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f931551b RC |
1 | /* |
2 | * Copyright (c) 2006, 2007, 2008, 2009, 2010 QLogic Corporation. | |
3 | * All rights reserved. | |
4 | * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved. | |
5 | * | |
6 | * This software is available to you under a choice of one of two | |
7 | * licenses. You may choose to be licensed under the terms of the GNU | |
8 | * General Public License (GPL) Version 2, available from the file | |
9 | * COPYING in the main directory of this source tree, or the | |
10 | * OpenIB.org BSD license below: | |
11 | * | |
12 | * Redistribution and use in source and binary forms, with or | |
13 | * without modification, are permitted provided that the following | |
14 | * conditions are met: | |
15 | * | |
16 | * - Redistributions of source code must retain the above | |
17 | * copyright notice, this list of conditions and the following | |
18 | * disclaimer. | |
19 | * | |
20 | * - Redistributions in binary form must reproduce the above | |
21 | * copyright notice, this list of conditions and the following | |
22 | * disclaimer in the documentation and/or other materials | |
23 | * provided with the distribution. | |
24 | * | |
25 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
26 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
27 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
28 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
29 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
30 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
31 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
32 | * SOFTWARE. | |
33 | */ | |
34 | ||
35 | #include "qib.h" | |
36 | ||
37 | /* cut down ridiculously long IB macro names */ | |
38 | #define OP(x) IB_OPCODE_UC_##x | |
39 | ||
40 | /** | |
41 | * qib_make_uc_req - construct a request packet (SEND, RDMA write) | |
42 | * @qp: a pointer to the QP | |
43 | * | |
44 | * Return 1 if constructed; otherwise, return 0. | |
45 | */ | |
46 | int qib_make_uc_req(struct qib_qp *qp) | |
47 | { | |
48 | struct qib_other_headers *ohdr; | |
49 | struct qib_swqe *wqe; | |
50 | unsigned long flags; | |
51 | u32 hwords; | |
52 | u32 bth0; | |
53 | u32 len; | |
cc6ea138 | 54 | u32 pmtu = qp->pmtu; |
f931551b RC |
55 | int ret = 0; |
56 | ||
57 | spin_lock_irqsave(&qp->s_lock, flags); | |
58 | ||
59 | if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_SEND_OK)) { | |
60 | if (!(ib_qib_state_ops[qp->state] & QIB_FLUSH_SEND)) | |
61 | goto bail; | |
62 | /* We are in the error state, flush the work request. */ | |
63 | if (qp->s_last == qp->s_head) | |
64 | goto bail; | |
65 | /* If DMAs are in progress, we can't flush immediately. */ | |
66 | if (atomic_read(&qp->s_dma_busy)) { | |
67 | qp->s_flags |= QIB_S_WAIT_DMA; | |
68 | goto bail; | |
69 | } | |
70 | wqe = get_swqe_ptr(qp, qp->s_last); | |
71 | qib_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR); | |
72 | goto done; | |
73 | } | |
74 | ||
1c94283d | 75 | ohdr = &qp->s_hdr->u.oth; |
f931551b | 76 | if (qp->remote_ah_attr.ah_flags & IB_AH_GRH) |
1c94283d | 77 | ohdr = &qp->s_hdr->u.l.oth; |
