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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 BS |
94 | |
95 | /* header size in 32-bit words LRH+BTH = (8+12)/4. */ | |
96 | hwords = 5; | |
97 | ||
97f9efbc | 98 | switch (qp->s_ack_state) { |
3859e39d RC |
99 | case OP(RDMA_READ_RESPONSE_LAST): |
100 | case OP(RDMA_READ_RESPONSE_ONLY): | |
101 | case OP(ATOMIC_ACKNOWLEDGE): | |
154257f3 RC |
102 | /* |
103 | * We can increment the tail pointer now that the last | |
104 | * response has been sent instead of only being | |
105 | * constructed. | |
106 | */ | |
107 | if (++qp->s_tail_ack_queue > IPATH_MAX_RDMA_ATOMIC) | |
108 | qp->s_tail_ack_queue = 0; | |
3859e39d | 109 | /* FALLTHROUGH */ |
154257f3 | 110 | case OP(SEND_ONLY): |
3859e39d RC |
111 | case OP(ACKNOWLEDGE): |
112 | /* Check for no next entry in the queue. */ | |
113 | if (qp->r_head_ack_queue == qp->s_tail_ack_queue) { | |
114 | if (qp->s_flags & IPATH_S_ACK_PENDING) | |
115 | goto normal; | |
154257f3 | 116 | qp->s_ack_state = OP(ACKNOWLEDGE); |
3859e39d RC |
117 | goto bail; |
118 | } | |
119 | ||
120 | e = &qp->s_ack_queue[qp->s_tail_ack_queue]; | |
121 | if (e->opcode == OP(RDMA_READ_REQUEST)) { | |
122 | /* Copy SGE state in case we need to resend */ | |
123 | qp->s_ack_rdma_sge = e->rdma_sge; | |
124 | qp->s_cur_sge = &qp->s_ack_rdma_sge; | |
125 | len = e->rdma_sge.sge.sge_length; | |
126 | if (len > pmtu) { | |
127 | len = pmtu; | |
128 | qp->s_ack_state = OP(RDMA_READ_RESPONSE_FIRST); | |
d781b129 | 129 | } else { |
3859e39d | 130 | qp->s_ack_state = OP(RDMA_READ_RESPONSE_ONLY); |
d781b129 RC |
131 | e->sent = 1; |
132 | } | |
3859e39d RC |
133 | ohdr->u.aeth = ipath_compute_aeth(qp); |
134 | hwords++; | |
135 | qp->s_ack_rdma_psn = e->psn; | |
136 | bth2 = qp->s_ack_rdma_psn++ & IPATH_PSN_MASK; | |
137 | } else { | |
138 | /* COMPARE_SWAP or FETCH_ADD */ | |
139 | qp->s_cur_sge = NULL; | |
140 | len = 0; | |
141 | qp->s_ack_state = OP(ATOMIC_ACKNOWLEDGE); | |
142 | ohdr->u.at.aeth = ipath_compute_aeth(qp); | |
143 | ohdr->u.at.atomic_ack_eth[0] = | |
144 | cpu_to_be32(e->atomic_data >> 32); | |
145 | ohdr->u.at.atomic_ack_eth[1] = | |
146 | cpu_to_be32(e->atomic_data); | |
147 | hwords += sizeof(ohdr->u.at) / sizeof(u32); | |
148 | bth2 = e->psn; | |
d781b129 | 149 | e->sent = 1; |
3859e39d | 150 | } |
97f9efbc | 151 | bth0 = qp->s_ack_state << 24; |
97f9efbc BS |
152 | break; |
153 | ||
154 | case OP(RDMA_READ_RESPONSE_FIRST): | |
155 | qp->s_ack_state = OP(RDMA_READ_RESPONSE_MIDDLE); | |
156 | /* FALLTHROUGH */ | |
157 | case OP(RDMA_READ_RESPONSE_MIDDLE): | |
3859e39d | 158 | len = qp->s_ack_rdma_sge.sge.sge_length; |
97f9efbc BS |
159 | if (len > pmtu) |
160 | len = pmtu; | |
161 | else { | |
162 | ohdr->u.aeth = ipath_compute_aeth(qp); | |
163 | hwords++; | |
164 | qp->s_ack_state = OP(RDMA_READ_RESPONSE_LAST); | |
d781b129 | 165 | qp->s_ack_queue[qp->s_tail_ack_queue].sent = 1; |
97f9efbc | 166 | } |
97f9efbc | 167 | bth0 = qp->s_ack_state << 24; |
3859e39d | 168 | bth2 = qp->s_ack_rdma_psn++ & IPATH_PSN_MASK; |
97f9efbc BS |
169 | break; |
170 | ||
171 | default: | |
3859e39d | 172 | normal: |
12eef41f | 173 | /* |
3859e39d RC |
174 | * Send a regular ACK. |
175 | * Set the s_ack_state so we wait until after sending | |
176 | * the ACK before setting s_ack_state to ACKNOWLEDGE | |
177 | * (see above). | |
12eef41f | 178 | */ |
154257f3 | 179 | qp->s_ack_state = OP(SEND_ONLY); |
3859e39d RC |
180 | qp->s_flags &= ~IPATH_S_ACK_PENDING; |
181 | qp->s_cur_sge = NULL; | |
12eef41f | 182 | if (qp->s_nak_state) |
3859e39d RC |
183 | ohdr->u.aeth = |
184 | cpu_to_be32((qp->r_msn & IPATH_MSN_MASK) | | |
185 | (qp->s_nak_state << | |
186 | IPATH_AETH_CREDIT_SHIFT)); | |
12eef41f BS |
187 | else |
188 | ohdr->u.aeth = ipath_compute_aeth(qp); | |
97f9efbc | 189 | hwords++; |
3859e39d RC |
190 | len = 0; |
191 | bth0 = OP(ACKNOWLEDGE) << 24; | |
192 | bth2 = qp->s_ack_psn & IPATH_PSN_MASK; | |
97f9efbc BS |
193 | } |
194 | qp->s_hdrwords = hwords; | |
97f9efbc | 195 | qp->s_cur_size = len; |
4ee97180 | 196 | ipath_make_ruc_header(dev, qp, ohdr, bth0, bth2); |
3859e39d | 197 | return 1; |
97f9efbc | 198 | |
12eef41f | 199 | bail: |
3859e39d | 200 | return 0; |
97f9efbc BS |
201 | } |
202 | ||
203 | /** | |
204 | * ipath_make_rc_req - construct a request packet (SEND, RDMA r/w, ATOMIC) | |
205 | * @qp: a pointer to the QP | |
97f9efbc BS |
206 | * |
207 | * Return 1 if constructed; otherwise, return 0. | |
97f9efbc | 208 | */ |
4ee97180 | 209 | int ipath_make_rc_req(struct ipath_qp *qp) |
97f9efbc BS |
210 | { |
211 | struct ipath_ibdev *dev = to_idev(qp->ibqp.device); | |
4ee97180 | 212 | struct ipath_other_headers *ohdr; |
97f9efbc BS |
213 | struct ipath_sge_state *ss; |
214 | struct ipath_swqe *wqe; | |
215 | u32 hwords; | |
216 | u32 len; | |
217 | u32 bth0; | |
218 | u32 bth2; | |
4ee97180 | 219 | u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu); |
97f9efbc | 220 | char newreq; |
4ee97180 RC |
221 | unsigned long flags; |
222 | int ret = 0; | |
223 | ||
224 | ohdr = &qp->s_hdr.u.oth; | |
225 | if (qp->remote_ah_attr.ah_flags & IB_AH_GRH) | |
226 | ohdr = &qp->s_hdr.u.l.oth; | |
227 | ||
228 | /* | |
229 | * The lock is needed to synchronize between the sending tasklet, | |
230 | * the receive interrupt handler, and timeout resends. | |
231 | */ | |
232 | spin_lock_irqsave(&qp->s_lock, flags); | |
97f9efbc | 233 | |
3859e39d RC |
234 | /* Sending responses has higher priority over sending requests. */ |
235 | if ((qp->r_head_ack_queue != qp->s_tail_ack_queue || | |
236 | (qp->s_flags & IPATH_S_ACK_PENDING) || | |
154257f3 | 237 | qp->s_ack_state != OP(ACKNOWLEDGE)) && |
4ee97180 | 238 | ipath_make_rc_ack(dev, qp, ohdr, pmtu)) |
3859e39d RC |
239 | goto done; |
240 | ||
97f9efbc | 241 | if (!(ib_ipath_state_ops[qp->state] & IPATH_PROCESS_SEND_OK) || |
c3af664a | 242 | qp->s_rnr_timeout || qp->s_wait_credit) |
3859e39d | 243 | goto bail; |
97f9efbc | 244 | |
6022943e BS |
245 | /* Limit the number of packets sent without an ACK. */ |
246 | if (ipath_cmp24(qp->s_psn, qp->s_last_psn + IPATH_PSN_CREDIT) > 0) { | |
247 | qp->s_wait_credit = 1; | |
248 | dev->n_rc_stalls++; | |
3859e39d | 249 | goto bail; |
6022943e BS |
250 | } |
251 | ||
97f9efbc BS |
252 | /* header size in 32-bit words LRH+BTH = (8+12)/4. */ |
253 | hwords = 5; | |
1dd6a1be | 254 | bth0 = 1 << 22; /* Set M bit */ |
97f9efbc BS |
255 | |
256 | /* Send a request. */ | |
257 | wqe = get_swqe_ptr(qp, qp->s_cur); | |
258 | switch (qp->s_state) { | |
259 | default: | |
260 | /* | |
261 | * Resend an old request or start a new one. | |
262 | * | |
263 | * We keep track of the current SWQE so that | |
264 | * we don't reset the "furthest progress" state | |
265 | * if we need to back up. | |
266 | */ | |
267 | newreq = 0; | |
268 | if (qp->s_cur == qp->s_tail) { | |
269 | /* Check if send work queue is empty. */ | |
270 | if (qp->s_tail == qp->s_head) | |
3859e39d RC |
271 | goto bail; |
272 | /* | |
273 | * If a fence is requested, wait for previous | |
274 | * RDMA read and atomic operations to finish. | |
275 | */ | |
276 | if ((wqe->wr.send_flags & IB_SEND_FENCE) && | |
277 | qp->s_num_rd_atomic) { | |
278 | qp->s_flags |= IPATH_S_FENCE_PENDING; | |
279 | goto bail; | |
280 | } | |
6022943e | 281 | wqe->psn = qp->s_next_psn; |
97f9efbc BS |
282 | newreq = 1; |
283 | } | |
284 | /* | |
285 | * Note that we have to be careful not to modify the | |
286 | * original work request since we may need to resend | |
287 | * it. | |
288 | */ | |
13b18c86 | 289 | len = wqe->length; |
97f9efbc BS |
290 | ss = &qp->s_sge; |
291 | bth2 = 0; | |
292 | switch (wqe->wr.opcode) { | |
293 | case IB_WR_SEND: | |
294 | case IB_WR_SEND_WITH_IMM: | |
295 | /* If no credit, return. */ | |
296 | if (qp->s_lsn != (u32) -1 && | |
297 | ipath_cmp24(wqe->ssn, qp->s_lsn + 1) > 0) | |
3859e39d | 298 | goto bail; |
97f9efbc BS |
299 | wqe->lpsn = wqe->psn; |
300 | if (len > pmtu) { | |
301 | wqe->lpsn += (len - 1) / pmtu; | |
302 | qp->s_state = OP(SEND_FIRST); | |
303 | len = pmtu; | |
304 | break; | |
305 | } | |
306 | if (wqe->wr.opcode == IB_WR_SEND) | |
307 | qp->s_state = OP(SEND_ONLY); | |
308 | else { | |
309 | qp->s_state = OP(SEND_ONLY_WITH_IMMEDIATE); | |
