978 | (qp->s_psn - psn) & IPATH_PSN_MASK; | |
97f9efbc | 979 | |
6700efdf | 980 | reset_psn(qp, psn); |
97f9efbc BS |
981 | |
982 | qp->s_rnr_timeout = | |
27b678dd BS |
983 | ib_ipath_rnr_table[(aeth >> IPATH_AETH_CREDIT_SHIFT) & |
984 | IPATH_AETH_CREDIT_MASK]; | |
97f9efbc BS |
985 | ipath_insert_rnr_queue(qp); |
986 | goto bail; | |
987 | ||
988 | case 3: /* NAK */ | |
6f5c4074 RC |
989 | if (qp->s_last == qp->s_tail) |
990 | goto bail; | |
991 | /* The last valid PSN is the previous PSN. */ | |
992 | update_last_psn(qp, psn - 1); | |
27b678dd BS |
993 | switch ((aeth >> IPATH_AETH_CREDIT_SHIFT) & |
994 | IPATH_AETH_CREDIT_MASK) { | |
97f9efbc BS |
995 | case 0: /* PSN sequence error */ |
996 | dev->n_seq_naks++; | |
997 | /* | |
6f5c4074 | 998 | * Back up to the responder's expected PSN. |
97f9efbc BS |
999 | * Note that we might get a NAK in the middle of an |
1000 | * RDMA READ response which terminates the RDMA | |
1001 | * READ. | |
1002 | */ | |
97f9efbc BS |
1003 | ipath_restart_rc(qp, psn, &wc); |
1004 | break; | |
1005 | ||
1006 | case 1: /* Invalid Request */ | |
1007 | wc.status = IB_WC_REM_INV_REQ_ERR; | |
1008 | dev->n_other_naks++; | |
1009 | goto class_b; | |
1010 | ||
1011 | case 2: /* Remote Access Error */ | |
1012 | wc.status = IB_WC_REM_ACCESS_ERR; | |
1013 | dev->n_other_naks++; | |
1014 | goto class_b; | |
1015 | ||
1016 | case 3: /* Remote Operation Error */ | |
1017 | wc.status = IB_WC_REM_OP_ERR; | |
1018 | dev->n_other_naks++; | |
1019 | class_b: | |
1020 | wc.wr_id = wqe->wr.wr_id; | |
1021 | wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode]; | |
1022 | wc.vendor_err = 0; | |
1023 | wc.byte_len = 0; | |
062dbb69 | 1024 | wc.qp = &qp->ibqp; |
97f9efbc BS |
1025 | wc.src_qp = qp->remote_qpn; |
1026 | wc.pkey_index = 0; | |
1027 | wc.slid = qp->remote_ah_attr.dlid; | |
1028 | wc.sl = qp->remote_ah_attr.sl; | |
1029 | wc.dlid_path_bits = 0; | |
1030 | wc.port_num = 0; | |
1031 | ipath_sqerror_qp(qp, &wc); | |
1032 | break; | |
1033 | ||
1034 | default: | |
1035 | /* Ignore other reserved NAK error codes */ | |
1036 | goto reserved; | |
1037 | } | |
1038 | qp->s_rnr_retry = qp->s_rnr_retry_cnt; | |
1039 | goto bail; | |
1040 | ||
1041 | default: /* 2: reserved */ | |
1042 | reserved: | |
1043 | /* Ignore reserved NAK codes. */ | |
1044 | goto bail; | |
1045 | } | |
1046 | ||
1047 | bail: | |
1048 | return ret; | |
1049 | } | |
1050 | ||
1051 | /** | |
1052 | * ipath_rc_rcv_resp - process an incoming RC response packet | |
1053 | * @dev: the device this packet came in on | |
1054 | * @ohdr: the other headers for this packet | |
1055 | * @data: the packet data | |
1056 | * @tlen: the packet length | |
1057 | * @qp: the QP for this packet | |
1058 | * @opcode: the opcode for this packet | |
1059 | * @psn: the packet sequence number for this packet | |
1060 | * @hdrsize: the header length | |
1061 | * @pmtu: the path MTU | |
1062 | * @header_in_data: true if part of the header data is in the data buffer | |
1063 | * | |
1064 | * This is called from ipath_rc_rcv() to process an incoming RC response | |
1065 | * packet for the given QP. | |
1066 | * Called at interrupt level. | |
1067 | */ | |
1068 | static inline void ipath_rc_rcv_resp(struct ipath_ibdev *dev, | |
1069 | struct ipath_other_headers *ohdr, | |
1070 | void *data, u32 tlen, | |
1071 | struct ipath_qp *qp, | |
1072 | u32 opcode, | |
1073 | u32 psn, u32 hdrsize, u32 pmtu, | |
1074 | int header_in_data) | |
1075 | { | |
3859e39d | 1076 | struct ipath_swqe *wqe; |
97f9efbc BS |
1077 | unsigned long flags; |
1078 | struct ib_wc wc; | |
1079 | int diff; | |
1080 | u32 pad; | |
1081 | u32 aeth; | |
1082 | ||
1083 | spin_lock_irqsave(&qp->s_lock, flags); | |
1084 | ||
1085 | /* Ignore invalid responses. */ | |
1086 | if (ipath_cmp24(psn, qp->s_next_psn) >= 0) | |
1087 | goto ack_done; | |
1088 | ||
1089 | /* Ignore duplicate responses. */ | |
1090 | diff = ipath_cmp24(psn, qp->s_last_psn); | |
1091 | if (unlikely(diff <= 0)) { | |
1092 | /* Update credits for "ghost" ACKs */ | |
1093 | if (diff == 0 && opcode == OP(ACKNOWLEDGE)) { | |
1094 | if (!header_in_data) | |
