2 * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved.
3 * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
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:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
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.
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
34 #include <rdma/ib_smi.h>
35 #include <rdma/ib_verbs.h>
41 * qib_ud_loopback - handle send on loopback QPs
42 * @sqp: the sending QP
43 * @swqe: the send work request
45 * This is called from qib_make_ud_req() to forward a WQE addressed
47 * Note that the receive interrupt handler may be calling qib_ud_rcv()
48 * while this is being called.
50 static void qib_ud_loopback(struct rvt_qp *sqp, struct rvt_swqe *swqe)
52 struct qib_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num);
53 struct qib_pportdata *ppd = ppd_from_ibp(ibp);
54 struct qib_devdata *dd = ppd->dd;
55 struct rvt_dev_info *rdi = &dd->verbs_dev.rdi;
57 struct rdma_ah_attr *ah_attr;
59 struct rvt_sge_state ssge;
63 enum ib_qp_type sqptype, dqptype;
66 qp = rvt_lookup_qpn(rdi, &ibp->rvp, swqe->ud_wr.remote_qpn);
68 ibp->rvp.n_pkt_drops++;
72 sqptype = sqp->ibqp.qp_type == IB_QPT_GSI ?
73 IB_QPT_UD : sqp->ibqp.qp_type;
74 dqptype = qp->ibqp.qp_type == IB_QPT_GSI ?
75 IB_QPT_UD : qp->ibqp.qp_type;
77 if (dqptype != sqptype ||
78 !(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) {
79 ibp->rvp.n_pkt_drops++;
83 ah_attr = &ibah_to_rvtah(swqe->ud_wr.ah)->attr;
84 ppd = ppd_from_ibp(ibp);
86 if (qp->ibqp.qp_num > 1) {
91 pkey1 = qib_get_pkey(ibp, sqp->s_pkey_index);
92 pkey2 = qib_get_pkey(ibp, qp->s_pkey_index);
93 if (unlikely(!qib_pkey_ok(pkey1, pkey2))) {
94 lid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) &
95 ((1 << ppd->lmc) - 1));
96 qib_bad_pkey(ibp, pkey1,
97 rdma_ah_get_sl(ah_attr),
98 sqp->ibqp.qp_num, qp->ibqp.qp_num,
100 cpu_to_be16(rdma_ah_get_dlid(ah_attr)));
106 * Check that the qkey matches (except for QP0, see 9.6.1.4.1).
107 * Qkeys with the high order bit set mean use the
108 * qkey from the QP context instead of the WR (see 10.2.5).
110 if (qp->ibqp.qp_num) {
113 qkey = (int)swqe->ud_wr.remote_qkey < 0 ?
114 sqp->qkey : swqe->ud_wr.remote_qkey;
115 if (unlikely(qkey != qp->qkey))
120 * A GRH is expected to precede the data even if not
121 * present on the wire.
123 length = swqe->length;
124 memset(&wc, 0, sizeof(wc));
125 wc.byte_len = length + sizeof(struct ib_grh);
127 if (swqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
128 wc.wc_flags = IB_WC_WITH_IMM;
129 wc.ex.imm_data = swqe->wr.ex.imm_data;
132 spin_lock_irqsave(&qp->r_lock, flags);
135 * Get the next work request entry to find where to put the data.
