2 * Copyright (c) 2006, 2007, 2008, 2009, 2010 QLogic Corporation.
4 * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
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:
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
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.
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
37 /* cut down ridiculously long IB macro names */
38 #define OP(x) IB_OPCODE_UC_##x
41 * qib_make_uc_req - construct a request packet (SEND, RDMA write)
42 * @qp: a pointer to the QP
44 * Return 1 if constructed; otherwise, return 0.
46 int qib_make_uc_req(struct qib_qp *qp)
48 struct qib_other_headers *ohdr;
57 spin_lock_irqsave(&qp->s_lock, flags);
59 if (!(ib_qib_state_ops[qp->state] & QIB_PROCESS_SEND_OK)) {
60 if (!(ib_qib_state_ops[qp->state] & QIB_FLUSH_SEND))
62 /* We are in the error state, flush the work request. */
63 if (qp->s_last == qp->s_head)
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;
70 wqe = get_swqe_ptr(qp, qp->s_last);
71 qib_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
75 ohdr = &qp->s_hdr.u.oth;
76 if (qp->remote_ah_attr.ah_flags & IB_AH_GRH)
77 ohdr = &qp->s_hdr.u.l.oth;
79 /* header size in 32-bit words LRH+BTH = (8+12)/4. */
83 /* Get the next send request. */
84 wqe = get_swqe_ptr(qp, qp->s_cur);
86 switch (qp->s_state) {
88 if (!(ib_qib_state_ops[qp->state] &
89 QIB_PROCESS_NEXT_SEND_OK))
91 /* Check if send work queue is empty. */
92 if (qp->s_cur == qp->s_head)
95 * Start a new request.
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;
105 switch (wqe->wr.opcode) {
107 case IB_WR_SEND_WITH_IMM:
109 qp->s_state = OP(SEND_FIRST);
113 if (wqe->wr.opcode == IB_WR_SEND)
114 qp->s_state = OP(SEND_ONLY);
117 OP(SEND_ONLY_WITH_IMMEDIATE);
118 /* Immediate data comes after the BTH */
119 ohdr->u.imm_data = wqe->wr.ex.imm_data;
122 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
123 bth0 |= IB_BTH_SOLICITED;
125 if (++qp->s_cur >= qp->s_size)
129 case IB_WR_RDMA_WRITE:
130 case IB_WR_RDMA_WRITE_WITH_IMM:
131 ohdr->u.rc.reth.vaddr =
132 cpu_to_be64(wqe->wr.wr.rdma.remote_addr);
133 ohdr->u.rc.reth.rkey =
134 cpu_to_be32(wqe->wr.wr.rdma.rkey);
135 ohdr->u.rc.reth.length = cpu_to_be32(len);
136 hwords += sizeof(struct ib_reth) / 4;
138 qp->s_state = OP(RDMA_WRITE_FIRST);
142 if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
143 qp->s_state = OP(RDMA_WRITE_ONLY);
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;
150 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
151 bth0 |= IB_BTH_SOLICITED;
154 if (++qp->s_cur >= qp->s_size)
164 qp->s_state = OP(SEND_MIDDLE);
166 case OP(SEND_MIDDLE):
172 if (wqe->wr.opcode == IB_WR_SEND)
173 qp->s_state = OP(SEND_LAST);
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;
180 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
181 bth0 |= IB_BTH_SOLICITED;
183 if (++qp->s_cur >= qp->s_size)
187 case OP(RDMA_WRITE_FIRST):
188 qp->s_state = OP(RDMA_WRITE_MIDDLE);
190 case OP(RDMA_WRITE_MIDDLE):
196 if (wqe->wr.opcode == IB_WR_RDMA_WRITE)
197 qp->s_state = OP(RDMA_WRITE_LAST);
200 OP(RDMA_WRITE_LAST_WITH_IMMEDIATE);
201 /* Immediate data comes after the BTH */
202 ohdr->u.imm_data = wqe->wr.ex.imm_data;
204 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
205 bth0 |= IB_BTH_SOLICITED;
208 if (++qp->s_cur >= qp->s_size)
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);
223 qp->s_flags &= ~QIB_S_BUSY;
225 spin_unlock_irqrestore(&qp->s_lock, flags);
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.
238 * This is called from qib_qp_rcv() to process an incoming UC packet
240 * Called at interrupt level.