1095 | aeth = be32_to_cpu(ohdr->u.aeth); | |
1096 | else { | |
1097 | aeth = be32_to_cpu(((__be32 *) data)[0]); | |
1098 | data += sizeof(__be32); | |
1099 | } | |
1100 | if ((aeth >> 29) == 0) | |
1101 | ipath_get_credit(qp, aeth); | |
1102 | } | |
1103 | goto ack_done; | |
1104 | } | |
1105 | ||
3859e39d RC |
1106 | if (unlikely(qp->s_last == qp->s_tail)) |
1107 | goto ack_done; | |
1108 | wqe = get_swqe_ptr(qp, qp->s_last); | |
1109 | ||
97f9efbc BS |
1110 | switch (opcode) { |
1111 | case OP(ACKNOWLEDGE): | |
1112 | case OP(ATOMIC_ACKNOWLEDGE): | |
1113 | case OP(RDMA_READ_RESPONSE_FIRST): | |
1114 | if (!header_in_data) | |
1115 | aeth = be32_to_cpu(ohdr->u.aeth); | |
1116 | else { | |
1117 | aeth = be32_to_cpu(((__be32 *) data)[0]); | |
1118 | data += sizeof(__be32); | |
1119 | } | |
3859e39d RC |
1120 | if (opcode == OP(ATOMIC_ACKNOWLEDGE)) { |
1121 | u64 val; | |
1122 | ||
1123 | if (!header_in_data) { | |
1124 | __be32 *p = ohdr->u.at.atomic_ack_eth; | |
1125 | ||
1126 | val = ((u64) be32_to_cpu(p[0]) << 32) | | |
1127 | be32_to_cpu(p[1]); | |
1128 | } else | |
1129 | val = be64_to_cpu(((__be64 *) data)[0]); | |
1130 | *(u64 *) wqe->sg_list[0].vaddr = val; | |
1131 | } | |
97f9efbc BS |
1132 | if (!do_rc_ack(qp, aeth, psn, opcode) || |
1133 | opcode != OP(RDMA_READ_RESPONSE_FIRST)) | |
1134 | goto ack_done; | |
1135 | hdrsize += 4; | |
3859e39d | 1136 | if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) |
dd5190b6 | 1137 | goto ack_op_err; |
97f9efbc | 1138 | /* |
3859e39d RC |
1139 | * If this is a response to a resent RDMA read, we |
1140 | * have to be careful to copy the data to the right | |
1141 | * location. | |
97f9efbc | 1142 | */ |
3859e39d RC |
1143 | qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge, |
1144 | wqe, psn, pmtu); | |
1145 | goto read_middle; | |
97f9efbc BS |
1146 | |
1147 | case OP(RDMA_READ_RESPONSE_MIDDLE): | |
1148 | /* no AETH, no ACK */ | |
1149 | if (unlikely(ipath_cmp24(psn, qp->s_last_psn + 1))) { | |
1150 | dev->n_rdma_seq++; | |
3859e39d | 1151 | ipath_restart_rc(qp, qp->s_last_psn + 1, &wc); |
97f9efbc BS |
1152 | goto ack_done; |
1153 | } | |
3859e39d | 1154 | if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) |
dd5190b6 | 1155 | goto ack_op_err; |
3859e39d | 1156 | read_middle: |
7bbb15ea | 1157 | if (unlikely(tlen != (hdrsize + pmtu + 4))) |
dd5190b6 | 1158 | goto ack_len_err; |
3859e39d | 1159 | if (unlikely(pmtu >= qp->s_rdma_read_len)) |
dd5190b6 | 1160 | goto ack_len_err; |
3859e39d | 1161 | |
7bbb15ea | 1162 | /* We got a response so update the timeout. */ |
7bbb15ea BS |
1163 | spin_lock(&dev->pending_lock); |
1164 | if (qp->s_rnr_timeout == 0 && !list_empty(&qp->timerwait)) | |
1165 | list_move_tail(&qp->timerwait, | |
1166 | &dev->pending[dev->pending_index]); | |
1167 | spin_unlock(&dev->pending_lock); | |
1168 | /* | |
6700efdf BS |
1169 | * Update the RDMA receive state but do the copy w/o |
1170 | * holding the locks and blocking interrupts. | |
7bbb15ea | 1171 | */ |
3859e39d | 1172 | qp->s_rdma_read_len -= pmtu; |
6022943e | 1173 | update_last_psn(qp, psn); |
7bbb15ea | 1174 | spin_unlock_irqrestore(&qp->s_lock, flags); |
3859e39d | 1175 | ipath_copy_sge(&qp->s_rdma_read_sge, data, pmtu); |
7bbb15ea | 1176 | goto bail; |
97f9efbc | 1177 | |
3859e39d RC |
1178 | case OP(RDMA_READ_RESPONSE_ONLY): |
1179 | if (unlikely(ipath_cmp24(psn, qp->s_last_psn + 1))) { | |
1180 | dev->n_rdma_seq++; | |
1181 | ipath_restart_rc(qp, qp->s_last_psn + 1, &wc); | |
1182 | goto ack_done; | |
1183 | } | |
1184 | if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) | |
dd5190b6 RC |
1185 | goto ack_op_err; |
1186 | /* Get the number of bytes the message was padded by. */ | |
1187 | pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; | |
1188 | /* | |
1189 | * Check that the data size is >= 0 && <= pmtu. | |
1190 | * Remember to account for the AETH header (4) and | |
1191 | * ICRC (4). | |
1192 | */ | |
1193 | if (unlikely(tlen < (hdrsize + pad + 8))) | |
1194 | goto ack_len_err; | |
3859e39d RC |
1195 | /* |
1196 | * If this is a response to a resent RDMA read, we | |
1197 | * have to be careful to copy the data to the right | |