310 | /* Immediate data comes after the BTH */ | |
0f39cf3d | 311 | ohdr->u.imm_data = wqe->wr.ex.imm_data; |
97f9efbc BS |
312 | hwords += 1; |
313 | } | |
314 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
315 | bth0 |= 1 << 23; | |
316 | bth2 = 1 << 31; /* Request ACK. */ | |
317 | if (++qp->s_cur == qp->s_size) | |
318 | qp->s_cur = 0; | |
319 | break; | |
320 | ||
321 | case IB_WR_RDMA_WRITE: | |
6700efdf | 322 | if (newreq && qp->s_lsn != (u32) -1) |
97f9efbc BS |
323 | qp->s_lsn++; |
324 | /* FALLTHROUGH */ | |
325 | case IB_WR_RDMA_WRITE_WITH_IMM: | |
326 | /* If no credit, return. */ | |
327 | if (qp->s_lsn != (u32) -1 && | |
328 | ipath_cmp24(wqe->ssn, qp->s_lsn + 1) > 0) | |
3859e39d | 329 | goto bail; |
97f9efbc BS |
330 | ohdr->u.rc.reth.vaddr = |
331 | cpu_to_be64(wqe->wr.wr.rdma.remote_addr); | |
332 | ohdr->u.rc.reth.rkey = | |
333 | cpu_to_be32(wqe->wr.wr.rdma.rkey); | |
334 | ohdr->u.rc.reth.length = cpu_to_be32(len); | |
3859e39d | 335 | hwords += sizeof(struct ib_reth) / sizeof(u32); |
97f9efbc BS |
336 | wqe->lpsn = wqe->psn; |
337 | if (len > pmtu) { | |
338 | wqe->lpsn += (len - 1) / pmtu; | |
339 | qp->s_state = OP(RDMA_WRITE_FIRST); | |
340 | len = pmtu; | |
341 | break; | |
342 | } | |
343 | if (wqe->wr.opcode == IB_WR_RDMA_WRITE) | |
344 | qp->s_state = OP(RDMA_WRITE_ONLY); | |
345 | else { | |
346 | qp->s_state = | |
347 | OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE); | |
6700efdf | 348 | /* Immediate data comes after RETH */ |
0f39cf3d | 349 | ohdr->u.rc.imm_data = wqe->wr.ex.imm_data; |
97f9efbc BS |
350 | hwords += 1; |
351 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
352 | bth0 |= 1 << 23; | |
353 | } | |
354 | bth2 = 1 << 31; /* Request ACK. */ | |
355 | if (++qp->s_cur == qp->s_size) | |
356 | qp->s_cur = 0; | |
357 | break; | |
358 | ||
359 | case IB_WR_RDMA_READ: | |
3859e39d RC |
360 | /* |
361 | * Don't allow more operations to be started | |
362 | * than the QP limits allow. | |
363 | */ | |
97f9efbc | 364 | if (newreq) { |
3859e39d RC |
365 | if (qp->s_num_rd_atomic >= |
366 | qp->s_max_rd_atomic) { | |
367 | qp->s_flags |= IPATH_S_RDMAR_PENDING; | |
368 | goto bail; | |
369 | } | |
370 | qp->s_num_rd_atomic++; | |
6700efdf BS |
371 | if (qp->s_lsn != (u32) -1) |
372 | qp->s_lsn++; | |
97f9efbc BS |
373 | /* |
374 | * Adjust s_next_psn to count the | |
375 | * expected number of responses. | |
376 | */ | |
377 | if (len > pmtu) | |
378 | qp->s_next_psn += (len - 1) / pmtu; | |
379 | wqe->lpsn = qp->s_next_psn++; | |
380 | } | |
3859e39d RC |
381 | ohdr->u.rc.reth.vaddr = |
382 | cpu_to_be64(wqe->wr.wr.rdma.remote_addr); | |
383 | ohdr->u.rc.reth.rkey = | |
384 | cpu_to_be32(wqe->wr.wr.rdma.rkey); | |
385 | ohdr->u.rc.reth.length = cpu_to_be32(len); | |
386 | qp->s_state = OP(RDMA_READ_REQUEST); | |
387 | hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32); | |
97f9efbc BS |
388 | ss = NULL; |
389 | len = 0; | |
390 | if (++qp->s_cur == qp->s_size) | |
391 | qp->s_cur = 0; | |
392 | break; | |
393 | ||
394 | case IB_WR_ATOMIC_CMP_AND_SWP: | |
395 | case IB_WR_ATOMIC_FETCH_AND_ADD: | |
3859e39d RC |
396 | /* |
397 | * Don't allow more operations to be started | |
398 | * than the QP limits allow. | |
399 | */ | |
97f9efbc | 400 | if (newreq) { |
3859e39d RC |
401 | if (qp->s_num_rd_atomic >= |
402 | qp->s_max_rd_atomic) { | |
403 | qp->s_flags |= IPATH_S_RDMAR_PENDING; | |
404 | goto bail; | |
405 | } | |
406 | qp->s_num_rd_atomic++; | |
6700efdf BS |
407 | if (qp->s_lsn != (u32) -1) |
408 | qp->s_lsn++; | |
97f9efbc BS |
409 | wqe->lpsn = wqe->psn; |
410 | } | |
3859e39d RC |
411 | if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP) { |
412 | qp->s_state = OP(COMPARE_SWAP); | |
413 | ohdr->u.atomic_eth.swap_data = cpu_to_be64( | |
414 | wqe->wr.wr.atomic.swap); | |
415 | ohdr->u.atomic_eth.compare_data = cpu_to_be64( | |
416 | wqe->wr.wr.atomic.compare_add); | |
417 | } else { | |
418 | qp->s_state = OP(FETCH_ADD); | |
419 | ohdr->u.atomic_eth.swap_data = cpu_to_be64( | |
420 | wqe->wr.wr.atomic.compare_add); | |
421 | ohdr->u.atomic_eth.compare_data = 0; | |
422 | } | |
423 | ohdr->u.atomic_eth.vaddr[0] = cpu_to_be32( | |
424 | wqe->wr.wr.atomic.remote_addr >> 32); | |
425 | ohdr->u.atomic_eth.vaddr[1] = cpu_to_be32( | |
426 | wqe->wr.wr.atomic.remote_addr); | |
427 | ohdr->u.atomic_eth.rkey = cpu_to_be32( | |
428 | wqe->wr.wr.atomic.rkey); | |
429 | hwords += sizeof(struct ib_atomic_eth) / sizeof(u32); | |
97f9efbc BS |
430 | ss = NULL; |
431 | len = 0; | |
3859e39d RC |
432 | if (++qp->s_cur == qp->s_size) |
433 | qp->s_cur = 0; | |
97f9efbc BS |
434 | break; |
435 | ||
436 | default: | |
3859e39d | 437 | goto bail; |
97f9efbc | 438 | } |
13b18c86 RC |
439 | qp->s_sge.sge = wqe->sg_list[0]; |
440 | qp->s_sge.sg_list = wqe->sg_list + 1; | |
441 | qp->s_sge.num_sge = wqe->wr.num_sge; | |
442 | qp->s_len = wqe->length; | |
97f9efbc BS |
443 | if (newreq) { |
444 | qp->s_tail++; | |
445 | if (qp->s_tail >= qp->s_size) | |
446 | qp->s_tail = 0; | |
447 | } | |
13b18c86 RC |
448 | bth2 |= qp->s_psn & IPATH_PSN_MASK; |
449 | if (wqe->wr.opcode == IB_WR_RDMA_READ) | |
450 | qp->s_psn = wqe->lpsn + 1; | |
451 | else { | |
452 | qp->s_psn++; | |
6f5c4074 | 453 | if (ipath_cmp24(qp->s_psn, qp->s_next_psn) > 0) |
13b18c86 RC |
454 | qp->s_next_psn = qp->s_psn; |
455 | } | |
12eef41f BS |
456 | /* |
457 | * Put the QP on the pending list so lost ACKs will cause | |
458 | * a retry. More than one request can be pending so the | |
459 | * QP may already be on the dev->pending list. | |
460 | */ | |
97f9efbc | 461 | spin_lock(&dev->pending_lock); |
94b8d9f9 | 462 | if (list_empty(&qp->timerwait)) |
97f9efbc BS |
463 | list_add_tail(&qp->timerwait, |
464 | &dev->pending[dev->pending_index]); | |
465 | spin_unlock(&dev->pending_lock); | |
466 | break; | |
467 | ||
468 | case OP(RDMA_READ_RESPONSE_FIRST): | |
469 | /* | |
12eef41f BS |
470 | * This case can only happen if a send is restarted. |
471 | * See ipath_restart_rc(). | |
97f9efbc BS |
472 | */ |
473 | ipath_init_restart(qp, wqe); | |
474 | /* FALLTHROUGH */ | |
475 | case OP(SEND_FIRST): | |
476 | qp->s_state = OP(SEND_MIDDLE); | |
477 | /* FALLTHROUGH */ | |
478 | case OP(SEND_MIDDLE): | |
27b678dd | 479 | bth2 = qp->s_psn++ & IPATH_PSN_MASK; |
6f5c4074 | 480 | if (ipath_cmp24(qp->s_psn, qp->s_next_psn) > 0) |
97f9efbc BS |
481 | qp->s_next_psn = qp->s_psn; |
482 | ss = &qp->s_sge; | |
483 | len = qp->s_len; | |
484 | if (len > pmtu) { | |
97f9efbc BS |
485 | len = pmtu; |
486 | break; | |
487 | } | |
488 | if (wqe->wr.opcode == IB_WR_SEND) | |
489 | qp->s_state = OP(SEND_LAST); | |
490 | else { | |
491 | qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE); | |
492 | /* Immediate data comes after the BTH */ | |
0f39cf3d | 493 | ohdr->u.imm_data = wqe->wr.ex.imm_data; |
97f9efbc BS |
494 | hwords += 1; |
495 | } | |
496 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
497 | bth0 |= 1 << 23; | |
498 | bth2 |= 1 << 31; /* Request ACK. */ | |
499 | qp->s_cur++; | |
500 | if (qp->s_cur >= qp->s_size) | |
501 | qp->s_cur = 0; | |
502 | break; | |
503 | ||
504 | case OP(RDMA_READ_RESPONSE_LAST): | |
505 | /* | |
506 | * This case can only happen if a RDMA write is restarted. | |
507 | * See ipath_restart_rc(). | |
508 | */ | |
509 | ipath_init_restart(qp, wqe); | |
510 | /* FALLTHROUGH */ | |
511 | case OP(RDMA_WRITE_FIRST): | |
512 | qp->s_state = OP(RDMA_WRITE_MIDDLE); | |
513 | /* FALLTHROUGH */ | |
514 | case OP(RDMA_WRITE_MIDDLE): | |
27b678dd | 515 | bth2 = qp->s_psn++ & IPATH_PSN_MASK; |
6f5c4074 | 516 | if (ipath_cmp24(qp->s_psn, qp->s_next_psn) > 0) |
97f9efbc BS |
517 | qp->s_next_psn = qp->s_psn; |
518 | ss = &qp->s_sge; | |
519 | len = qp->s_len; | |
520 | if (len > pmtu) { | |
97f9efbc BS |
521 | len = pmtu; |
522 | break; | |
523 | } | |
524 | if (wqe->wr.opcode == IB_WR_RDMA_WRITE) | |
525 | qp->s_state = OP(RDMA_WRITE_LAST); | |
526 | else { | |
527 | qp->s_state = OP(RDMA_WRITE_LAST_WITH_IMMEDIATE); | |
528 | /* Immediate data comes after the BTH */ | |
0f39cf3d | 529 | ohdr->u.imm_data = wqe->wr.ex.imm_data; |
97f9efbc BS |
530 | hwords += 1; |
531 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
532 | bth0 |= 1 << 23; | |
533 | } | |
534 | bth2 |= 1 << 31; /* Request ACK. */ | |