f931551b RC |
78 | |
79 | /* header size in 32-bit words LRH+BTH = (8+12)/4. */ | |
80 | hwords = 5; | |
81 | bth0 = 0; | |
82 | ||
83 | /* Get the next send request. */ | |
84 | wqe = get_swqe_ptr(qp, qp->s_cur); | |
85 | qp->s_wqe = NULL; | |
86 | switch (qp->s_state) { | |
87 | default: | |
88 | if (!(ib_qib_state_ops[qp->state] & | |
89 | QIB_PROCESS_NEXT_SEND_OK)) | |
90 | goto bail; | |
91 | /* Check if send work queue is empty. */ | |
92 | if (qp->s_cur == qp->s_head) | |
93 | goto bail; | |
94 | /* | |
95 | * Start a new request. | |
96 | */ | |
97 | wqe->psn = qp->s_next_psn; | |
98 | qp->s_psn = qp->s_next_psn; | |
99 | qp->s_sge.sge = wqe->sg_list[0]; | |
100 | qp->s_sge.sg_list = wqe->sg_list + 1; | |
101 | qp->s_sge.num_sge = wqe->wr.num_sge; | |
102 | qp->s_sge.total_len = wqe->length; | |
103 | len = wqe->length; | |
104 | qp->s_len = len; | |
105 | switch (wqe->wr.opcode) { | |
106 | case IB_WR_SEND: | |
107 | case IB_WR_SEND_WITH_IMM: | |
108 | if (len > pmtu) { | |
109 | qp->s_state = OP(SEND_FIRST); | |
110 | len = pmtu; | |
111 | break; | |
112 | } | |
113 | if (wqe->wr.opcode == IB_WR_SEND) | |
114 | qp->s_state = OP(SEND_ONLY); | |
115 | else { | |
116 | qp->s_state = | |
117 | OP(SEND_ONLY_WITH_IMMEDIATE); | |
118 | /* Immediate data comes after the BTH */ | |
119 | ohdr->u.imm_data = wqe->wr.ex.imm_data; | |
120 | hwords += 1; | |
121 | } | |
122 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
123 | bth0 |= IB_BTH_SOLICITED; | |
124 | qp->s_wqe = wqe; | |
125 | if (++qp->s_cur >= qp->s_size) | |
126 | qp->s_cur = 0; | |
127 | break; | |
128 | ||
129 | case IB_WR_RDMA_WRITE: | |
130 | case IB_WR_RDMA_WRITE_WITH_IMM: | |
131 | ohdr->u.rc.reth.vaddr = | |
e622f2f4 | 132 | cpu_to_be64(wqe->rdma_wr.remote_addr); |
f931551b | 133 | ohdr->u.rc.reth.rkey = |
e622f2f4 | 134 | cpu_to_be32(wqe->rdma_wr.rkey); |
f931551b RC |
135 | ohdr->u.rc.reth.length = cpu_to_be32(len); |
136 | hwords += sizeof(struct ib_reth) / 4; | |
137 | if (len > pmtu) { | |
138 | qp->s_state = OP(RDMA_WRITE_FIRST); | |
139 | len = pmtu; | |
140 | break; | |
141 | } | |
142 | if (wqe->wr.opcode == IB_WR_RDMA_WRITE) | |
143 | qp->s_state = OP(RDMA_WRITE_ONLY); | |
144 | else { | |
145 | qp->s_state = | |
146 | OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE); | |
147 | /* Immediate data comes after the RETH */ | |
148 | ohdr->u.rc.imm_data = wqe->wr.ex.imm_data; | |
149 | hwords += 1; | |
150 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
151 | bth0 |= IB_BTH_SOLICITED; | |
152 | } | |
153 | qp->s_wqe = wqe; | |
154 | if (++qp->s_cur >= qp->s_size) | |
155 | qp->s_cur = 0; | |
156 | break; | |
157 | ||
158 | default: | |
159 | goto bail; | |
160 | } | |
161 | break; | |
162 | ||
163 | case OP(SEND_FIRST): | |
164 | qp->s_state = OP(SEND_MIDDLE); | |
165 | /* FALLTHROUGH */ | |
166 | case OP(SEND_MIDDLE): | |
167 | len = qp->s_len; | |
168 | if (len > pmtu) { | |
169 | len = pmtu; | |
170 | break; | |
171 | } | |
172 | if (wqe->wr.opcode == IB_WR_SEND) | |
173 | qp->s_state = OP(SEND_LAST); | |
174 | else { | |