1198 | * location. | |
3859e39d RC |
1199 | */ |
1200 | qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge, | |
1201 | wqe, psn, pmtu); | |
1202 | goto read_last; | |
1203 | ||
97f9efbc BS |
1204 | case OP(RDMA_READ_RESPONSE_LAST): |
1205 | /* ACKs READ req. */ | |
1206 | if (unlikely(ipath_cmp24(psn, qp->s_last_psn + 1))) { | |
1207 | dev->n_rdma_seq++; | |
3859e39d | 1208 | ipath_restart_rc(qp, qp->s_last_psn + 1, &wc); |
97f9efbc BS |
1209 | goto ack_done; |
1210 | } | |
3859e39d | 1211 | if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) |
dd5190b6 RC |
1212 | goto ack_op_err; |
1213 | /* Get the number of bytes the message was padded by. */ | |
97f9efbc BS |
1214 | pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; |
1215 | /* | |
1216 | * Check that the data size is >= 1 && <= pmtu. | |
1217 | * Remember to account for the AETH header (4) and | |
1218 | * ICRC (4). | |
1219 | */ | |
dd5190b6 RC |
1220 | if (unlikely(tlen <= (hdrsize + pad + 8))) |
1221 | goto ack_len_err; | |
1222 | read_last: | |
97f9efbc | 1223 | tlen -= hdrsize + pad + 8; |
dd5190b6 RC |
1224 | if (unlikely(tlen != qp->s_rdma_read_len)) |
1225 | goto ack_len_err; | |
97f9efbc BS |
1226 | if (!header_in_data) |
1227 | aeth = be32_to_cpu(ohdr->u.aeth); | |
1228 | else { | |
1229 | aeth = be32_to_cpu(((__be32 *) data)[0]); | |
1230 | data += sizeof(__be32); | |
1231 | } | |
3859e39d RC |
1232 | ipath_copy_sge(&qp->s_rdma_read_sge, data, tlen); |
1233 | (void) do_rc_ack(qp, aeth, psn, OP(RDMA_READ_RESPONSE_LAST)); | |
97f9efbc BS |
1234 | goto ack_done; |
1235 | } | |
1236 | ||
1237 | ack_done: | |
1238 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
dd5190b6 RC |
1239 | goto bail; |
1240 | ||
1241 | ack_op_err: | |
1242 | wc.status = IB_WC_LOC_QP_OP_ERR; | |
1243 | goto ack_err; | |
1244 | ||
1245 | ack_len_err: | |
1246 | wc.status = IB_WC_LOC_LEN_ERR; | |
1247 | ack_err: | |
1248 | wc.wr_id = wqe->wr.wr_id; | |
1249 | wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode]; | |
1250 | wc.vendor_err = 0; | |
1251 | wc.byte_len = 0; | |
1252 | wc.imm_data = 0; | |
1253 | wc.qp = &qp->ibqp; | |
1254 | wc.src_qp = qp->remote_qpn; | |
1255 | wc.wc_flags = 0; | |
1256 | wc.pkey_index = 0; | |
1257 | wc.slid = qp->remote_ah_attr.dlid; | |
1258 | wc.sl = qp->remote_ah_attr.sl; | |
1259 | wc.dlid_path_bits = 0; | |
1260 | wc.port_num = 0; | |
1261 | ipath_sqerror_qp(qp, &wc); | |
6ed89b95 | 1262 | spin_unlock_irqrestore(&qp->s_lock, flags); |
97f9efbc BS |
1263 | bail: |
1264 | return; | |
1265 | } | |
1266 | ||
1267 | /** | |
1268 | * ipath_rc_rcv_error - process an incoming duplicate or error RC packet | |
1269 | * @dev: the device this packet came in on | |
1270 | * @ohdr: the other headers for this packet | |
1271 | * @data: the packet data | |
1272 | * @qp: the QP for this packet | |
1273 | * @opcode: the opcode for this packet | |
1274 | * @psn: the packet sequence number for this packet | |
1275 | * @diff: the difference between the PSN and the expected PSN | |
1276 | * @header_in_data: true if part of the header data is in the data buffer | |
1277 | * | |
1278 | * This is called from ipath_rc_rcv() to process an unexpected | |
1279 | * incoming RC packet for the given QP. | |
1280 | * Called at interrupt level. | |
1281 | * Return 1 if no more processing is needed; otherwise return 0 to | |
3859e39d | 1282 | * schedule a response to be sent. |
97f9efbc BS |
1283 | */ |
1284 | static inline int ipath_rc_rcv_error(struct ipath_ibdev *dev, | |
1285 | struct ipath_other_headers *ohdr, | |
1286 | void *data, | |
1287 | struct ipath_qp *qp, | |
1288 | u32 opcode, | |
1289 | u32 psn, | |
1290 | int diff, | |
1291 | int header_in_data) | |
1292 | { | |
3859e39d RC |
1293 | struct ipath_ack_entry *e; |
1294 | u8 i, prev; | |
1295 | int old_req; | |
35ff032e | 1296 | unsigned long flags; |
97f9efbc BS |
1297 | |
1298 | if (diff > 0) { | |
1299 | /* | |
1300 | * Packet sequence error. | |
1301 | * A NAK will ACK earlier sends and RDMA writes. | |
3859e39d | 1302 | * Don't queue the NAK if we already sent one. |
97f9efbc | 1303 | */ |