535 | qp->s_cur++; | |
536 | if (qp->s_cur >= qp->s_size) | |
537 | qp->s_cur = 0; | |
538 | break; | |
539 | ||
540 | case OP(RDMA_READ_RESPONSE_MIDDLE): | |
541 | /* | |
542 | * This case can only happen if a RDMA read is restarted. | |
543 | * See ipath_restart_rc(). | |
544 | */ | |
545 | ipath_init_restart(qp, wqe); | |
27b678dd | 546 | len = ((qp->s_psn - wqe->psn) & IPATH_PSN_MASK) * pmtu; |
97f9efbc BS |
547 | ohdr->u.rc.reth.vaddr = |
548 | cpu_to_be64(wqe->wr.wr.rdma.remote_addr + len); | |
549 | ohdr->u.rc.reth.rkey = | |
550 | cpu_to_be32(wqe->wr.wr.rdma.rkey); | |
551 | ohdr->u.rc.reth.length = cpu_to_be32(qp->s_len); | |
552 | qp->s_state = OP(RDMA_READ_REQUEST); | |
3859e39d | 553 | hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32); |
27b678dd | 554 | bth2 = qp->s_psn++ & IPATH_PSN_MASK; |
6f5c4074 | 555 | if (ipath_cmp24(qp->s_psn, qp->s_next_psn) > 0) |
97f9efbc BS |
556 | qp->s_next_psn = qp->s_psn; |
557 | ss = NULL; | |
558 | len = 0; | |
559 | qp->s_cur++; | |
560 | if (qp->s_cur == qp->s_size) | |
561 | qp->s_cur = 0; | |
562 | break; | |
97f9efbc | 563 | } |
6022943e BS |
564 | if (ipath_cmp24(qp->s_psn, qp->s_last_psn + IPATH_PSN_CREDIT - 1) >= 0) |
565 | bth2 |= 1 << 31; /* Request ACK. */ | |
97f9efbc BS |
566 | qp->s_len -= len; |
567 | qp->s_hdrwords = hwords; | |
568 | qp->s_cur_sge = ss; | |
569 | qp->s_cur_size = len; | |
4ee97180 | 570 | ipath_make_ruc_header(dev, qp, ohdr, bth0 | (qp->s_state << 24), bth2); |
3859e39d | 571 | done: |
4ee97180 | 572 | ret = 1; |
3859e39d | 573 | bail: |
4ee97180 RC |
574 | spin_unlock_irqrestore(&qp->s_lock, flags); |
575 | return ret; | |
97f9efbc BS |
576 | } |
577 | ||
97f9efbc | 578 | /** |
ddd4bb22 BS |
579 | * send_rc_ack - Construct an ACK packet and send it |
580 | * @qp: a pointer to the QP | |
97f9efbc | 581 | * |
ddd4bb22 BS |
582 | * This is called from ipath_rc_rcv() and only uses the receive |
583 | * side QP state. | |
3859e39d RC |
584 | * Note that RDMA reads and atomics are handled in the |
585 | * send side QP state and tasklet. | |
97f9efbc | 586 | */ |
97f9efbc BS |
587 | static void send_rc_ack(struct ipath_qp *qp) |
588 | { | |
589 | struct ipath_ibdev *dev = to_idev(qp->ibqp.device); | |
d98b1937 | 590 | struct ipath_devdata *dd; |
97f9efbc BS |
591 | u16 lrh0; |
592 | u32 bth0; | |
ddd4bb22 | 593 | u32 hwords; |
d98b1937 | 594 | u32 __iomem *piobuf; |
ddd4bb22 | 595 | struct ipath_ib_header hdr; |
97f9efbc | 596 | struct ipath_other_headers *ohdr; |
35ff032e | 597 | unsigned long flags; |
97f9efbc | 598 | |
d98b1937 RC |
599 | spin_lock_irqsave(&qp->s_lock, flags); |
600 | ||
3859e39d | 601 | /* Don't send ACK or NAK if a RDMA read or atomic is pending. */ |
154257f3 RC |
602 | if (qp->r_head_ack_queue != qp->s_tail_ack_queue || |
603 | (qp->s_flags & IPATH_S_ACK_PENDING) || | |
604 | qp->s_ack_state != OP(ACKNOWLEDGE)) | |
3859e39d RC |
605 | goto queue_ack; |
606 | ||
d98b1937 RC |
607 | spin_unlock_irqrestore(&qp->s_lock, flags); |
608 | ||
609 | dd = dev->dd; | |
610 | piobuf = ipath_getpiobuf(dd, 0, NULL); | |
611 | if (!piobuf) { | |
612 | /* | |
613 | * We are out of PIO buffers at the moment. | |
614 | * Pass responsibility for sending the ACK to the | |
615 | * send tasklet so that when a PIO buffer becomes | |
616 | * available, the ACK is sent ahead of other outgoing | |
617 | * packets. | |
618 | */ | |
619 | spin_lock_irqsave(&qp->s_lock, flags); | |
620 | goto queue_ack; | |
621 | } | |
622 | ||
97f9efbc | 623 | /* Construct the header. */ |
ddd4bb22 | 624 | ohdr = &hdr.u.oth; |
27b678dd | 625 | lrh0 = IPATH_LRH_BTH; |
97f9efbc | 626 | /* header size in 32-bit words LRH+BTH+AETH = (8+12+4)/4. */ |
ddd4bb22 | 627 | hwords = 6; |
97f9efbc | 628 | if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) { |
ddd4bb22 BS |
629 | hwords += ipath_make_grh(dev, &hdr.u.l.grh, |
630 | &qp->remote_ah_attr.grh, | |
631 | hwords, 0); | |
632 | ohdr = &hdr.u.l.oth; | |
27b678dd | 633 | lrh0 = IPATH_LRH_GRH; |
97f9efbc | 634 | } |
12eef41f | 635 | /* read pkey_index w/o lock (its atomic) */ |
d98b1937 | 636 | bth0 = ipath_get_pkey(dd, qp->s_pkey_index) | |
1dd6a1be | 637 | (OP(ACKNOWLEDGE) << 24) | (1 << 22); |
12eef41f | 638 | if (qp->r_nak_state) |
27b678dd | 639 | ohdr->u.aeth = cpu_to_be32((qp->r_msn & IPATH_MSN_MASK) | |
12eef41f | 640 | (qp->r_nak_state << |
27b678dd | 641 | IPATH_AETH_CREDIT_SHIFT)); |
12eef41f BS |
642 | else |
643 | ohdr->u.aeth = ipath_compute_aeth(qp); | |
97f9efbc | 644 | lrh0 |= qp->remote_ah_attr.sl << 4; |
ddd4bb22 BS |
645 | hdr.lrh[0] = cpu_to_be16(lrh0); |
646 | hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); | |
647 | hdr.lrh[2] = cpu_to_be16(hwords + SIZE_OF_CRC); | |
d98b1937 | 648 | hdr.lrh[3] = cpu_to_be16(dd->ipath_lid); |
97f9efbc BS |
649 | ohdr->bth[0] = cpu_to_be32(bth0); |
650 | ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); | |
27b678dd | 651 | ohdr->bth[2] = cpu_to_be32(qp->r_ack_psn & IPATH_PSN_MASK); |
97f9efbc | 652 | |
d98b1937 | 653 | writeq(hwords + 1, piobuf); |
3859e39d | 654 | |
d98b1937 RC |
655 | if (dd->ipath_flags & IPATH_PIO_FLUSH_WC) { |
656 | u32 *hdrp = (u32 *) &hdr; | |
657 | ||
658 | ipath_flush_wc(); | |
659 | __iowrite32_copy(piobuf + 2, hdrp, hwords - 1); | |
660 | ipath_flush_wc(); | |
661 | __raw_writel(hdrp[hwords - 1], piobuf + hwords + 1); | |
662 | } else | |
663 | __iowrite32_copy(piobuf + 2, (u32 *) &hdr, hwords); | |
664 | ||
665 | ipath_flush_wc(); | |
666 | ||
667 | dev->n_unicast_xmit++; | |
668 | goto done; | |
3859e39d RC |
669 | |
670 | queue_ack: | |
cc65edcf | 671 | dev->n_rc_qacks++; |
3859e39d RC |
672 | qp->s_flags |= IPATH_S_ACK_PENDING; |
673 | qp->s_nak_state = qp->r_nak_state; | |
674 | qp->s_ack_psn = qp->r_ack_psn; | |
35ff032e | 675 | spin_unlock_irqrestore(&qp->s_lock, flags); |
3859e39d RC |
676 | |
677 | /* Call ipath_do_rc_send() in another thread. */ | |
678 | tasklet_hi_schedule(&qp->s_task); | |
679 | ||
680 | done: | |
681 | return; | |
97f9efbc BS |
682 | } |
683 | ||
6700efdf BS |
684 | /** |
685 | * reset_psn - reset the QP state to send starting from PSN | |
686 | * @qp: the QP | |
687 | * @psn: the packet sequence number to restart at | |
688 | * | |
689 | * This is called from ipath_rc_rcv() to process an incoming RC ACK | |
690 | * for the given QP. | |
691 | * Called at interrupt level with the QP s_lock held. | |
692 | */ | |
693 | static void reset_psn(struct ipath_qp *qp, u32 psn) | |
694 | { | |
695 | u32 n = qp->s_last; | |
696 | struct ipath_swqe *wqe = get_swqe_ptr(qp, n); | |
697 | u32 opcode; | |
698 | ||
699 | qp->s_cur = n; | |
700 | ||
701 | /* | |
702 | * If we are starting the request from the beginning, | |
703 | * let the normal send code handle initialization. | |
704 | */ | |
705 | if (ipath_cmp24(psn, wqe->psn) <= 0) { | |
706 | qp->s_state = OP(SEND_LAST); | |
707 | goto done; | |
708 | } | |
709 | ||
710 | /* Find the work request opcode corresponding to the given PSN. */ | |
711 | opcode = wqe->wr.opcode; | |
712 | for (;;) { | |
713 | int diff; | |
714 | ||
715 | if (++n == qp->s_size) | |
716 | n = 0; | |
717 | if (n == qp->s_tail) | |
718 | break; | |
719 | wqe = get_swqe_ptr(qp, n); | |
720 | diff = ipath_cmp24(psn, wqe->psn); | |
721 | if (diff < 0) | |
722 | break; | |
723 | qp->s_cur = n; | |
724 | /* | |
725 | * If we are starting the request from the beginning, | |
726 | * let the normal send code handle initialization. | |
727 | */ | |
728 | if (diff == 0) { | |
729 | qp->s_state = OP(SEND_LAST); | |
730 | goto done; | |
731 | } | |
732 | opcode = wqe->wr.opcode; | |
733 | } | |
734 | ||
735 | /* | |
736 | * Set the state to restart in the middle of a request. | |
737 | * Don't change the s_sge, s_cur_sge, or s_cur_size. | |
738 | * See ipath_do_rc_send(). | |
739 | */ | |
740 | switch (opcode) { | |
741 | case IB_WR_SEND: | |
742 | case IB_WR_SEND_WITH_IMM: | |
743 | qp->s_state = OP(RDMA_READ_RESPONSE_FIRST); | |
744 | break; | |
745 | ||
746 | case IB_WR_RDMA_WRITE: | |
747 | case IB_WR_RDMA_WRITE_WITH_IMM: | |
748 | qp->s_state = OP(RDMA_READ_RESPONSE_LAST); | |
749 | break; | |
750 | ||
751 | case IB_WR_RDMA_READ: | |
752 | qp->s_state = OP(RDMA_READ_RESPONSE_MIDDLE); | |
753 | break; | |
754 | ||
755 | default: | |