175 | qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE); | |
176 | /* Immediate data comes after the BTH */ | |
177 | ohdr->u.imm_data = wqe->wr.ex.imm_data; | |
178 | hwords += 1; | |
179 | } | |
180 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
181 | bth0 |= IB_BTH_SOLICITED; | |
182 | qp->s_wqe = wqe; | |
183 | if (++qp->s_cur >= qp->s_size) | |
184 | qp->s_cur = 0; | |
185 | break; | |
186 | ||
187 | case OP(RDMA_WRITE_FIRST): | |
188 | qp->s_state = OP(RDMA_WRITE_MIDDLE); | |
189 | /* FALLTHROUGH */ | |
190 | case OP(RDMA_WRITE_MIDDLE): | |
191 | len = qp->s_len; | |
192 | if (len > pmtu) { | |
193 | len = pmtu; | |
194 | break; | |
195 | } | |
196 | if (wqe->wr.opcode == IB_WR_RDMA_WRITE) | |
197 | qp->s_state = OP(RDMA_WRITE_LAST); | |
198 | else { | |
199 | qp->s_state = | |
200 | OP(RDMA_WRITE_LAST_WITH_IMMEDIATE); | |
201 | /* Immediate data comes after the BTH */ | |
202 | ohdr->u.imm_data = wqe->wr.ex.imm_data; | |
203 | hwords += 1; | |
204 | if (wqe->wr.send_flags & IB_SEND_SOLICITED) | |
205 | bth0 |= IB_BTH_SOLICITED; | |
206 | } | |
207 | qp->s_wqe = wqe; | |
208 | if (++qp->s_cur >= qp->s_size) | |
209 | qp->s_cur = 0; | |
210 | break; | |
211 | } | |
212 | qp->s_len -= len; | |
213 | qp->s_hdrwords = hwords; | |
214 | qp->s_cur_sge = &qp->s_sge; | |
215 | qp->s_cur_size = len; | |
216 | qib_make_ruc_header(qp, ohdr, bth0 | (qp->s_state << 24), | |
217 | qp->s_next_psn++ & QIB_PSN_MASK); | |
218 | done: | |
219 | ret = 1; | |
220 | goto unlock; | |
221 | ||
222 | bail: | |
223 | qp->s_flags &= ~QIB_S_BUSY; | |
224 | unlock: | |
225 | spin_unlock_irqrestore(&qp->s_lock, flags); | |
226 | return ret; | |
227 | } | |
228 | ||
229 | /** | |
230 | * qib_uc_rcv - handle an incoming UC packet | |
231 | * @ibp: the port the packet came in on | |
232 | * @hdr: the header of the packet | |
233 | * @has_grh: true if the packet has a GRH | |
234 | * @data: the packet data | |
235 | * @tlen: the length of the packet | |
236 | * @qp: the QP for this packet. | |
237 | * | |
238 | * This is called from qib_qp_rcv() to process an incoming UC packet | |
239 | * for the given QP. | |
240 | * Called at interrupt level. | |
241 | */ | |
242 | void qib_uc_rcv(struct qib_ibport *ibp, struct qib_ib_header *hdr, | |
243 | int has_grh, void *data, u32 tlen, struct qib_qp *qp) | |
244 | { | |
245 | struct qib_other_headers *ohdr; | |
f931551b RC |
246 | u32 opcode; |
247 | u32 hdrsize; | |
248 | u32 psn; | |
249 | u32 pad; | |
250 | struct ib_wc wc; | |
cc6ea138 | 251 | u32 pmtu = qp->pmtu; |
f931551b RC |
252 | struct ib_reth *reth; |
253 | int ret; | |
254 | ||
255 | /* Check for GRH */ | |
256 | if (!has_grh) { | |
257 | ohdr = &hdr->u.oth; | |
258 | hdrsize = 8 + 12; /* LRH + BTH */ | |
259 | } else { | |
260 | ohdr = &hdr->u.l.oth; | |
261 | hdrsize = 8 + 40 + 12; /* LRH + GRH + BTH */ | |
262 | } | |
263 | ||
264 | opcode = be32_to_cpu(ohdr->bth[0]); | |
f931551b | 265 | if (qib_ruc_check_hdr(ibp, hdr, has_grh, qp, opcode)) |
9fd5473d | 266 | return; |
f931551b RC |
267 | |
268 | psn = be32_to_cpu(ohdr->bth[2]); | |
269 | opcode >>= 24; | |
f931551b | 270 | |
f931551b RC |