3859e39d | 1304 | if (!qp->r_nak_state) { |
12eef41f BS |
1305 | qp->r_nak_state = IB_NAK_PSN_ERROR; |
1306 | /* Use the expected PSN. */ | |
1307 | qp->r_ack_psn = qp->r_psn; | |
3859e39d | 1308 | goto send_ack; |
97f9efbc | 1309 | } |
3859e39d | 1310 | goto done; |
97f9efbc BS |
1311 | } |
1312 | ||
1313 | /* | |
1314 | * Handle a duplicate request. Don't re-execute SEND, RDMA | |
1315 | * write or atomic op. Don't NAK errors, just silently drop | |
1316 | * the duplicate request. Note that r_sge, r_len, and | |
1317 | * r_rcv_len may be in use so don't modify them. | |
1318 | * | |
1319 | * We are supposed to ACK the earliest duplicate PSN but we | |
1320 | * can coalesce an outstanding duplicate ACK. We have to | |
1321 | * send the earliest so that RDMA reads can be restarted at | |
1322 | * the requester's expected PSN. | |
3859e39d RC |
1323 | * |
1324 | * First, find where this duplicate PSN falls within the | |
1325 | * ACKs previously sent. | |
97f9efbc | 1326 | */ |
3859e39d RC |
1327 | psn &= IPATH_PSN_MASK; |
1328 | e = NULL; | |
1329 | old_req = 1; | |
35ff032e | 1330 | spin_lock_irqsave(&qp->s_lock, flags); |
3859e39d RC |
1331 | for (i = qp->r_head_ack_queue; ; i = prev) { |
1332 | if (i == qp->s_tail_ack_queue) | |
1333 | old_req = 0; | |
1334 | if (i) | |
1335 | prev = i - 1; | |
1336 | else | |
1337 | prev = IPATH_MAX_RDMA_ATOMIC; | |
1338 | if (prev == qp->r_head_ack_queue) { | |
1339 | e = NULL; | |
1340 | break; | |
1341 | } | |
1342 | e = &qp->s_ack_queue[prev]; | |
1343 | if (!e->opcode) { | |
1344 | e = NULL; | |
1345 | break; | |
1346 | } | |
1347 | if (ipath_cmp24(psn, e->psn) >= 0) | |
1348 | break; | |
1349 | } | |
1350 | switch (opcode) { | |
1351 | case OP(RDMA_READ_REQUEST): { | |
1352 | struct ib_reth *reth; | |
1353 | u32 offset; | |
1354 | u32 len; | |
1355 | ||
1356 | /* | |
1357 | * If we didn't find the RDMA read request in the ack queue, | |
1358 | * or the send tasklet is already backed up to send an | |
1359 | * earlier entry, we can ignore this request. | |
1360 | */ | |
1361 | if (!e || e->opcode != OP(RDMA_READ_REQUEST) || old_req) | |
1362 | goto unlock_done; | |
97f9efbc BS |
1363 | /* RETH comes after BTH */ |
1364 | if (!header_in_data) | |
1365 | reth = &ohdr->u.rc.reth; | |
1366 | else { | |
1367 | reth = (struct ib_reth *)data; | |
1368 | data += sizeof(*reth); | |
1369 | } | |
12eef41f | 1370 | /* |
3859e39d RC |
1371 | * Address range must be a subset of the original |
1372 | * request and start on pmtu boundaries. | |
1373 | * We reuse the old ack_queue slot since the requester | |
1374 | * should not back up and request an earlier PSN for the | |
1375 | * same request. | |
12eef41f | 1376 | */ |
3859e39d RC |
1377 | offset = ((psn - e->psn) & IPATH_PSN_MASK) * |
1378 | ib_mtu_enum_to_int(qp->path_mtu); | |
1379 | len = be32_to_cpu(reth->length); | |
1380 | if (unlikely(offset + len > e->rdma_sge.sge.sge_length)) | |
1381 | goto unlock_done; | |
1382 | if (len != 0) { | |
97f9efbc BS |
1383 | u32 rkey = be32_to_cpu(reth->rkey); |
1384 | u64 vaddr = be64_to_cpu(reth->vaddr); | |
1385 | int ok; | |
1386 | ||
3859e39d RC |
1387 | ok = ipath_rkey_ok(qp, &e->rdma_sge, |
1388 | len, vaddr, rkey, | |
97f9efbc | 1389 | IB_ACCESS_REMOTE_READ); |
3859e39d RC |
1390 | if (unlikely(!ok)) |
1391 | goto unlock_done; | |
97f9efbc | 1392 | } else { |
3859e39d RC |
1393 | e->rdma_sge.sg_list = NULL; |
1394 | e->rdma_sge.num_sge = 0; | |
1395 | e->rdma_sge.sge.mr = NULL; | |
1396 | e->rdma_sge.sge.vaddr = NULL; | |
1397 | e->rdma_sge.sge.length = 0; | |
1398 | e->rdma_sge.sge.sge_length = 0; | |
97f9efbc | 1399 | } |
3859e39d RC |
1400 | e->psn = psn; |
1401 | qp->s_ack_state = OP(ACKNOWLEDGE); | |
1402 | qp->s_tail_ack_queue = prev; | |
1403 | break; | |
12eef41f BS |
1404 | } |
1405 | ||
97f9efbc | 1406 | case OP(COMPARE_SWAP): |
3859e39d | 1407 | case OP(FETCH_ADD): { |
97f9efbc | 1408 | /* |
3859e39d RC |
1409 | * If we didn't find the atomic request in the ack queue |
1410 | * or the send tasklet is already backed up to send an | |
1411 | * earlier entry, we can ignore this request. | |
97f9efbc | 1412 | */ |
3859e39d RC |