756 | /* | |
757 | * This case shouldn't happen since its only | |
758 | * one PSN per req. | |
759 | */ | |
760 | qp->s_state = OP(SEND_LAST); | |
761 | } | |
762 | done: | |
763 | qp->s_psn = psn; | |
764 | } | |
765 | ||
97f9efbc BS |
766 | /** |
767 | * ipath_restart_rc - back up requester to resend the last un-ACKed request | |
768 | * @qp: the QP to restart | |
769 | * @psn: packet sequence number for the request | |
770 | * @wc: the work completion request | |
771 | * | |
12eef41f | 772 | * The QP s_lock should be held and interrupts disabled. |
97f9efbc BS |
773 | */ |
774 | void ipath_restart_rc(struct ipath_qp *qp, u32 psn, struct ib_wc *wc) | |
775 | { | |
776 | struct ipath_swqe *wqe = get_swqe_ptr(qp, qp->s_last); | |
777 | struct ipath_ibdev *dev; | |
97f9efbc | 778 | |
97f9efbc BS |
779 | if (qp->s_retry == 0) { |
780 | wc->wr_id = wqe->wr.wr_id; | |
781 | wc->status = IB_WC_RETRY_EXC_ERR; | |
782 | wc->opcode = ib_ipath_wc_opcode[wqe->wr.opcode]; | |
783 | wc->vendor_err = 0; | |
784 | wc->byte_len = 0; | |
062dbb69 | 785 | wc->qp = &qp->ibqp; |
4ee97180 | 786 | wc->imm_data = 0; |
97f9efbc | 787 | wc->src_qp = qp->remote_qpn; |
4ee97180 | 788 | wc->wc_flags = 0; |
97f9efbc BS |
789 | wc->pkey_index = 0; |
790 | wc->slid = qp->remote_ah_attr.dlid; | |
791 | wc->sl = qp->remote_ah_attr.sl; | |
792 | wc->dlid_path_bits = 0; | |
793 | wc->port_num = 0; | |
794 | ipath_sqerror_qp(qp, wc); | |
795 | goto bail; | |
796 | } | |
797 | qp->s_retry--; | |
798 | ||
799 | /* | |
800 | * Remove the QP from the timeout queue. | |
801 | * Note: it may already have been removed by ipath_ib_timer(). | |
802 | */ | |
803 | dev = to_idev(qp->ibqp.device); | |
804 | spin_lock(&dev->pending_lock); | |
94b8d9f9 BS |
805 | if (!list_empty(&qp->timerwait)) |
806 | list_del_init(&qp->timerwait); | |
97f9efbc BS |
807 | spin_unlock(&dev->pending_lock); |
808 | ||
809 | if (wqe->wr.opcode == IB_WR_RDMA_READ) | |
810 | dev->n_rc_resends++; | |
811 | else | |
6f5c4074 | 812 | dev->n_rc_resends += (qp->s_psn - psn) & IPATH_PSN_MASK; |
97f9efbc | 813 | |
6700efdf | 814 | reset_psn(qp, psn); |
97f9efbc BS |
815 | tasklet_hi_schedule(&qp->s_task); |
816 | ||
817 | bail: | |
818 | return; | |
819 | } | |
820 | ||
6022943e BS |
821 | static inline void update_last_psn(struct ipath_qp *qp, u32 psn) |
822 | { | |
cc65edcf RC |
823 | if (qp->s_last_psn != psn) { |
824 | qp->s_last_psn = psn; | |
825 | if (qp->s_wait_credit) { | |
826 | qp->s_wait_credit = 0; | |
827 | tasklet_hi_schedule(&qp->s_task); | |
828 | } | |
6022943e | 829 | } |
6022943e BS |
830 | } |
831 | ||
97f9efbc BS |
832 | /** |
833 | * do_rc_ack - process an incoming RC ACK | |
834 | * @qp: the QP the ACK came in on | |
835 | * @psn: the packet sequence number of the ACK | |
836 | * @opcode: the opcode of the request that resulted in the ACK | |
837 | * | |
6700efdf | 838 | * This is called from ipath_rc_rcv_resp() to process an incoming RC ACK |
97f9efbc | 839 | * for the given QP. |
12eef41f | 840 | * Called at interrupt level with the QP s_lock held and interrupts disabled. |
97f9efbc BS |
841 | * Returns 1 if OK, 0 if current operation should be aborted (NAK). |
842 | */ | |
06ee1090 RC |
843 | static int do_rc_ack(struct ipath_qp *qp, u32 aeth, u32 psn, int opcode, |
844 | u64 val) | |
97f9efbc BS |
845 | { |
846 | struct ipath_ibdev *dev = to_idev(qp->ibqp.device); | |
847 | struct ib_wc wc; | |
848 | struct ipath_swqe *wqe; | |
849 | int ret = 0; | |
13b18c86 | 850 | u32 ack_psn; |
06ee1090 | 851 | int diff; |
97f9efbc BS |
852 | |
853 | /* | |
854 | * Remove the QP from the timeout queue (or RNR timeout queue). | |
855 | * If ipath_ib_timer() has already removed it, | |
856 | * it's OK since we hold the QP s_lock and ipath_restart_rc() | |
857 | * just won't find anything to restart if we ACK everything. | |
858 | */ | |
859 | spin_lock(&dev->pending_lock); | |
94b8d9f9 BS |
860 | if (!list_empty(&qp->timerwait)) |
861 | list_del_init(&qp->timerwait); | |
97f9efbc BS |
862 | spin_unlock(&dev->pending_lock); |
863 | ||
864 | /* | |
865 | * Note that NAKs implicitly ACK outstanding SEND and RDMA write | |
866 | * requests and implicitly NAK RDMA read and atomic requests issued | |
867 | * before the NAK'ed request. The MSN won't include the NAK'ed | |
868 | * request but will include an ACK'ed request(s). | |
869 | */ | |
13b18c86 RC |
870 | ack_psn = psn; |
871 | if (aeth >> 29) | |
872 | ack_psn--; | |
97f9efbc BS |
873 | wqe = get_swqe_ptr(qp, qp->s_last); |
874 | ||
97f9efbc BS |
875 | /* |
876 | * The MSN might be for a later WQE than the PSN indicates so | |
877 | * only complete WQEs that the PSN finishes. | |
878 | */ | |
06ee1090 RC |
879 | while ((diff = ipath_cmp24(ack_psn, wqe->lpsn)) >= 0) { |
880 | /* | |
881 | * RDMA_READ_RESPONSE_ONLY is a special case since | |
882 | * we want to generate completion events for everything | |
883 | * before the RDMA read, copy the data, then generate | |
884 | * the completion for the read. | |
885 | */ | |
886 | if (wqe->wr.opcode == IB_WR_RDMA_READ && | |
887 | opcode == OP(RDMA_READ_RESPONSE_ONLY) && | |
888 | diff == 0) { | |
889 | ret = 1; | |
890 | goto bail; | |
891 | } | |
97f9efbc BS |
892 | /* |
893 | * If this request is a RDMA read or atomic, and the ACK is | |
894 | * for a later operation, this ACK NAKs the RDMA read or | |
895 | * atomic. In other words, only a RDMA_READ_LAST or ONLY | |
896 | * can ACK a RDMA read and likewise for atomic ops. Note | |
897 | * that the NAK case can only happen if relaxed ordering is | |
898 | * used and requests are sent after an RDMA read or atomic | |
899 | * is sent but before the response is received. | |
900 | */ | |
901 | if ((wqe->wr.opcode == IB_WR_RDMA_READ && | |
06ee1090 | 902 | (opcode != OP(RDMA_READ_RESPONSE_LAST) || diff != 0)) || |
97f9efbc BS |
903 | ((wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || |
904 | wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) && | |
06ee1090 | 905 | (opcode != OP(ATOMIC_ACKNOWLEDGE) || diff != 0))) { |
97f9efbc BS |
906 | /* |
907 | * The last valid PSN seen is the previous | |
908 | * request's. | |
909 | */ | |
6022943e | 910 | update_last_psn(qp, wqe->psn - 1); |
97f9efbc BS |
911 | /* Retry this request. */ |
912 | ipath_restart_rc(qp, wqe->psn, &wc); | |
913 | /* | |
914 | * No need to process the ACK/NAK since we are | |
915 | * restarting an earlier request. | |
916 | */ | |
917 | goto bail; | |
918 | } | |
06ee1090 RC |
919 | if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || |
920 | wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) | |
921 | *(u64 *) wqe->sg_list[0].vaddr = val; | |
3859e39d RC |
922 | if (qp->s_num_rd_atomic && |
923 | (wqe->wr.opcode == IB_WR_RDMA_READ || | |
924 | wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || | |
925 | wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD)) { | |
926 | qp->s_num_rd_atomic--; | |
927 | /* Restart sending task if fence is complete */ | |
928 | if ((qp->s_flags & IPATH_S_FENCE_PENDING) && | |
929 | !qp->s_num_rd_atomic) { | |
930 | qp->s_flags &= ~IPATH_S_FENCE_PENDING; | |
931 | tasklet_hi_schedule(&qp->s_task); | |
932 | } else if (qp->s_flags & IPATH_S_RDMAR_PENDING) { | |
933 | qp->s_flags &= ~IPATH_S_RDMAR_PENDING; | |
934 | tasklet_hi_schedule(&qp->s_task); | |
935 | } | |
936 | } | |
97f9efbc | 937 | /* Post a send completion queue entry if requested. */ |
3859e39d | 938 | if (!(qp->s_flags & IPATH_S_SIGNAL_REQ_WR) || |
97f9efbc BS |
939 | (wqe->wr.send_flags & IB_SEND_SIGNALED)) { |
940 | wc.wr_id = wqe->wr.wr_id; | |
941 | wc.status = IB_WC_SUCCESS; | |
942 | wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode]; | |
943 | wc.vendor_err = 0; | |
944 | wc.byte_len = wqe->length; | |
0434d271 | 945 | wc.imm_data = 0; |
062dbb69 | 946 | wc.qp = &qp->ibqp; |
97f9efbc | 947 | wc.src_qp = qp->remote_qpn; |
0434d271 | 948 | wc.wc_flags = 0; |
97f9efbc BS |
949 | wc.pkey_index = 0; |
950 | wc.slid = qp->remote_ah_attr.dlid; | |
951 | wc.sl = qp->remote_ah_attr.sl; | |
952 | wc.dlid_path_bits = 0; | |
953 | wc.port_num = 0; | |
954 | ipath_cq_enter(to_icq(qp->ibqp.send_cq), &wc, 0); | |
955 | } | |
956 | qp->s_retry = qp->s_retry_cnt; | |
957 | /* | |
958 | * If we are completing a request which is in the process of | |