271 | /* Compare the PSN verses the expected PSN. */ |
272 | if (unlikely(qib_cmp24(psn, qp->r_psn) != 0)) { | |
273 | /* | |
274 | * Handle a sequence error. | |
275 | * Silently drop any current message. | |
276 | */ | |
277 | qp->r_psn = psn; | |
278 | inv: | |
279 | if (qp->r_state == OP(SEND_FIRST) || | |
280 | qp->r_state == OP(SEND_MIDDLE)) { | |
281 | set_bit(QIB_R_REWIND_SGE, &qp->r_aflags); | |
282 | qp->r_sge.num_sge = 0; | |
283 | } else | |
6a82649f | 284 | qib_put_ss(&qp->r_sge); |
f931551b RC |
285 | qp->r_state = OP(SEND_LAST); |
286 | switch (opcode) { | |
287 | case OP(SEND_FIRST): | |
288 | case OP(SEND_ONLY): | |
289 | case OP(SEND_ONLY_WITH_IMMEDIATE): | |
290 | goto send_first; | |
291 | ||
292 | case OP(RDMA_WRITE_FIRST): | |
293 | case OP(RDMA_WRITE_ONLY): | |
294 | case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): | |
295 | goto rdma_first; | |
296 | ||
297 | default: | |
298 | goto drop; | |
299 | } | |
300 | } | |
301 | ||
302 | /* Check for opcode sequence errors. */ | |
303 | switch (qp->r_state) { | |
304 | case OP(SEND_FIRST): | |
305 | case OP(SEND_MIDDLE): | |
306 | if (opcode == OP(SEND_MIDDLE) || | |
307 | opcode == OP(SEND_LAST) || | |
308 | opcode == OP(SEND_LAST_WITH_IMMEDIATE)) | |
309 | break; | |
310 | goto inv; | |
311 | ||
312 | case OP(RDMA_WRITE_FIRST): | |
313 | case OP(RDMA_WRITE_MIDDLE): | |
314 | if (opcode == OP(RDMA_WRITE_MIDDLE) || | |
315 | opcode == OP(RDMA_WRITE_LAST) || | |
316 | opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) | |
317 | break; | |
318 | goto inv; | |
319 | ||
320 | default: | |
321 | if (opcode == OP(SEND_FIRST) || | |
322 | opcode == OP(SEND_ONLY) || | |
323 | opcode == OP(SEND_ONLY_WITH_IMMEDIATE) || | |
324 | opcode == OP(RDMA_WRITE_FIRST) || | |
325 | opcode == OP(RDMA_WRITE_ONLY) || | |
326 | opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) | |
327 | break; | |
328 | goto inv; | |
329 | } | |
330 | ||
331 | if (qp->state == IB_QPS_RTR && !(qp->r_flags & QIB_R_COMM_EST)) { | |
332 | qp->r_flags |= QIB_R_COMM_EST; | |
333 | if (qp->ibqp.event_handler) { | |
334 | struct ib_event ev; | |
335 | ||
336 | ev.device = qp->ibqp.device; | |
337 | ev.element.qp = &qp->ibqp; | |
338 | ev.event = IB_EVENT_COMM_EST; | |
339 | qp->ibqp.event_handler(&ev, qp->ibqp.qp_context); | |
340 | } | |
341 | } | |
342 | ||
343 | /* OK, process the packet. */ | |
344 | switch (opcode) { | |
345 | case OP(SEND_FIRST): | |
346 | case OP(SEND_ONLY): | |
347 | case OP(SEND_ONLY_WITH_IMMEDIATE): | |
348 | send_first: | |
349 | if (test_and_clear_bit(QIB_R_REWIND_SGE, &qp->r_aflags)) | |
350 | qp->r_sge = qp->s_rdma_read_sge; | |
351 | else { | |
352 | ret = qib_get_rwqe(qp, 0); | |
353 | if (ret < 0) | |
354 | goto op_err; | |
355 | if (!ret) | |
356 | goto drop; | |
357 | /* | |
358 | * qp->s_rdma_read_sge will be the owner | |
359 | * of the mr references. | |
360 | */ | |
361 | qp->s_rdma_read_sge = qp->r_sge; | |
362 | } | |
363 | qp->r_rcv_len = 0; | |
364 | if (opcode == OP(SEND_ONLY)) | |
2fc109c8 | 365 | goto no_immediate_data; |
f931551b RC |
366 | else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE)) |