1413 | if (!e || e->opcode != (u8) opcode || old_req) |
1414 | goto unlock_done; | |
1415 | qp->s_ack_state = OP(ACKNOWLEDGE); | |
1416 | qp->s_tail_ack_queue = prev; | |
1417 | break; | |
1418 | } | |
1419 | ||
1420 | default: | |
1421 | if (old_req) | |
1422 | goto unlock_done; | |
1423 | /* | |
1424 | * Resend the most recent ACK if this request is | |
1425 | * after all the previous RDMA reads and atomics. | |
1426 | */ | |
1427 | if (i == qp->r_head_ack_queue) { | |
35ff032e | 1428 | spin_unlock_irqrestore(&qp->s_lock, flags); |
3859e39d RC |
1429 | qp->r_nak_state = 0; |
1430 | qp->r_ack_psn = qp->r_psn - 1; | |
1431 | goto send_ack; | |
1432 | } | |
1433 | /* | |
1434 | * Resend the RDMA read or atomic op which | |
1435 | * ACKs this duplicate request. | |
1436 | */ | |
1437 | qp->s_ack_state = OP(ACKNOWLEDGE); | |
1438 | qp->s_tail_ack_queue = i; | |
97f9efbc BS |
1439 | break; |
1440 | } | |
12eef41f | 1441 | qp->r_nak_state = 0; |
3859e39d | 1442 | tasklet_hi_schedule(&qp->s_task); |
97f9efbc | 1443 | |
3859e39d | 1444 | unlock_done: |
35ff032e | 1445 | spin_unlock_irqrestore(&qp->s_lock, flags); |
97f9efbc BS |
1446 | done: |
1447 | return 1; | |
3859e39d RC |
1448 | |
1449 | send_ack: | |
1450 | return 0; | |
97f9efbc BS |
1451 | } |
1452 | ||
8d0208cb BS |
1453 | static void ipath_rc_error(struct ipath_qp *qp, enum ib_wc_status err) |
1454 | { | |
35ff032e RC |
1455 | unsigned long flags; |
1456 | ||
1457 | spin_lock_irqsave(&qp->s_lock, flags); | |
8d0208cb BS |
1458 | qp->state = IB_QPS_ERR; |
1459 | ipath_error_qp(qp, err); | |
35ff032e | 1460 | spin_unlock_irqrestore(&qp->s_lock, flags); |
8d0208cb BS |
1461 | } |
1462 | ||
97f9efbc BS |
1463 | /** |
1464 | * ipath_rc_rcv - process an incoming RC packet | |
1465 | * @dev: the device this packet came in on | |
1466 | * @hdr: the header of this packet | |
1467 | * @has_grh: true if the header has a GRH | |
1468 | * @data: the packet data | |
1469 | * @tlen: the packet length | |
1470 | * @qp: the QP for this packet | |
1471 | * | |
1472 | * This is called from ipath_qp_rcv() to process an incoming RC packet | |
1473 | * for the given QP. | |
1474 | * Called at interrupt level. | |
1475 | */ | |
1476 | void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr, | |
1477 | int has_grh, void *data, u32 tlen, struct ipath_qp *qp) | |
1478 | { | |
1479 | struct ipath_other_headers *ohdr; | |
1480 | u32 opcode; | |
1481 | u32 hdrsize; | |
1482 | u32 psn; | |
1483 | u32 pad; | |
97f9efbc BS |
1484 | struct ib_wc wc; |
1485 | u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu); | |
1486 | int diff; | |
1487 | struct ib_reth *reth; | |
1488 | int header_in_data; | |
1489 | ||
10aeb0e6 BS |
1490 | /* Validate the SLID. See Ch. 9.6.1.5 */ |
1491 | if (unlikely(be16_to_cpu(hdr->lrh[3]) != qp->remote_ah_attr.dlid)) | |
1492 | goto done; | |
1493 | ||
97f9efbc BS |
1494 | /* Check for GRH */ |
1495 | if (!has_grh) { | |
1496 | ohdr = &hdr->u.oth; | |
1497 | hdrsize = 8 + 12; /* LRH + BTH */ | |
1498 | psn = be32_to_cpu(ohdr->bth[2]); | |
1499 | header_in_data = 0; | |
1500 | } else { | |
1501 | ohdr = &hdr->u.l.oth; | |
1502 | hdrsize = 8 + 40 + 12; /* LRH + GRH + BTH */ | |
1503 | /* | |
1504 | * The header with GRH is 60 bytes and the core driver sets | |
1505 | * the eager header buffer size to 56 bytes so the last 4 | |
1506 | * bytes of the BTH header (PSN) is in the data buffer. | |
1507 | */ | |
34b2aafe | 1508 | header_in_data = dev->dd->ipath_rcvhdrentsize == 16; |
97f9efbc BS |
1509 | if (header_in_data) { |
1510 | psn = be32_to_cpu(((__be32 *) data)[0]); | |
1511 | data += sizeof(__be32); | |
1512 | } else | |
1513 | psn = be32_to_cpu(ohdr->bth[2]); | |
1514 | } | |
97f9efbc BS |
1515 | |
1516 | /* | |
1517 | * Process responses (ACKs) before anything else. Note that the | |
1518 | * packet sequence number will be for something in the send work | |
1519 | * queue rather than the expected receive packet sequence number. | |
1520 | * In other words, this QP is the requester. | |
1521 | */ | |
ddd4bb22 | 1522 | opcode = be32_to_cpu(ohdr->bth[0]) >> 24; |
97f9efbc BS |
1523 | if (opcode >= OP(RDMA_READ_RESPONSE_FIRST) && |