959 | * being resent, we can stop resending it since we know the | |
960 | * responder has already seen it. | |
961 | */ | |
962 | if (qp->s_last == qp->s_cur) { | |
963 | if (++qp->s_cur >= qp->s_size) | |
964 | qp->s_cur = 0; | |
6f5c4074 RC |
965 | qp->s_last = qp->s_cur; |
966 | if (qp->s_last == qp->s_tail) | |
967 | break; | |
97f9efbc BS |
968 | wqe = get_swqe_ptr(qp, qp->s_cur); |
969 | qp->s_state = OP(SEND_LAST); | |
970 | qp->s_psn = wqe->psn; | |
6f5c4074 RC |
971 | } else { |
972 | if (++qp->s_last >= qp->s_size) | |
973 | qp->s_last = 0; | |
974 | if (qp->s_last == qp->s_tail) | |
975 | break; | |
976 | wqe = get_swqe_ptr(qp, qp->s_last); | |
97f9efbc | 977 | } |
97f9efbc BS |
978 | } |
979 | ||
980 | switch (aeth >> 29) { | |
981 | case 0: /* ACK */ | |
982 | dev->n_rc_acks++; | |
983 | /* If this is a partial ACK, reset the retransmit timer. */ | |
984 | if (qp->s_last != qp->s_tail) { | |
985 | spin_lock(&dev->pending_lock); | |
f4ad1bcc RC |
986 | if (list_empty(&qp->timerwait)) |
987 | list_add_tail(&qp->timerwait, | |
988 | &dev->pending[dev->pending_index]); | |
97f9efbc | 989 | spin_unlock(&dev->pending_lock); |
6f5c4074 RC |
990 | /* |
991 | * If we get a partial ACK for a resent operation, | |
992 | * we can stop resending the earlier packets and | |
993 | * continue with the next packet the receiver wants. | |
994 | */ | |
995 | if (ipath_cmp24(qp->s_psn, psn) <= 0) { | |
996 | reset_psn(qp, psn + 1); | |
997 | tasklet_hi_schedule(&qp->s_task); | |
998 | } | |
999 | } else if (ipath_cmp24(qp->s_psn, psn) <= 0) { | |
1000 | qp->s_state = OP(SEND_LAST); | |
1001 | qp->s_psn = psn + 1; | |
97f9efbc BS |
1002 | } |
1003 | ipath_get_credit(qp, aeth); | |
1004 | qp->s_rnr_retry = qp->s_rnr_retry_cnt; | |
1005 | qp->s_retry = qp->s_retry_cnt; | |
6022943e | 1006 | update_last_psn(qp, psn); |
97f9efbc BS |
1007 | ret = 1; |
1008 | goto bail; | |
1009 | ||
1010 | case 1: /* RNR NAK */ | |
1011 | dev->n_rnr_naks++; | |
6f5c4074 RC |
1012 | if (qp->s_last == qp->s_tail) |
1013 | goto bail; | |
97f9efbc | 1014 | if (qp->s_rnr_retry == 0) { |
97f9efbc BS |
1015 | wc.status = IB_WC_RNR_RETRY_EXC_ERR; |
1016 | goto class_b; | |
1017 | } | |
1018 | if (qp->s_rnr_retry_cnt < 7) | |
1019 | qp->s_rnr_retry--; | |
97f9efbc | 1020 | |
6700efdf | 1021 | /* The last valid PSN is the previous PSN. */ |
6022943e | 1022 | update_last_psn(qp, psn - 1); |
97f9efbc | 1023 | |
6f5c4074 RC |
1024 | if (wqe->wr.opcode == IB_WR_RDMA_READ) |
1025 | dev->n_rc_resends++; | |
1026 | else | |
1027 | dev->n_rc_resends += | |
1028 | (qp->s_psn - psn) & IPATH_PSN_MASK; | |
97f9efbc | 1029 | |
6700efdf | 1030 | reset_psn(qp, psn); |
97f9efbc BS |
1031 | |
1032 | qp->s_rnr_timeout = | |
27b678dd BS |
1033 | ib_ipath_rnr_table[(aeth >> IPATH_AETH_CREDIT_SHIFT) & |
1034 | IPATH_AETH_CREDIT_MASK]; | |
97f9efbc BS |
1035 | ipath_insert_rnr_queue(qp); |
1036 | goto bail; | |
1037 | ||
1038 | case 3: /* NAK */ | |
6f5c4074 RC |
1039 | if (qp->s_last == qp->s_tail) |
1040 | goto bail; | |
1041 | /* The last valid PSN is the previous PSN. */ | |
1042 | update_last_psn(qp, psn - 1); | |
27b678dd BS |
1043 | switch ((aeth >> IPATH_AETH_CREDIT_SHIFT) & |
1044 | IPATH_AETH_CREDIT_MASK) { | |
97f9efbc BS |
1045 | case 0: /* PSN sequence error */ |
1046 | dev->n_seq_naks++; | |
1047 | /* | |
6f5c4074 | 1048 | * Back up to the responder's expected PSN. |
97f9efbc BS |
1049 | * Note that we might get a NAK in the middle of an |
1050 | * RDMA READ response which terminates the RDMA | |
1051 | * READ. | |
1052 | */ | |
97f9efbc BS |
1053 | ipath_restart_rc(qp, psn, &wc); |
1054 | break; | |
1055 | ||
1056 | case 1: /* Invalid Request */ | |
1057 | wc.status = IB_WC_REM_INV_REQ_ERR; | |
1058 | dev->n_other_naks++; | |
1059 | goto class_b; | |
1060 | ||
1061 | case 2: /* Remote Access Error */ | |
1062 | wc.status = IB_WC_REM_ACCESS_ERR; | |
1063 | dev->n_other_naks++; | |
1064 | goto class_b; | |
1065 | ||
1066 | case 3: /* Remote Operation Error */ | |
1067 | wc.status = IB_WC_REM_OP_ERR; | |
1068 | dev->n_other_naks++; | |
1069 | class_b: | |
1070 | wc.wr_id = wqe->wr.wr_id; | |
1071 | wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode]; | |
1072 | wc.vendor_err = 0; | |
1073 | wc.byte_len = 0; | |
062dbb69 | 1074 | wc.qp = &qp->ibqp; |
4ee97180 | 1075 | wc.imm_data = 0; |
97f9efbc | 1076 | wc.src_qp = qp->remote_qpn; |
4ee97180 | 1077 | wc.wc_flags = 0; |
97f9efbc BS |
1078 | wc.pkey_index = 0; |
1079 | wc.slid = qp->remote_ah_attr.dlid; | |
1080 | wc.sl = qp->remote_ah_attr.sl; | |
1081 | wc.dlid_path_bits = 0; | |
1082 | wc.port_num = 0; | |
1083 | ipath_sqerror_qp(qp, &wc); | |
1084 | break; | |
1085 | ||
1086 | default: | |
1087 | /* Ignore other reserved NAK error codes */ | |
1088 | goto reserved; | |
1089 | } | |
1090 | qp->s_rnr_retry = qp->s_rnr_retry_cnt; | |
1091 | goto bail; | |
1092 | ||
1093 | default: /* 2: reserved */ | |
1094 | reserved: | |
1095 | /* Ignore reserved NAK codes. */ | |
1096 | goto bail; | |
1097 | } | |
1098 | ||
1099 | bail: | |
1100 | return ret; | |
1101 | } | |
1102 | ||
1103 | /** | |
1104 | * ipath_rc_rcv_resp - process an incoming RC response packet | |
1105 | * @dev: the device this packet came in on | |
1106 | * @ohdr: the other headers for this packet | |
1107 | * @data: the packet data | |
1108 | * @tlen: the packet length | |
1109 | * @qp: the QP for this packet | |
1110 | * @opcode: the opcode for this packet | |
1111 | * @psn: the packet sequence number for this packet | |
1112 | * @hdrsize: the header length | |
1113 | * @pmtu: the path MTU | |
1114 | * @header_in_data: true if part of the header data is in the data buffer | |
1115 | * | |
1116 | * This is called from ipath_rc_rcv() to process an incoming RC response | |
1117 | * packet for the given QP. | |
1118 | * Called at interrupt level. | |
1119 | */ | |
1120 | static inline void ipath_rc_rcv_resp(struct ipath_ibdev *dev, | |
1121 | struct ipath_other_headers *ohdr, | |
1122 | void *data, u32 tlen, | |
1123 | struct ipath_qp *qp, | |
1124 | u32 opcode, | |
1125 | u32 psn, u32 hdrsize, u32 pmtu, | |
1126 | int header_in_data) | |
1127 | { | |
3859e39d | 1128 | struct ipath_swqe *wqe; |
97f9efbc BS |
1129 | unsigned long flags; |
1130 | struct ib_wc wc; | |
1131 | int diff; | |
1132 | u32 pad; | |
1133 | u32 aeth; | |
06ee1090 | 1134 | u64 val; |
97f9efbc BS |
1135 | |
1136 | spin_lock_irqsave(&qp->s_lock, flags); | |
1137 | ||
1138 | /* Ignore invalid responses. */ | |
1139 | if (ipath_cmp24(psn, qp->s_next_psn) >= 0) | |
1140 | goto ack_done; | |
1141 | ||
1142 | /* Ignore duplicate responses. */ | |
1143 | diff = ipath_cmp24(psn, qp->s_last_psn); | |
1144 | if (unlikely(diff <= 0)) { | |
1145 | /* Update credits for "ghost" ACKs */ | |
1146 | if (diff == 0 && opcode == OP(ACKNOWLEDGE)) { | |
1147 | if (!header_in_data) | |
1148 | aeth = be32_to_cpu(ohdr->u.aeth); | |
1149 | else { | |
1150 | aeth = be32_to_cpu(((__be32 *) data)[0]); | |
1151 | data += sizeof(__be32); | |
1152 | } | |
1153 | if ((aeth >> 29) == 0) | |
1154 | ipath_get_credit(qp, aeth); | |
1155 | } | |
1156 | goto ack_done; | |
1157 | } | |
1158 | ||
3859e39d RC |
1159 | if (unlikely(qp->s_last == qp->s_tail)) |
1160 | goto ack_done; | |
1161 | wqe = get_swqe_ptr(qp, qp->s_last); | |
1162 | ||
97f9efbc BS |
1163 | switch (opcode) { |
1164 | case OP(ACKNOWLEDGE): | |
1165 | case OP(ATOMIC_ACKNOWLEDGE): | |
1166 | case OP(RDMA_READ_RESPONSE_FIRST): | |
1167 | if (!header_in_data) | |
1168 | aeth = be32_to_cpu(ohdr->u.aeth); | |
1169 | else { | |
1170 | aeth = be32_to_cpu(((__be32 *) data)[0]); | |
1171 | data += sizeof(__be32); | |
1172 | } | |
3859e39d | 1173 | if (opcode == OP(ATOMIC_ACKNOWLEDGE)) { |
3859e39d RC |
1174 | if (!header_in_data) { |
1175 | __be32 *p = ohdr->u.at.atomic_ack_eth; | |
1176 | ||
1177 | val = ((u64) be32_to_cpu(p[0]) << 32) | | |
1178 | be32_to_cpu(p[1]); | |
1179 | } else | |
1180 | val = be64_to_cpu(((__be64 *) data)[0]); | |
06ee1090 RC |
1181 | } else |
1182 | val = 0; | |
1183 | if (!do_rc_ack(qp, aeth, psn, opcode, val) || | |
97f9efbc BS |
1184 | opcode != OP(RDMA_READ_RESPONSE_FIRST)) |
1185 | goto ack_done; | |
1186 | hdrsize += 4; | |
06ee1090 | 1187 | wqe = get_swqe_ptr(qp, qp->s_last); |