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)
245 struct qib_other_headers *ohdr;
253 struct ib_reth *reth;
259 hdrsize = 8 + 12; /* LRH + BTH */
261 ohdr = &hdr->u.l.oth;
262 hdrsize = 8 + 40 + 12; /* LRH + GRH + BTH */
265 opcode = be32_to_cpu(ohdr->bth[0]);
266 spin_lock_irqsave(&qp->s_lock, flags);
267 if (qib_ruc_check_hdr(ibp, hdr, has_grh, qp, opcode))
269 spin_unlock_irqrestore(&qp->s_lock, flags);
271 psn = be32_to_cpu(ohdr->bth[2]);
274 /* Compare the PSN verses the expected PSN. */
275 if (unlikely(qib_cmp24(psn, qp->r_psn) != 0)) {
277 * Handle a sequence error.
278 * Silently drop any current message.
282 if (qp->r_state == OP(SEND_FIRST) ||
283 qp->r_state == OP(SEND_MIDDLE)) {
284 set_bit(QIB_R_REWIND_SGE, &qp->r_aflags);
285 qp->r_sge.num_sge = 0;
287 while (qp->r_sge.num_sge) {
288 atomic_dec(&qp->r_sge.sge.mr->refcount);
289 if (--qp->r_sge.num_sge)
290 qp->r_sge.sge = *qp->r_sge.sg_list++;
292 qp->r_state = OP(SEND_LAST);
296 case OP(SEND_ONLY_WITH_IMMEDIATE):
299 case OP(RDMA_WRITE_FIRST):
300 case OP(RDMA_WRITE_ONLY):
301 case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE):
309 /* Check for opcode sequence errors. */
310 switch (qp->r_state) {
312 case OP(SEND_MIDDLE):
313 if (opcode == OP(SEND_MIDDLE) ||
314 opcode == OP(SEND_LAST) ||
315 opcode == OP(SEND_LAST_WITH_IMMEDIATE))
319 case OP(RDMA_WRITE_FIRST):
320 case OP(RDMA_WRITE_MIDDLE):
321 if (opcode == OP(RDMA_WRITE_MIDDLE) ||
322 opcode == OP(RDMA_WRITE_LAST) ||
323 opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE))
328 if (opcode == OP(SEND_FIRST) ||
329 opcode == OP(SEND_ONLY) ||
330 opcode == OP(SEND_ONLY_WITH_IMMEDIATE) ||
331 opcode == OP(RDMA_WRITE_FIRST) ||
332 opcode == OP(RDMA_WRITE_ONLY) ||
333 opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE))
338 if (qp->state == IB_QPS_RTR && !(qp->r_flags & QIB_R_COMM_EST)) {
339 qp->r_flags |= QIB_R_COMM_EST;
340 if (qp->ibqp.event_handler) {
343 ev.device = qp->ibqp.device;
344 ev.element.qp = &qp->ibqp;
345 ev.event = IB_EVENT_COMM_EST;
346 qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
350 /* OK, process the packet. */
354 case OP(SEND_ONLY_WITH_IMMEDIATE):
356 if (test_and_clear_bit(QIB_R_REWIND_SGE, &qp->r_aflags))
357 qp->r_sge = qp->s_rdma_read_sge;
359 ret = qib_get_rwqe(qp, 0);
365 * qp->s_rdma_read_sge will be the owner
366 * of the mr references.
368 qp->s_rdma_read_sge = qp->r_sge;
371 if (opcode == OP(SEND_ONLY))
372 goto no_immediate_data;
373 else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE))
376 case OP(SEND_MIDDLE):
377 /* Check for invalid length PMTU or posted rwqe len. */
378 if (unlikely(tlen != (hdrsize + pmtu + 4)))
380 qp->r_rcv_len += pmtu;
381 if (unlikely(qp->r_rcv_len > qp->r_len))
383 qib_copy_sge(&qp->r_sge, data, pmtu, 0);
386 case OP(SEND_LAST_WITH_IMMEDIATE):
388 wc.ex.imm_data = ohdr->u.imm_data;
390 wc.wc_flags = IB_WC_WITH_IMM;
397 /* Get the number of bytes the message was padded by. */
398 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
399 /* Check for invalid length. */
400 /* XXX LAST len should be >= 1 */
401 if (unlikely(tlen < (hdrsize + pad + 4)))
403 /* Don't count the CRC. */
404 tlen -= (hdrsize + pad + 4);
405 wc.byte_len = tlen + qp->r_rcv_len;
406 if (unlikely(wc.byte_len > qp->r_len))
408 wc.opcode = IB_WC_RECV;
410 qib_copy_sge(&qp->r_sge, data, tlen, 0);
411 while (qp->s_rdma_read_sge.num_sge) {