1524 | opcode <= OP(ATOMIC_ACKNOWLEDGE)) { | |
1525 | ipath_rc_rcv_resp(dev, ohdr, data, tlen, qp, opcode, psn, | |
1526 | hdrsize, pmtu, header_in_data); | |
12eef41f | 1527 | goto done; |
97f9efbc BS |
1528 | } |
1529 | ||
97f9efbc BS |
1530 | /* Compute 24 bits worth of difference. */ |
1531 | diff = ipath_cmp24(psn, qp->r_psn); | |
1532 | if (unlikely(diff)) { | |
1533 | if (ipath_rc_rcv_error(dev, ohdr, data, qp, opcode, | |
1534 | psn, diff, header_in_data)) | |
1535 | goto done; | |
12eef41f | 1536 | goto send_ack; |
97f9efbc BS |
1537 | } |
1538 | ||
1539 | /* Check for opcode sequence errors. */ | |
1540 | switch (qp->r_state) { | |
1541 | case OP(SEND_FIRST): | |
1542 | case OP(SEND_MIDDLE): | |
1543 | if (opcode == OP(SEND_MIDDLE) || | |
1544 | opcode == OP(SEND_LAST) || | |
1545 | opcode == OP(SEND_LAST_WITH_IMMEDIATE)) | |
1546 | break; | |
1547 | nack_inv: | |
8d0208cb | 1548 | ipath_rc_error(qp, IB_WC_REM_INV_REQ_ERR); |
12eef41f BS |
1549 | qp->r_nak_state = IB_NAK_INVALID_REQUEST; |
1550 | qp->r_ack_psn = qp->r_psn; | |
1551 | goto send_ack; | |
97f9efbc BS |
1552 | |
1553 | case OP(RDMA_WRITE_FIRST): | |
1554 | case OP(RDMA_WRITE_MIDDLE): | |
1555 | if (opcode == OP(RDMA_WRITE_MIDDLE) || | |
1556 | opcode == OP(RDMA_WRITE_LAST) || | |
1557 | opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) | |
1558 | break; | |
1559 | goto nack_inv; | |
1560 | ||
97f9efbc BS |
1561 | default: |
1562 | if (opcode == OP(SEND_MIDDLE) || | |
1563 | opcode == OP(SEND_LAST) || | |
1564 | opcode == OP(SEND_LAST_WITH_IMMEDIATE) || | |
1565 | opcode == OP(RDMA_WRITE_MIDDLE) || | |
1566 | opcode == OP(RDMA_WRITE_LAST) || | |
1567 | opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) | |
1568 | goto nack_inv; | |
12eef41f BS |
1569 | /* |
1570 | * Note that it is up to the requester to not send a new | |
1571 | * RDMA read or atomic operation before receiving an ACK | |
1572 | * for the previous operation. | |
1573 | */ | |
97f9efbc BS |
1574 | break; |
1575 | } | |
1576 | ||
1577 | wc.imm_data = 0; | |
1578 | wc.wc_flags = 0; | |
1579 | ||
1580 | /* OK, process the packet. */ | |
1581 | switch (opcode) { | |
1582 | case OP(SEND_FIRST): | |
1583 | if (!ipath_get_rwqe(qp, 0)) { | |
1584 | rnr_nak: | |
1585 | /* | |
1586 | * A RNR NAK will ACK earlier sends and RDMA writes. | |
1587 | * Don't queue the NAK if a RDMA read or atomic | |
1588 | * is pending though. | |
1589 | */ | |
3859e39d RC |
1590 | if (qp->r_nak_state) |
1591 | goto done; | |
12eef41f BS |
1592 | qp->r_nak_state = IB_RNR_NAK | qp->r_min_rnr_timer; |
1593 | qp->r_ack_psn = qp->r_psn; | |
1594 | goto send_ack; | |
97f9efbc BS |
1595 | } |
1596 | qp->r_rcv_len = 0; | |
1597 | /* FALLTHROUGH */ | |
1598 | case OP(SEND_MIDDLE): | |
1599 | case OP(RDMA_WRITE_MIDDLE): | |
1600 | send_middle: | |
1601 | /* Check for invalid length PMTU or posted rwqe len. */ | |
1602 | if (unlikely(tlen != (hdrsize + pmtu + 4))) | |
1603 | goto nack_inv; | |
1604 | qp->r_rcv_len += pmtu; | |
1605 | if (unlikely(qp->r_rcv_len > qp->r_len)) | |
1606 | goto nack_inv; | |
1607 | ipath_copy_sge(&qp->r_sge, data, pmtu); | |
1608 | break; | |
1609 | ||
1610 | case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE): | |
1611 | /* consume RWQE */ | |
1612 | if (!ipath_get_rwqe(qp, 1)) | |
1613 | goto rnr_nak; | |
1614 | goto send_last_imm; | |
1615 | ||
1616 | case OP(SEND_ONLY): | |
1617 | case OP(SEND_ONLY_WITH_IMMEDIATE): | |
1618 | if (!ipath_get_rwqe(qp, 0)) | |
1619 | goto rnr_nak; | |
1620 | qp->r_rcv_len = 0; | |
1621 | if (opcode == OP(SEND_ONLY)) | |
1622 | goto send_last; | |
1623 | /* FALLTHROUGH */ | |
1624 | case OP(SEND_LAST_WITH_IMMEDIATE): | |
1625 | send_last_imm: | |
1626 | if (header_in_data) { | |
1627 | wc.imm_data = *(__be32 *) data; | |
1628 | data += sizeof(__be32); | |
1629 | } else { | |
1630 | /* Immediate data comes after BTH */ | |
1631 | wc.imm_data = ohdr->u.imm_data; | |
1632 | } | |
1633 | hdrsize += 4; | |
1634 | wc.wc_flags = IB_WC_WITH_IMM; | |
1635 | /* FALLTHROUGH */ | |
1636 | case OP(SEND_LAST): | |
1637 | case OP(RDMA_WRITE_LAST): | |
1638 | send_last: | |