3859e39d | 1188 | if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) |
dd5190b6 | 1189 | goto ack_op_err; |
97f9efbc | 1190 | /* |
3859e39d RC |
1191 | * If this is a response to a resent RDMA read, we |
1192 | * have to be careful to copy the data to the right | |
1193 | * location. | |
97f9efbc | 1194 | */ |
3859e39d RC |
1195 | qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge, |
1196 | wqe, psn, pmtu); | |
1197 | goto read_middle; | |
97f9efbc BS |
1198 | |
1199 | case OP(RDMA_READ_RESPONSE_MIDDLE): | |
1200 | /* no AETH, no ACK */ | |
1201 | if (unlikely(ipath_cmp24(psn, qp->s_last_psn + 1))) { | |
1202 | dev->n_rdma_seq++; | |
3859e39d | 1203 | ipath_restart_rc(qp, qp->s_last_psn + 1, &wc); |
97f9efbc BS |
1204 | goto ack_done; |
1205 | } | |
3859e39d | 1206 | if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) |
dd5190b6 | 1207 | goto ack_op_err; |
3859e39d | 1208 | read_middle: |
7bbb15ea | 1209 | if (unlikely(tlen != (hdrsize + pmtu + 4))) |
dd5190b6 | 1210 | goto ack_len_err; |
3859e39d | 1211 | if (unlikely(pmtu >= qp->s_rdma_read_len)) |
dd5190b6 | 1212 | goto ack_len_err; |
3859e39d | 1213 | |
7bbb15ea | 1214 | /* We got a response so update the timeout. */ |
7bbb15ea BS |
1215 | spin_lock(&dev->pending_lock); |
1216 | if (qp->s_rnr_timeout == 0 && !list_empty(&qp->timerwait)) | |
1217 | list_move_tail(&qp->timerwait, | |
1218 | &dev->pending[dev->pending_index]); | |
1219 | spin_unlock(&dev->pending_lock); | |
450bb387 PML |
1220 | |
1221 | if (opcode == OP(RDMA_READ_RESPONSE_MIDDLE)) | |
1222 | qp->s_retry = qp->s_retry_cnt; | |
1223 | ||
7bbb15ea | 1224 | /* |
6700efdf BS |
1225 | * Update the RDMA receive state but do the copy w/o |
1226 | * holding the locks and blocking interrupts. | |
7bbb15ea | 1227 | */ |
3859e39d | 1228 | qp->s_rdma_read_len -= pmtu; |
6022943e | 1229 | update_last_psn(qp, psn); |
7bbb15ea | 1230 | spin_unlock_irqrestore(&qp->s_lock, flags); |
3859e39d | 1231 | ipath_copy_sge(&qp->s_rdma_read_sge, data, pmtu); |
7bbb15ea | 1232 | goto bail; |
97f9efbc | 1233 | |
3859e39d | 1234 | case OP(RDMA_READ_RESPONSE_ONLY): |
06ee1090 RC |
1235 | if (!header_in_data) |
1236 | aeth = be32_to_cpu(ohdr->u.aeth); | |
1237 | else | |
1238 | aeth = be32_to_cpu(((__be32 *) data)[0]); | |
1239 | if (!do_rc_ack(qp, aeth, psn, opcode, 0)) | |
3859e39d | 1240 | goto ack_done; |
dd5190b6 RC |
1241 | /* Get the number of bytes the message was padded by. */ |
1242 | pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; | |
1243 | /* | |
1244 | * Check that the data size is >= 0 && <= pmtu. | |
1245 | * Remember to account for the AETH header (4) and | |
1246 | * ICRC (4). | |
1247 | */ | |
1248 | if (unlikely(tlen < (hdrsize + pad + 8))) | |
1249 | goto ack_len_err; | |
3859e39d RC |
1250 | /* |
1251 | * If this is a response to a resent RDMA read, we | |
1252 | * have to be careful to copy the data to the right | |
1253 | * location. | |
3859e39d | 1254 | */ |
06ee1090 | 1255 | wqe = get_swqe_ptr(qp, qp->s_last); |
3859e39d RC |
1256 | qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge, |
1257 | wqe, psn, pmtu); | |
1258 | goto read_last; | |
1259 | ||
97f9efbc BS |
1260 | case OP(RDMA_READ_RESPONSE_LAST): |
1261 | /* ACKs READ req. */ | |
1262 | if (unlikely(ipath_cmp24(psn, qp->s_last_psn + 1))) { | |
1263 | dev->n_rdma_seq++; | |
3859e39d | 1264 | ipath_restart_rc(qp, qp->s_last_psn + 1, &wc); |
97f9efbc BS |
1265 | goto ack_done; |
1266 | } | |
3859e39d | 1267 | if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) |
dd5190b6 RC |
1268 | goto ack_op_err; |
1269 | /* Get the number of bytes the message was padded by. */ | |
97f9efbc BS |
1270 | pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; |
1271 | /* | |
1272 | * Check that the data size is >= 1 && <= pmtu. | |
1273 | * Remember to account for the AETH header (4) and | |
1274 | * ICRC (4). | |
1275 | */ | |
dd5190b6 RC |
1276 | if (unlikely(tlen <= (hdrsize + pad + 8))) |
1277 | goto ack_len_err; | |
1278 | read_last: | |
97f9efbc | 1279 | tlen -= hdrsize + pad + 8; |
dd5190b6 RC |
1280 | if (unlikely(tlen != qp->s_rdma_read_len)) |
1281 | goto ack_len_err; | |
97f9efbc BS |
1282 | if (!header_in_data) |
1283 | aeth = be32_to_cpu(ohdr->u.aeth); | |
1284 | else { | |
1285 | aeth = be32_to_cpu(((__be32 *) data)[0]); | |
1286 | data += sizeof(__be32); | |
1287 | } | |
3859e39d | 1288 | ipath_copy_sge(&qp->s_rdma_read_sge, data, tlen); |
06ee1090 RC |
1289 | (void) do_rc_ack(qp, aeth, psn, |
1290 | OP(RDMA_READ_RESPONSE_LAST), 0); | |
97f9efbc BS |
1291 | goto ack_done; |
1292 | } | |
1293 | ||
1294 | ack_done: | |
1295 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
dd5190b6 RC |
1296 | goto bail; |
1297 | ||
1298 | ack_op_err: | |
1299 | wc.status = IB_WC_LOC_QP_OP_ERR; | |
1300 | goto ack_err; | |
1301 | ||
1302 | ack_len_err: | |
1303 | wc.status = IB_WC_LOC_LEN_ERR; | |
1304 | ack_err: | |
1305 | wc.wr_id = wqe->wr.wr_id; | |
1306 | wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode]; | |
1307 | wc.vendor_err = 0; | |
1308 | wc.byte_len = 0; | |
1309 | wc.imm_data = 0; | |
1310 | wc.qp = &qp->ibqp; | |
1311 | wc.src_qp = qp->remote_qpn; | |
1312 | wc.wc_flags = 0; | |
1313 | wc.pkey_index = 0; | |
1314 | wc.slid = qp->remote_ah_attr.dlid; | |
1315 | wc.sl = qp->remote_ah_attr.sl; | |
1316 | wc.dlid_path_bits = 0; | |
1317 | wc.port_num = 0; | |
1318 | ipath_sqerror_qp(qp, &wc); | |
6ed89b95 | 1319 | spin_unlock_irqrestore(&qp->s_lock, flags); |
97f9efbc BS |
1320 | bail: |
1321 | return; | |
1322 | } | |
1323 | ||
1324 | /** | |
1325 | * ipath_rc_rcv_error - process an incoming duplicate or error RC packet | |
1326 | * @dev: the device this packet came in on | |
1327 | * @ohdr: the other headers for this packet | |
1328 | * @data: the packet data | |
1329 | * @qp: the QP for this packet | |
1330 | * @opcode: the opcode for this packet | |
1331 | * @psn: the packet sequence number for this packet | |
1332 | * @diff: the difference between the PSN and the expected PSN | |
1333 | * @header_in_data: true if part of the header data is in the data buffer | |
1334 | * | |
1335 | * This is called from ipath_rc_rcv() to process an unexpected | |
1336 | * incoming RC packet for the given QP. | |
1337 | * Called at interrupt level. | |
1338 | * Return 1 if no more processing is needed; otherwise return 0 to | |
3859e39d | 1339 | * schedule a response to be sent. |
97f9efbc BS |
1340 | */ |
1341 | static inline int ipath_rc_rcv_error(struct ipath_ibdev *dev, | |
1342 | struct ipath_other_headers *ohdr, | |
1343 | void *data, | |
1344 | struct ipath_qp *qp, | |
1345 | u32 opcode, | |
1346 | u32 psn, | |
1347 | int diff, | |
1348 | int header_in_data) | |
1349 | { | |
3859e39d RC |
1350 | struct ipath_ack_entry *e; |
1351 | u8 i, prev; | |
1352 | int old_req; | |
35ff032e | 1353 | unsigned long flags; |
97f9efbc BS |
1354 | |
1355 | if (diff > 0) { | |
1356 | /* | |
1357 | * Packet sequence error. | |
1358 | * A NAK will ACK earlier sends and RDMA writes. | |
3859e39d | 1359 | * Don't queue the NAK if we already sent one. |
97f9efbc | 1360 | */ |
3859e39d | 1361 | if (!qp->r_nak_state) { |
12eef41f BS |
1362 | qp->r_nak_state = IB_NAK_PSN_ERROR; |
1363 | /* Use the expected PSN. */ | |
1364 | qp->r_ack_psn = qp->r_psn; | |
3859e39d | 1365 | goto send_ack; |
97f9efbc | 1366 | } |
3859e39d | 1367 | goto done; |
97f9efbc BS |
1368 | } |
1369 | ||
1370 | /* | |
1371 | * Handle a duplicate request. Don't re-execute SEND, RDMA | |
1372 | * write or atomic op. Don't NAK errors, just silently drop | |
1373 | * the duplicate request. Note that r_sge, r_len, and | |
1374 | * r_rcv_len may be in use so don't modify them. | |
1375 | * | |
1376 | * We are supposed to ACK the earliest duplicate PSN but we | |
1377 | * can coalesce an outstanding duplicate ACK. We have to | |
1378 | * send the earliest so that RDMA reads can be restarted at | |
1379 | * the requester's expected PSN. | |
3859e39d RC |
1380 | * |
1381 | * First, find where this duplicate PSN falls within the | |
1382 | * ACKs previously sent. | |
97f9efbc | 1383 | */ |
3859e39d RC |
1384 | psn &= IPATH_PSN_MASK; |
1385 | e = NULL; | |
1386 | old_req = 1; | |
35ff032e | 1387 | spin_lock_irqsave(&qp->s_lock, flags); |