367 | goto send_last_imm; | |
368 | /* FALLTHROUGH */ | |
369 | case OP(SEND_MIDDLE): | |
370 | /* Check for invalid length PMTU or posted rwqe len. */ | |
371 | if (unlikely(tlen != (hdrsize + pmtu + 4))) | |
372 | goto rewind; | |
373 | qp->r_rcv_len += pmtu; | |
374 | if (unlikely(qp->r_rcv_len > qp->r_len)) | |
375 | goto rewind; | |
376 | qib_copy_sge(&qp->r_sge, data, pmtu, 0); | |
377 | break; | |
378 | ||
379 | case OP(SEND_LAST_WITH_IMMEDIATE): | |
380 | send_last_imm: | |
381 | wc.ex.imm_data = ohdr->u.imm_data; | |
382 | hdrsize += 4; | |
383 | wc.wc_flags = IB_WC_WITH_IMM; | |
2fc109c8 | 384 | goto send_last; |
f931551b | 385 | case OP(SEND_LAST): |
2fc109c8 MM |
386 | no_immediate_data: |
387 | wc.ex.imm_data = 0; | |
388 | wc.wc_flags = 0; | |
f931551b RC |
389 | send_last: |
390 | /* Get the number of bytes the message was padded by. */ | |
391 | pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; | |
392 | /* Check for invalid length. */ | |
393 | /* XXX LAST len should be >= 1 */ | |
394 | if (unlikely(tlen < (hdrsize + pad + 4))) | |
395 | goto rewind; | |
396 | /* Don't count the CRC. */ | |
397 | tlen -= (hdrsize + pad + 4); | |
398 | wc.byte_len = tlen + qp->r_rcv_len; | |
399 | if (unlikely(wc.byte_len > qp->r_len)) | |
400 | goto rewind; | |
401 | wc.opcode = IB_WC_RECV; | |
f931551b | 402 | qib_copy_sge(&qp->r_sge, data, tlen, 0); |
6a82649f | 403 | qib_put_ss(&qp->s_rdma_read_sge); |
354dff1b | 404 | last_imm: |
f931551b RC |
405 | wc.wr_id = qp->r_wr_id; |
406 | wc.status = IB_WC_SUCCESS; | |
407 | wc.qp = &qp->ibqp; | |
408 | wc.src_qp = qp->remote_qpn; | |
409 | wc.slid = qp->remote_ah_attr.dlid; | |
410 | wc.sl = qp->remote_ah_attr.sl; | |
2fc109c8 MM |
411 | /* zero fields that are N/A */ |
412 | wc.vendor_err = 0; | |
413 | wc.pkey_index = 0; | |
414 | wc.dlid_path_bits = 0; | |
415 | wc.port_num = 0; | |
f931551b RC |
416 | /* Signal completion event if the solicited bit is set. */ |
417 | qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, | |
418 | (ohdr->bth[0] & | |
419 | cpu_to_be32(IB_BTH_SOLICITED)) != 0); | |
420 | break; | |
421 | ||
422 | case OP(RDMA_WRITE_FIRST): | |
423 | case OP(RDMA_WRITE_ONLY): | |
424 | case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */ | |
425 | rdma_first: | |
426 | if (unlikely(!(qp->qp_access_flags & | |
427 | IB_ACCESS_REMOTE_WRITE))) { | |
428 | goto drop; | |
429 | } | |
430 | reth = &ohdr->u.rc.reth; | |
431 | hdrsize += sizeof(*reth); | |
432 | qp->r_len = be32_to_cpu(reth->length); | |
433 | qp->r_rcv_len = 0; | |
434 | qp->r_sge.sg_list = NULL; | |
435 | if (qp->r_len != 0) { | |
436 | u32 rkey = be32_to_cpu(reth->rkey); | |
437 | u64 vaddr = be64_to_cpu(reth->vaddr); | |
438 | int ok; | |
439 | ||
440 | /* Check rkey */ | |
441 | ok = qib_rkey_ok(qp, &qp->r_sge.sge, qp->r_len, | |
442 | vaddr, rkey, IB_ACCESS_REMOTE_WRITE); | |
443 | if (unlikely(!ok)) | |
444 | goto drop; | |
445 | qp->r_sge.num_sge = 1; | |
446 | } else { | |
447 | qp->r_sge.num_sge = 0; | |
448 | qp->r_sge.sge.mr = NULL; | |
449 | qp->r_sge.sge.vaddr = NULL; | |