1639 | /* Get the number of bytes the message was padded by. */ | |
1640 | pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; | |
1641 | /* Check for invalid length. */ | |
1642 | /* XXX LAST len should be >= 1 */ | |
1643 | if (unlikely(tlen < (hdrsize + pad + 4))) | |
1644 | goto nack_inv; | |
1645 | /* Don't count the CRC. */ | |
1646 | tlen -= (hdrsize + pad + 4); | |
1647 | wc.byte_len = tlen + qp->r_rcv_len; | |
1648 | if (unlikely(wc.byte_len > qp->r_len)) | |
1649 | goto nack_inv; | |
1650 | ipath_copy_sge(&qp->r_sge, data, tlen); | |
12eef41f | 1651 | qp->r_msn++; |
8d0208cb | 1652 | if (!qp->r_wrid_valid) |
97f9efbc | 1653 | break; |
8d0208cb | 1654 | qp->r_wrid_valid = 0; |
97f9efbc BS |
1655 | wc.wr_id = qp->r_wr_id; |
1656 | wc.status = IB_WC_SUCCESS; | |
1657 | wc.opcode = IB_WC_RECV; | |
1658 | wc.vendor_err = 0; | |
062dbb69 | 1659 | wc.qp = &qp->ibqp; |
97f9efbc BS |
1660 | wc.src_qp = qp->remote_qpn; |
1661 | wc.pkey_index = 0; | |
1662 | wc.slid = qp->remote_ah_attr.dlid; | |
1663 | wc.sl = qp->remote_ah_attr.sl; | |
1664 | wc.dlid_path_bits = 0; | |
1665 | wc.port_num = 0; | |
1666 | /* Signal completion event if the solicited bit is set. */ | |
1667 | ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, | |
1668 | (ohdr->bth[0] & | |
1669 | __constant_cpu_to_be32(1 << 23)) != 0); | |
1670 | break; | |
1671 | ||
1672 | case OP(RDMA_WRITE_FIRST): | |
1673 | case OP(RDMA_WRITE_ONLY): | |
1674 | case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): | |
1675 | /* consume RWQE */ | |
1676 | /* RETH comes after BTH */ | |
1677 | if (!header_in_data) | |
1678 | reth = &ohdr->u.rc.reth; | |
1679 | else { | |
1680 | reth = (struct ib_reth *)data; | |
1681 | data += sizeof(*reth); | |
1682 | } | |
1683 | hdrsize += sizeof(*reth); | |
1684 | qp->r_len = be32_to_cpu(reth->length); | |
1685 | qp->r_rcv_len = 0; | |
1686 | if (qp->r_len != 0) { | |
1687 | u32 rkey = be32_to_cpu(reth->rkey); | |
1688 | u64 vaddr = be64_to_cpu(reth->vaddr); | |
1689 | int ok; | |
1690 | ||
1691 | /* Check rkey & NAK */ | |
6a553af2 | 1692 | ok = ipath_rkey_ok(qp, &qp->r_sge, |
97f9efbc BS |
1693 | qp->r_len, vaddr, rkey, |
1694 | IB_ACCESS_REMOTE_WRITE); | |
12eef41f BS |
1695 | if (unlikely(!ok)) |
1696 | goto nack_acc; | |
97f9efbc BS |
1697 | } else { |
1698 | qp->r_sge.sg_list = NULL; | |
1699 | qp->r_sge.sge.mr = NULL; | |
1700 | qp->r_sge.sge.vaddr = NULL; | |
1701 | qp->r_sge.sge.length = 0; | |
1702 | qp->r_sge.sge.sge_length = 0; | |
1703 | } | |
1704 | if (unlikely(!(qp->qp_access_flags & | |
1705 | IB_ACCESS_REMOTE_WRITE))) | |
1706 | goto nack_acc; | |
1707 | if (opcode == OP(RDMA_WRITE_FIRST)) | |
1708 | goto send_middle; | |
1709 | else if (opcode == OP(RDMA_WRITE_ONLY)) | |
1710 | goto send_last; | |
1711 | if (!ipath_get_rwqe(qp, 1)) | |
1712 | goto rnr_nak; | |
1713 | goto send_last_imm; | |
1714 | ||
3859e39d RC |
1715 | case OP(RDMA_READ_REQUEST): { |
1716 | struct ipath_ack_entry *e; | |
1717 | u32 len; | |
1718 | u8 next; | |
1719 | ||
1720 | if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ))) | |
1721 | goto nack_acc; | |
1722 | next = qp->r_head_ack_queue + 1; | |
1723 | if (next > IPATH_MAX_RDMA_ATOMIC) | |
1724 | next = 0; | |
1725 | if (unlikely(next == qp->s_tail_ack_queue)) | |
1726 | goto nack_inv; | |
1727 | e = &qp->s_ack_queue[qp->r_head_ack_queue]; | |
97f9efbc BS |
1728 | /* RETH comes after BTH */ |
1729 | if (!header_in_data) | |
1730 | reth = &ohdr->u.rc.reth; | |
1731 | else { | |
1732 | reth = (struct ib_reth *)data; | |
1733 | data += sizeof(*reth); | |
1734 | } | |
3859e39d RC |
1735 | len = be32_to_cpu(reth->length); |
1736 | if (len) { | |
97f9efbc BS |
1737 | u32 rkey = be32_to_cpu(reth->rkey); |
1738 | u64 vaddr = be64_to_cpu(reth->vaddr); | |
1739 | int ok; | |
1740 | ||
1741 | /* Check rkey & NAK */ | |
3859e39d RC |
1742 | ok = ipath_rkey_ok(qp, &e->rdma_sge, len, vaddr, |
1743 | rkey, IB_ACCESS_REMOTE_READ); | |
1744 | if (unlikely(!ok)) | |
97f9efbc | 1745 | goto nack_acc; |
97f9efbc BS |
1746 | /* |
1747 | * Update the next expected PSN. We add 1 later | |
1748 | * below, so only add the remainder here. | |