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; |
3859e39d | 1515 | tasklet_hi_schedule(&qp->s_task); |
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 | ||
8d0208cb BS |
1526 | static void ipath_rc_error(struct ipath_qp *qp, enum ib_wc_status err) |
1527 | { | |
35ff032e | 1528 | unsigned long flags; |
d42b01b5 | 1529 | int lastwqe; |
35ff032e RC |
1530 | |
1531 | spin_lock_irqsave(&qp->s_lock, flags); | |
8d0208cb | 1532 | qp->state = IB_QPS_ERR; |
d42b01b5 | 1533 | lastwqe = ipath_error_qp(qp, err); |
35ff032e | 1534 | spin_unlock_irqrestore(&qp->s_lock, flags); |
d42b01b5 RC |
1535 | |
1536 | if (lastwqe) { | |
1537 | struct ib_event ev; | |
1538 | ||
1539 | ev.device = qp->ibqp.device; | |
1540 | ev.element.qp = &qp->ibqp; | |
1541 | ev.event = IB_EVENT_QP_LAST_WQE_REACHED; | |
1542 | qp->ibqp.event_handler(&ev, qp->ibqp.qp_context); | |
1543 | } | |
8d0208cb BS |
1544 | } |
1545 | ||
d781b129 RC |
1546 | static inline void ipath_update_ack_queue(struct ipath_qp *qp, unsigned n) |
1547 | { | |
1548 | unsigned long flags; | |
1549 | unsigned next; | |
1550 | ||
1551 | next = n + 1; | |
1552 | if (next > IPATH_MAX_RDMA_ATOMIC) | |
1553 | next = 0; | |
1554 | spin_lock_irqsave(&qp->s_lock, flags); | |
1555 | if (n == qp->s_tail_ack_queue) { | |
1556 | qp->s_tail_ack_queue = next; | |
1557 | qp->s_ack_state = OP(ACKNOWLEDGE); | |
1558 | } | |
1559 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
1560 | } | |
1561 | ||
97f9efbc BS |
1562 | /** |
1563 | * ipath_rc_rcv - process an incoming RC packet | |
1564 | * @dev: the device this packet came in on | |
1565 | * @hdr: the header of this packet | |
1566 | * @has_grh: true if the header has a GRH | |
1567 | * @data: the packet data | |
1568 | * @tlen: the packet length | |
1569 | * @qp: the QP for this packet | |
1570 | * | |
1571 | * This is called from ipath_qp_rcv() to process an incoming RC packet | |
1572 | * for the given QP. | |
1573 | * Called at interrupt level. | |
1574 | */ | |
1575 | void ipath_rc_rcv(struct ipath_ibdev *dev, struct ipath_ib_header *hdr, | |
1576 | int has_grh, void *data, u32 tlen, struct ipath_qp *qp) | |
1577 | { | |
1578 | struct ipath_other_headers *ohdr; | |
1579 | u32 opcode; | |
1580 | u32 hdrsize; | |
1581 | u32 psn; | |
1582 | u32 pad; | |
97f9efbc BS |
1583 | struct ib_wc wc; |
1584 | u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu); | |
1585 | int diff; | |
1586 | struct ib_reth *reth; | |
1587 | int header_in_data; | |
1588 | ||
10aeb0e6 BS |
1589 | /* Validate the SLID. See Ch. 9.6.1.5 */ |
1590 | if (unlikely(be16_to_cpu(hdr->lrh[3]) != qp->remote_ah_attr.dlid)) | |
1591 | goto done; | |
1592 | ||
97f9efbc BS |
1593 | /* Check for GRH */ |
1594 | if (!has_grh) { | |
1595 | ohdr = &hdr->u.oth; | |
1596 | hdrsize = 8 + 12; /* LRH + BTH */ | |
1597 | psn = be32_to_cpu(ohdr->bth[2]); | |
1598 | header_in_data = 0; | |
1599 | } else { | |
1600 | ohdr = &hdr->u.l.oth; | |
1601 | hdrsize = 8 + 40 + 12; /* LRH + GRH + BTH */ | |
1602 | /* | |
1603 | * The header with GRH is 60 bytes and the core driver sets | |
1604 | * the eager header buffer size to 56 bytes so the last 4 | |
1605 | * bytes of the BTH header (PSN) is in the data buffer. | |
1606 | */ | |
34b2aafe | 1607 | header_in_data = dev->dd->ipath_rcvhdrentsize == 16; |
97f9efbc BS |
1608 | if (header_in_data) { |
1609 | psn = be32_to_cpu(((__be32 *) data)[0]); | |
1610 | data += sizeof(__be32); | |
1611 | } else | |
1612 | psn = be32_to_cpu(ohdr->bth[2]); | |
1613 | } | |
97f9efbc BS |
1614 | |
1615 | /* | |
1616 | * Process responses (ACKs) before anything else. Note that the | |
1617 | * packet sequence number will be for something in the send work | |
1618 | * queue rather than the expected receive packet sequence number. | |
1619 | * In other words, this QP is the requester. | |
1620 | */ | |
ddd4bb22 | 1621 | opcode = be32_to_cpu(ohdr->bth[0]) >> 24; |
97f9efbc BS |
1622 | if (opcode >= OP(RDMA_READ_RESPONSE_FIRST) && |
1623 | opcode <= OP(ATOMIC_ACKNOWLEDGE)) { | |
1624 | ipath_rc_rcv_resp(dev, ohdr, data, tlen, qp, opcode, psn, | |
1625 | hdrsize, pmtu, header_in_data); | |
12eef41f | 1626 | goto done; |
97f9efbc BS |
1627 | } |
1628 | ||
97f9efbc BS |
1629 | /* Compute 24 bits worth of difference. */ |
1630 | diff = ipath_cmp24(psn, qp->r_psn); | |
1631 | if (unlikely(diff)) { | |
1632 | if (ipath_rc_rcv_error(dev, ohdr, data, qp, opcode, | |
1633 | psn, diff, header_in_data)) | |
1634 | goto done; | |
12eef41f | 1635 | goto send_ack; |
97f9efbc BS |
1636 | } |
1637 | ||
1638 | /* Check for opcode sequence errors. */ | |
1639 | switch (qp->r_state) { | |
1640 | case OP(SEND_FIRST): | |
1641 | case OP(SEND_MIDDLE): | |
1642 | if (opcode == OP(SEND_MIDDLE) || | |
1643 | opcode == OP(SEND_LAST) || | |
1644 | opcode == OP(SEND_LAST_WITH_IMMEDIATE)) | |
1645 | break; | |
1646 | nack_inv: | |
8d0208cb | 1647 | ipath_rc_error(qp, IB_WC_REM_INV_REQ_ERR); |
12eef41f BS |
1648 | qp->r_nak_state = IB_NAK_INVALID_REQUEST; |
1649 | qp->r_ack_psn = qp->r_psn; | |
1650 | goto send_ack; | |
97f9efbc BS |
1651 | |
1652 | case OP(RDMA_WRITE_FIRST): | |
1653 | case OP(RDMA_WRITE_MIDDLE): | |
1654 | if (opcode == OP(RDMA_WRITE_MIDDLE) || | |
1655 | opcode == OP(RDMA_WRITE_LAST) || | |
1656 | opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) | |
1657 | break; | |
1658 | goto nack_inv; | |
1659 | ||
97f9efbc BS |
1660 | default: |
1661 | if (opcode == OP(SEND_MIDDLE) || | |
1662 | opcode == OP(SEND_LAST) || | |
1663 | opcode == OP(SEND_LAST_WITH_IMMEDIATE) || | |
1664 | opcode == OP(RDMA_WRITE_MIDDLE) || | |
1665 | opcode == OP(RDMA_WRITE_LAST) || | |
1666 | opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) | |
1667 | goto nack_inv; | |
12eef41f BS |
1668 | /* |
1669 | * Note that it is up to the requester to not send a new | |
1670 | * RDMA read or atomic operation before receiving an ACK | |
1671 | * for the previous operation. | |
1672 | */ | |
97f9efbc BS |
1673 | break; |
1674 | } | |
1675 | ||
1676 | wc.imm_data = 0; | |
1677 | wc.wc_flags = 0; | |
1678 | ||
1679 | /* OK, process the packet. */ | |
1680 | switch (opcode) { | |
1681 | case OP(SEND_FIRST): | |
1682 | if (!ipath_get_rwqe(qp, 0)) { | |
1683 | rnr_nak: | |
12eef41f BS |
1684 | qp->r_nak_state = IB_RNR_NAK | qp->r_min_rnr_timer; |
1685 | qp->r_ack_psn = qp->r_psn; | |
1686 | goto send_ack; | |
97f9efbc BS |
1687 | } |
1688 | qp->r_rcv_len = 0; | |
1689 | /* FALLTHROUGH */ | |
1690 | case OP(SEND_MIDDLE): | |
1691 | case OP(RDMA_WRITE_MIDDLE): | |
1692 | send_middle: | |
1693 | /* Check for invalid length PMTU or posted rwqe len. */ | |
1694 | if (unlikely(tlen != (hdrsize + pmtu + 4))) | |
1695 | goto nack_inv; | |
1696 | qp->r_rcv_len += pmtu; | |
1697 | if (unlikely(qp->r_rcv_len > qp->r_len)) | |
1698 | goto nack_inv; | |
1699 | ipath_copy_sge(&qp->r_sge, data, pmtu); | |
1700 | break; | |
1701 | ||
1702 | case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE): | |
1703 | /* consume RWQE */ | |
1704 | if (!ipath_get_rwqe(qp, 1)) | |
1705 | goto rnr_nak; | |
1706 | goto send_last_imm; | |
1707 | ||
1708 | case OP(SEND_ONLY): | |
1709 | case OP(SEND_ONLY_WITH_IMMEDIATE): | |
1710 | if (!ipath_get_rwqe(qp, 0)) | |
1711 | goto rnr_nak; | |
1712 | qp->r_rcv_len = 0; | |
1713 | if (opcode == OP(SEND_ONLY)) | |
1714 | goto send_last; | |
1715 | /* FALLTHROUGH */ | |
1716 | case OP(SEND_LAST_WITH_IMMEDIATE): | |
1717 | send_last_imm: | |
1718 | if (header_in_data) { | |
1719 | wc.imm_data = *(__be32 *) data; | |
1720 | data += sizeof(__be32); | |
1721 | } else { | |
1722 | /* Immediate data comes after BTH */ | |
1723 | wc.imm_data = ohdr->u.imm_data; | |
1724 | } | |
1725 | hdrsize += 4; | |
1726 | wc.wc_flags = IB_WC_WITH_IMM; | |
1727 | /* FALLTHROUGH */ | |
1728 | case OP(SEND_LAST): | |
1729 | case OP(RDMA_WRITE_LAST): | |
1730 | send_last: | |
1731 | /* Get the number of bytes the message was padded by. */ | |
1732 | pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; | |
1733 | /* Check for invalid length. */ | |
1734 | /* XXX LAST len should be >= 1 */ | |
1735 | if (unlikely(tlen < (hdrsize + pad + 4))) | |
1736 | goto nack_inv; | |
1737 | /* Don't count the CRC. */ | |
1738 | tlen -= (hdrsize + pad + 4); | |
1739 | wc.byte_len = tlen + qp->r_rcv_len; | |