412 atomic_dec(&qp->s_rdma_read_sge.sge.mr->refcount);
413 if (--qp->s_rdma_read_sge.num_sge)
414 qp->s_rdma_read_sge.sge =
415 *qp->s_rdma_read_sge.sg_list++;
417 wc.wr_id = qp->r_wr_id;
418 wc.status = IB_WC_SUCCESS;
420 wc.src_qp = qp->remote_qpn;
421 wc.slid = qp->remote_ah_attr.dlid;
422 wc.sl = qp->remote_ah_attr.sl;
423 /* zero fields that are N/A */
426 wc.dlid_path_bits = 0;
429 /* Signal completion event if the solicited bit is set. */
430 qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
432 cpu_to_be32(IB_BTH_SOLICITED)) != 0);
435 case OP(RDMA_WRITE_FIRST):
436 case OP(RDMA_WRITE_ONLY):
437 case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): /* consume RWQE */
439 if (unlikely(!(qp->qp_access_flags &
440 IB_ACCESS_REMOTE_WRITE))) {
443 reth = &ohdr->u.rc.reth;
444 hdrsize += sizeof(*reth);
445 qp->r_len = be32_to_cpu(reth->length);
447 qp->r_sge.sg_list = NULL;
448 if (qp->r_len != 0) {
449 u32 rkey = be32_to_cpu(reth->rkey);
450 u64 vaddr = be64_to_cpu(reth->vaddr);
454 ok = qib_rkey_ok(qp, &qp->r_sge.sge, qp->r_len,
455 vaddr, rkey, IB_ACCESS_REMOTE_WRITE);
458 qp->r_sge.num_sge = 1;
460 qp->r_sge.num_sge = 0;
461 qp->r_sge.sge.mr = NULL;
462 qp->r_sge.sge.vaddr = NULL;
463 qp->r_sge.sge.length = 0;
464 qp->r_sge.sge.sge_length = 0;
466 if (opcode == OP(RDMA_WRITE_ONLY))
468 else if (opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) {
469 wc.ex.imm_data = ohdr->u.rc.imm_data;
473 case OP(RDMA_WRITE_MIDDLE):
474 /* Check for invalid length PMTU or posted rwqe len. */
475 if (unlikely(tlen != (hdrsize + pmtu + 4)))
477 qp->r_rcv_len += pmtu;
478 if (unlikely(qp->r_rcv_len > qp->r_len))
480 qib_copy_sge(&qp->r_sge, data, pmtu, 1);
483 case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE):
484 wc.ex.imm_data = ohdr->u.imm_data;
487 wc.wc_flags = IB_WC_WITH_IMM;
489 /* Get the number of bytes the message was padded by. */
490 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
491 /* Check for invalid length. */
492 /* XXX LAST len should be >= 1 */
493 if (unlikely(tlen < (hdrsize + pad + 4)))
495 /* Don't count the CRC. */
496 tlen -= (hdrsize + pad + 4);
497 if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
499 if (test_and_clear_bit(QIB_R_REWIND_SGE, &qp->r_aflags))
500 while (qp->s_rdma_read_sge.num_sge) {
501 atomic_dec(&qp->s_rdma_read_sge.sge.mr->
503 if (--qp->s_rdma_read_sge.num_sge)
504 qp->s_rdma_read_sge.sge =
505 *qp->s_rdma_read_sge.sg_list++;
508 ret = qib_get_rwqe(qp, 1);
514 wc.byte_len = qp->r_len;
515 wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
518 case OP(RDMA_WRITE_LAST):
520 /* Get the number of bytes the message was padded by. */
521 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
522 /* Check for invalid length. */
523 /* XXX LAST len should be >= 1 */
524 if (unlikely(tlen < (hdrsize + pad + 4)))
526 /* Don't count the CRC. */
527 tlen -= (hdrsize + pad + 4);
528 if (unlikely(tlen + qp->r_rcv_len != qp->r_len))
530 qib_copy_sge(&qp->r_sge, data, tlen, 1);
531 while (qp->r_sge.num_sge) {
532 atomic_dec(&qp->r_sge.sge.mr->refcount);
533 if (--qp->r_sge.num_sge)
534 qp->r_sge.sge = *qp->r_sge.sg_list++;
539 /* Drop packet for unknown opcodes. */
543 qp->r_state = opcode;
547 set_bit(QIB_R_REWIND_SGE, &qp->r_aflags);
548 qp->r_sge.num_sge = 0;
554 qib_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
558 spin_unlock_irqrestore(&qp->s_lock, flags);