1749 | */ | |
3859e39d RC |
1750 | if (len > pmtu) |
1751 | qp->r_psn += (len - 1) / pmtu; | |
97f9efbc | 1752 | } else { |
3859e39d RC |
1753 | e->rdma_sge.sg_list = NULL; |
1754 | e->rdma_sge.num_sge = 0; | |
1755 | e->rdma_sge.sge.mr = NULL; | |
1756 | e->rdma_sge.sge.vaddr = NULL; | |
1757 | e->rdma_sge.sge.length = 0; | |
1758 | e->rdma_sge.sge.sge_length = 0; | |
97f9efbc | 1759 | } |
3859e39d RC |
1760 | e->opcode = opcode; |
1761 | e->psn = psn; | |
97f9efbc BS |
1762 | /* |
1763 | * We need to increment the MSN here instead of when we | |
1764 | * finish sending the result since a duplicate request would | |
1765 | * increment it more than once. | |
1766 | */ | |
12eef41f | 1767 | qp->r_msn++; |
97f9efbc BS |
1768 | qp->r_psn++; |
1769 | qp->r_state = opcode; | |
12eef41f | 1770 | qp->r_nak_state = 0; |
3859e39d RC |
1771 | barrier(); |
1772 | qp->r_head_ack_queue = next; | |
12eef41f BS |
1773 | |
1774 | /* Call ipath_do_rc_send() in another thread. */ | |
1775 | tasklet_hi_schedule(&qp->s_task); | |
1776 | ||
1777 | goto done; | |
3859e39d | 1778 | } |
97f9efbc BS |
1779 | |
1780 | case OP(COMPARE_SWAP): | |
1781 | case OP(FETCH_ADD): { | |
1782 | struct ib_atomic_eth *ateth; | |
3859e39d | 1783 | struct ipath_ack_entry *e; |
97f9efbc | 1784 | u64 vaddr; |
3859e39d | 1785 | atomic64_t *maddr; |
97f9efbc BS |
1786 | u64 sdata; |
1787 | u32 rkey; | |
3859e39d | 1788 | u8 next; |
97f9efbc | 1789 | |
3859e39d RC |
1790 | if (unlikely(!(qp->qp_access_flags & |
1791 | IB_ACCESS_REMOTE_ATOMIC))) | |
1792 | goto nack_acc; | |
1793 | next = qp->r_head_ack_queue + 1; | |
1794 | if (next > IPATH_MAX_RDMA_ATOMIC) | |
1795 | next = 0; | |
1796 | if (unlikely(next == qp->s_tail_ack_queue)) | |
1797 | goto nack_inv; | |
97f9efbc BS |
1798 | if (!header_in_data) |
1799 | ateth = &ohdr->u.atomic_eth; | |
3859e39d | 1800 | else |
97f9efbc | 1801 | ateth = (struct ib_atomic_eth *)data; |
3859e39d RC |
1802 | vaddr = ((u64) be32_to_cpu(ateth->vaddr[0]) << 32) | |
1803 | be32_to_cpu(ateth->vaddr[1]); | |
97f9efbc BS |
1804 | if (unlikely(vaddr & (sizeof(u64) - 1))) |
1805 | goto nack_inv; | |
1806 | rkey = be32_to_cpu(ateth->rkey); | |
1807 | /* Check rkey & NAK */ | |
6a553af2 | 1808 | if (unlikely(!ipath_rkey_ok(qp, &qp->r_sge, |
97f9efbc BS |
1809 | sizeof(u64), vaddr, rkey, |
1810 | IB_ACCESS_REMOTE_ATOMIC))) | |
1811 | goto nack_acc; | |
97f9efbc | 1812 | /* Perform atomic OP and save result. */ |
3859e39d | 1813 | maddr = (atomic64_t *) qp->r_sge.sge.vaddr; |
97f9efbc | 1814 | sdata = be64_to_cpu(ateth->swap_data); |
3859e39d RC |
1815 | e = &qp->s_ack_queue[qp->r_head_ack_queue]; |
1816 | e->atomic_data = (opcode == OP(FETCH_ADD)) ? | |
1817 | (u64) atomic64_add_return(sdata, maddr) - sdata : | |
1818 | (u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr, | |
1819 | be64_to_cpu(ateth->compare_data), | |
1820 | sdata); | |
1821 | e->opcode = opcode; | |
1822 | e->psn = psn & IPATH_PSN_MASK; | |
12eef41f | 1823 | qp->r_msn++; |
3859e39d RC |
1824 | qp->r_psn++; |
1825 | qp->r_state = opcode; | |
1826 | qp->r_nak_state = 0; | |
1827 | barrier(); | |
1828 | qp->r_head_ack_queue = next; | |
1829 | ||
1830 | /* Call ipath_do_rc_send() in another thread. */ | |
1831 | tasklet_hi_schedule(&qp->s_task); | |
1832 | ||
1833 | goto done; | |
97f9efbc BS |
1834 | } |
1835 | ||
1836 | default: | |
3859e39d RC |
1837 | /* NAK unknown opcodes. */ |
1838 | goto nack_inv; | |
97f9efbc BS |
1839 | } |
1840 | qp->r_psn++; | |
1841 | qp->r_state = opcode; | |
3859e39d | 1842 | qp->r_ack_psn = psn; |
12eef41f | 1843 | qp->r_nak_state = 0; |
97f9efbc | 1844 | /* Send an ACK if requested or required. */ |
3859e39d | 1845 | if (psn & (1 << 31)) |
12eef41f | 1846 | goto send_ack; |
12eef41f | 1847 | goto done; |
97f9efbc | 1848 | |
12eef41f | 1849 | nack_acc: |
3859e39d RC |
1850 | ipath_rc_error(qp, IB_WC_REM_ACCESS_ERR); |
1851 | qp->r_nak_state = IB_NAK_REMOTE_ACCESS_ERROR; | |
1852 | qp->r_ack_psn = qp->r_psn; | |
1853 | ||
12eef41f | 1854 | send_ack: |
3859e39d | 1855 | send_rc_ack(qp); |
97f9efbc | 1856 | |
12eef41f | 1857 | done: |
97f9efbc BS |
1858 | return; |
1859 | } |