1740 | if (unlikely(wc.byte_len > qp->r_len)) | |
1741 | goto nack_inv; | |
1742 | ipath_copy_sge(&qp->r_sge, data, tlen); | |
12eef41f | 1743 | qp->r_msn++; |
8d0208cb | 1744 | if (!qp->r_wrid_valid) |
97f9efbc | 1745 | break; |
8d0208cb | 1746 | qp->r_wrid_valid = 0; |
97f9efbc BS |
1747 | wc.wr_id = qp->r_wr_id; |
1748 | wc.status = IB_WC_SUCCESS; | |
1749 | wc.opcode = IB_WC_RECV; | |
1750 | wc.vendor_err = 0; | |
062dbb69 | 1751 | wc.qp = &qp->ibqp; |
97f9efbc BS |
1752 | wc.src_qp = qp->remote_qpn; |
1753 | wc.pkey_index = 0; | |
1754 | wc.slid = qp->remote_ah_attr.dlid; | |
1755 | wc.sl = qp->remote_ah_attr.sl; | |
1756 | wc.dlid_path_bits = 0; | |
1757 | wc.port_num = 0; | |
1758 | /* Signal completion event if the solicited bit is set. */ | |
1759 | ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, | |
1760 | (ohdr->bth[0] & | |
1761 | __constant_cpu_to_be32(1 << 23)) != 0); | |
1762 | break; | |
1763 | ||
1764 | case OP(RDMA_WRITE_FIRST): | |
1765 | case OP(RDMA_WRITE_ONLY): | |
1766 | case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): | |
b506e1dc RW |
1767 | if (unlikely(!(qp->qp_access_flags & |
1768 | IB_ACCESS_REMOTE_WRITE))) | |
1769 | goto nack_inv; | |
97f9efbc BS |
1770 | /* consume RWQE */ |
1771 | /* RETH comes after BTH */ | |
1772 | if (!header_in_data) | |
1773 | reth = &ohdr->u.rc.reth; | |
1774 | else { | |
1775 | reth = (struct ib_reth *)data; | |
1776 | data += sizeof(*reth); | |
1777 | } | |
1778 | hdrsize += sizeof(*reth); | |
1779 | qp->r_len = be32_to_cpu(reth->length); | |
1780 | qp->r_rcv_len = 0; | |
1781 | if (qp->r_len != 0) { | |
1782 | u32 rkey = be32_to_cpu(reth->rkey); | |
1783 | u64 vaddr = be64_to_cpu(reth->vaddr); | |
1784 | int ok; | |
1785 | ||
1786 | /* Check rkey & NAK */ | |
6a553af2 | 1787 | ok = ipath_rkey_ok(qp, &qp->r_sge, |
97f9efbc BS |
1788 | qp->r_len, vaddr, rkey, |
1789 | IB_ACCESS_REMOTE_WRITE); | |
12eef41f BS |
1790 | if (unlikely(!ok)) |
1791 | goto nack_acc; | |
97f9efbc BS |
1792 | } else { |
1793 | qp->r_sge.sg_list = NULL; | |
1794 | qp->r_sge.sge.mr = NULL; | |
1795 | qp->r_sge.sge.vaddr = NULL; | |
1796 | qp->r_sge.sge.length = 0; | |
1797 | qp->r_sge.sge.sge_length = 0; | |
1798 | } | |
97f9efbc BS |
1799 | if (opcode == OP(RDMA_WRITE_FIRST)) |
1800 | goto send_middle; | |
1801 | else if (opcode == OP(RDMA_WRITE_ONLY)) | |
1802 | goto send_last; | |
1803 | if (!ipath_get_rwqe(qp, 1)) | |
1804 | goto rnr_nak; | |
1805 | goto send_last_imm; | |
1806 | ||
3859e39d RC |
1807 | case OP(RDMA_READ_REQUEST): { |
1808 | struct ipath_ack_entry *e; | |
1809 | u32 len; | |
1810 | u8 next; | |
1811 | ||
b506e1dc RW |
1812 | if (unlikely(!(qp->qp_access_flags & |
1813 | IB_ACCESS_REMOTE_READ))) | |
1814 | goto nack_inv; | |
3859e39d RC |
1815 | next = qp->r_head_ack_queue + 1; |
1816 | if (next > IPATH_MAX_RDMA_ATOMIC) | |
1817 | next = 0; | |
d781b129 RC |
1818 | if (unlikely(next == qp->s_tail_ack_queue)) { |
1819 | if (!qp->s_ack_queue[next].sent) | |
1820 | goto nack_inv; | |
1821 | ipath_update_ack_queue(qp, next); | |
1822 | } | |
3859e39d | 1823 | e = &qp->s_ack_queue[qp->r_head_ack_queue]; |
97f9efbc BS |
1824 | /* RETH comes after BTH */ |
1825 | if (!header_in_data) | |
1826 | reth = &ohdr->u.rc.reth; | |
1827 | else { | |
1828 | reth = (struct ib_reth *)data; | |
1829 | data += sizeof(*reth); | |
1830 | } | |
3859e39d RC |
1831 | len = be32_to_cpu(reth->length); |
1832 | if (len) { | |
97f9efbc BS |
1833 | u32 rkey = be32_to_cpu(reth->rkey); |
1834 | u64 vaddr = be64_to_cpu(reth->vaddr); | |
1835 | int ok; | |
1836 | ||
1837 | /* Check rkey & NAK */ | |
3859e39d RC |
1838 | ok = ipath_rkey_ok(qp, &e->rdma_sge, len, vaddr, |
1839 | rkey, IB_ACCESS_REMOTE_READ); | |
1840 | if (unlikely(!ok)) | |
97f9efbc | 1841 | goto nack_acc; |
97f9efbc BS |
1842 | /* |
1843 | * Update the next expected PSN. We add 1 later | |
1844 | * below, so only add the remainder here. | |
1845 | */ | |
3859e39d RC |
1846 | if (len > pmtu) |
1847 | qp->r_psn += (len - 1) / pmtu; | |
97f9efbc | 1848 | } else { |
3859e39d RC |
1849 | e->rdma_sge.sg_list = NULL; |
1850 | e->rdma_sge.num_sge = 0; | |
1851 | e->rdma_sge.sge.mr = NULL; | |
1852 | e->rdma_sge.sge.vaddr = NULL; | |
1853 | e->rdma_sge.sge.length = 0; | |
1854 | e->rdma_sge.sge.sge_length = 0; | |
97f9efbc | 1855 | } |
3859e39d | 1856 | e->opcode = opcode; |
d781b129 | 1857 | e->sent = 0; |
3859e39d | 1858 | e->psn = psn; |
97f9efbc BS |
1859 | /* |
1860 | * We need to increment the MSN here instead of when we | |
1861 | * finish sending the result since a duplicate request would | |
1862 | * increment it more than once. | |
1863 | */ | |
12eef41f | 1864 | qp->r_msn++; |
97f9efbc BS |
1865 | qp->r_psn++; |
1866 | qp->r_state = opcode; | |
12eef41f | 1867 | qp->r_nak_state = 0; |
3859e39d RC |
1868 | barrier(); |
1869 | qp->r_head_ack_queue = next; | |
12eef41f BS |
1870 | |
1871 | /* Call ipath_do_rc_send() in another thread. */ | |
1872 | tasklet_hi_schedule(&qp->s_task); | |
1873 | ||
1874 | goto done; | |
3859e39d | 1875 | } |
97f9efbc BS |
1876 | |
1877 | case OP(COMPARE_SWAP): | |
1878 | case OP(FETCH_ADD): { | |
1879 | struct ib_atomic_eth *ateth; | |
3859e39d | 1880 | struct ipath_ack_entry *e; |
97f9efbc | 1881 | u64 vaddr; |
3859e39d | 1882 | atomic64_t *maddr; |
97f9efbc BS |
1883 | u64 sdata; |
1884 | u32 rkey; | |
3859e39d | 1885 | u8 next; |
97f9efbc | 1886 | |
3859e39d RC |
1887 | if (unlikely(!(qp->qp_access_flags & |
1888 | IB_ACCESS_REMOTE_ATOMIC))) | |
b506e1dc | 1889 | goto nack_inv; |
3859e39d RC |
1890 | next = qp->r_head_ack_queue + 1; |
1891 | if (next > IPATH_MAX_RDMA_ATOMIC) | |
1892 | next = 0; | |
d781b129 RC |
1893 | if (unlikely(next == qp->s_tail_ack_queue)) { |
1894 | if (!qp->s_ack_queue[next].sent) | |
1895 | goto nack_inv; | |
1896 | ipath_update_ack_queue(qp, next); | |
1897 | } | |
97f9efbc BS |
1898 | if (!header_in_data) |
1899 | ateth = &ohdr->u.atomic_eth; | |
3859e39d | 1900 | else |
97f9efbc | 1901 | ateth = (struct ib_atomic_eth *)data; |
3859e39d RC |
1902 | vaddr = ((u64) be32_to_cpu(ateth->vaddr[0]) << 32) | |
1903 | be32_to_cpu(ateth->vaddr[1]); | |
97f9efbc BS |
1904 | if (unlikely(vaddr & (sizeof(u64) - 1))) |
1905 | goto nack_inv; | |
1906 | rkey = be32_to_cpu(ateth->rkey); | |
1907 | /* Check rkey & NAK */ | |
6a553af2 | 1908 | if (unlikely(!ipath_rkey_ok(qp, &qp->r_sge, |
97f9efbc BS |
1909 | sizeof(u64), vaddr, rkey, |
1910 | IB_ACCESS_REMOTE_ATOMIC))) | |
1911 | goto nack_acc; | |
97f9efbc | 1912 | /* Perform atomic OP and save result. */ |
3859e39d | 1913 | maddr = (atomic64_t *) qp->r_sge.sge.vaddr; |
97f9efbc | 1914 | sdata = be64_to_cpu(ateth->swap_data); |
3859e39d RC |
1915 | e = &qp->s_ack_queue[qp->r_head_ack_queue]; |
1916 | e->atomic_data = (opcode == OP(FETCH_ADD)) ? | |
1917 | (u64) atomic64_add_return(sdata, maddr) - sdata : | |
1918 | (u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr, | |
1919 | be64_to_cpu(ateth->compare_data), | |
1920 | sdata); | |
1921 | e->opcode = opcode; | |
d781b129 | 1922 | e->sent = 0; |
3859e39d | 1923 | e->psn = psn & IPATH_PSN_MASK; |
12eef41f | 1924 | qp->r_msn++; |
3859e39d RC |
1925 | qp->r_psn++; |
1926 | qp->r_state = opcode; | |
1927 | qp->r_nak_state = 0; | |
1928 | barrier(); | |
1929 | qp->r_head_ack_queue = next; | |
1930 | ||
1931 | /* Call ipath_do_rc_send() in another thread. */ | |
1932 | tasklet_hi_schedule(&qp->s_task); | |
1933 | ||
1934 | goto done; | |
97f9efbc BS |
1935 | } |
1936 | ||
1937 | default: | |
3859e39d RC |
1938 | /* NAK unknown opcodes. */ |
1939 | goto nack_inv; | |
97f9efbc BS |
1940 | } |
1941 | qp->r_psn++; | |
1942 | qp->r_state = opcode; | |
3859e39d | 1943 | qp->r_ack_psn = psn; |
12eef41f | 1944 | qp->r_nak_state = 0; |
97f9efbc | 1945 | /* Send an ACK if requested or required. */ |
3859e39d | 1946 | if (psn & (1 << 31)) |
12eef41f | 1947 | goto send_ack; |
12eef41f | 1948 | goto done; |
97f9efbc | 1949 | |
12eef41f | 1950 | nack_acc: |
3859e39d RC |
1951 | ipath_rc_error(qp, IB_WC_REM_ACCESS_ERR); |
1952 | qp->r_nak_state = IB_NAK_REMOTE_ACCESS_ERROR; | |
1953 | qp->r_ack_psn = qp->r_psn; | |
1954 | ||
12eef41f | 1955 | send_ack: |
3859e39d | 1956 | send_rc_ack(qp); |
97f9efbc | 1957 | |
12eef41f | 1958 | done: |
97f9efbc BS |
1959 | return; |
1960 | } |