450 | qp->r_sge.sge.length = 0; | |
451 | qp->r_sge.sge.sge_length = 0; | |
452 | } | |
453 | if (opcode == OP(RDMA_WRITE_ONLY)) | |
454 | goto rdma_last; | |
5715f5d4 JG |
455 | else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) { |
456 | wc.ex.imm_data = ohdr->u.rc.imm_data; | |
f931551b | 457 | goto rdma_last_imm; |
5715f5d4 | 458 | } |
f931551b RC |
459 | /* FALLTHROUGH */ |
460 | case OP(RDMA_WRITE_MIDDLE): | |
461 | /* Check for invalid length PMTU or posted rwqe len. */ | |
462 | if (unlikely(tlen != (hdrsize + pmtu + 4))) | |
463 | goto drop; | |
464 | qp->r_rcv_len += pmtu; | |
465 | if (unlikely(qp->r_rcv_len > qp->r_len)) | |
466 | goto drop; | |
467 | qib_copy_sge(&qp->r_sge, data, pmtu, 1); | |
468 | break; | |
469 | ||
470 | case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE): | |
f931551b | 471 | wc.ex.imm_data = ohdr->u.imm_data; |
5715f5d4 | 472 | rdma_last_imm: |
f931551b RC |
473 | hdrsize += 4; |
474 | wc.wc_flags = IB_WC_WITH_IMM; | |
475 | ||
476 | /* Get the number of bytes the message was padded by. */ | |
477 | pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; | |
478 | /* Check for invalid length. */ | |
479 | /* XXX LAST len should be >= 1 */ | |
480 | if (unlikely(tlen < (hdrsize + pad + 4))) | |
481 | goto drop; | |
482 | /* Don't count the CRC. */ | |
483 | tlen -= (hdrsize + pad + 4); | |
484 | if (unlikely(tlen + qp->r_rcv_len != qp->r_len)) | |
485 | goto drop; | |
486 | if (test_and_clear_bit(QIB_R_REWIND_SGE, &qp->r_aflags)) | |
6a82649f | 487 | qib_put_ss(&qp->s_rdma_read_sge); |
f931551b RC |
488 | else { |
489 | ret = qib_get_rwqe(qp, 1); | |
490 | if (ret < 0) | |
491 | goto op_err; | |
492 | if (!ret) | |
493 | goto drop; | |
494 | } | |
495 | wc.byte_len = qp->r_len; | |
496 | wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; | |
354dff1b | 497 | qib_copy_sge(&qp->r_sge, data, tlen, 1); |
6a82649f | 498 | qib_put_ss(&qp->r_sge); |
f931551b RC |
499 | goto last_imm; |
500 | ||
501 | case OP(RDMA_WRITE_LAST): | |
502 | rdma_last: | |
503 | /* Get the number of bytes the message was padded by. */ | |
504 | pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; | |
505 | /* Check for invalid length. */ | |
506 | /* XXX LAST len should be >= 1 */ | |
507 | if (unlikely(tlen < (hdrsize + pad + 4))) | |
508 | goto drop; | |
509 | /* Don't count the CRC. */ | |
510 | tlen -= (hdrsize + pad + 4); | |
511 | if (unlikely(tlen + qp->r_rcv_len != qp->r_len)) | |
512 | goto drop; | |
513 | qib_copy_sge(&qp->r_sge, data, tlen, 1); | |
6a82649f | 514 | qib_put_ss(&qp->r_sge); |
f931551b RC |
515 | break; |
516 | ||
517 | default: | |
518 | /* Drop packet for unknown opcodes. */ | |
519 | goto drop; | |
520 | } | |
521 | qp->r_psn++; | |
522 | qp->r_state = opcode; | |
f931551b RC |
523 | return; |
524 | ||
525 | rewind: | |
526 | set_bit(QIB_R_REWIND_SGE, &qp->r_aflags); | |
527 | qp->r_sge.num_sge = 0; | |
528 | drop: | |
529 | ibp->n_pkt_drops++; | |
f931551b RC |
530 | return; |
531 | ||
532 | op_err: | |
533 | qib_rc_error(qp, IB_WC_LOC_QP_OP_ERR); | |
f931551b RC |
534 | return; |
535 | ||
f931551b | 536 | } |