137 if (qp->r_flags & RVT_R_REUSE_SGE)
138 qp->r_flags &= ~RVT_R_REUSE_SGE;
142 ret = qib_get_rwqe(qp, 0);
144 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
148 if (qp->ibqp.qp_num == 0)
149 ibp->rvp.n_vl15_dropped++;
153 /* Silently drop packets which are too big. */
154 if (unlikely(wc.byte_len > qp->r_len)) {
155 qp->r_flags |= RVT_R_REUSE_SGE;
156 ibp->rvp.n_pkt_drops++;
160 if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
162 const struct ib_global_route *grd = rdma_ah_read_grh(ah_attr);
164 qib_make_grh(ibp, &grh, grd, 0, 0);
165 qib_copy_sge(&qp->r_sge, &grh,
167 wc.wc_flags |= IB_WC_GRH;
169 rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true);
170 ssge.sg_list = swqe->sg_list + 1;
171 ssge.sge = *swqe->sg_list;
172 ssge.num_sge = swqe->wr.num_sge;
175 u32 len = sge->length;
179 if (len > sge->sge_length)
180 len = sge->sge_length;
182 qib_copy_sge(&qp->r_sge, sge->vaddr, len, 1);
185 sge->sge_length -= len;
186 if (sge->sge_length == 0) {
188 *sge = *ssge.sg_list++;
189 } else if (sge->length == 0 && sge->mr->lkey) {
190 if (++sge->n >= RVT_SEGSZ) {
191 if (++sge->m >= sge->mr->mapsz)
196 sge->mr->map[sge->m]->segs[sge->n].vaddr;
198 sge->mr->map[sge->m]->segs[sge->n].length;
202 rvt_put_ss(&qp->r_sge);
203 if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags))
205 wc.wr_id = qp->r_wr_id;
206 wc.status = IB_WC_SUCCESS;
207 wc.opcode = IB_WC_RECV;
209 wc.src_qp = sqp->ibqp.qp_num;
210 wc.pkey_index = qp->ibqp.qp_type == IB_QPT_GSI ?
211 swqe->ud_wr.pkey_index : 0;
212 wc.slid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) &
213 ((1 << ppd->lmc) - 1));
214 wc.sl = rdma_ah_get_sl(ah_attr);
215 wc.dlid_path_bits = rdma_ah_get_dlid(ah_attr) & ((1 << ppd->lmc) - 1);
216 wc.port_num = qp->port_num;
217 /* Signal completion event if the solicited bit is set. */
218 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc,
219 swqe->wr.send_flags & IB_SEND_SOLICITED);
220 ibp->rvp.n_loop_pkts++;
222 spin_unlock_irqrestore(&qp->r_lock, flags);
228 * qib_make_ud_req - construct a UD request packet
231 * Assumes the s_lock is held.
233 * Return 1 if constructed; otherwise, return 0.
235 int qib_make_ud_req(struct rvt_qp *qp, unsigned long *flags)
237 struct qib_qp_priv *priv = qp->priv;
238 struct ib_other_headers *ohdr;
239 struct rdma_ah_attr *ah_attr;
240 struct qib_pportdata *ppd;
241 struct qib_ibport *ibp;
242 struct rvt_swqe *wqe;
251 if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_NEXT_SEND_OK)) {
252 if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
254 /* We are in the error state, flush the work request. */
255 smp_read_barrier_depends(); /* see post_one_send */
256 if (qp->s_last == ACCESS_ONCE(qp->s_head))
258 /* If DMAs are in progress, we can't flush immediately. */
259 if (atomic_read(&priv->s_dma_busy)) {
260 qp->s_flags |= RVT_S_WAIT_DMA;
263 wqe = rvt_get_swqe_ptr(qp, qp->s_last);
264 qib_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
268 /* see post_one_send() */
269 smp_read_barrier_depends();
270 if (qp->s_cur == ACCESS_ONCE(qp->s_head))
273 wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
274 next_cur = qp->s_cur + 1;
275 if (next_cur >= qp->s_size)
278 /* Construct the header. */
279 ibp = to_iport(qp->ibqp.device, qp->port_num);
280 ppd = ppd_from_ibp(ibp);
281 ah_attr = &ibah_to_rvtah(wqe->ud_wr.ah)->attr;
282 if (rdma_ah_get_dlid(ah_attr) >= be16_to_cpu(IB_MULTICAST_LID_BASE)) {
283 if (rdma_ah_get_dlid(ah_attr) !=
284 be16_to_cpu(IB_LID_PERMISSIVE))
285 this_cpu_inc(ibp->pmastats->n_multicast_xmit);
287 this_cpu_inc(ibp->pmastats->n_unicast_xmit);
289 this_cpu_inc(ibp->pmastats->n_unicast_xmit);
290 lid = rdma_ah_get_dlid(ah_attr) & ~((1 << ppd->lmc) - 1);
291 if (unlikely(lid == ppd->lid)) {
292 unsigned long tflags = *flags;
294 * If DMAs are in progress, we can't generate
295 * a completion for the loopback packet since
296 * it would be out of order.
297 * XXX Instead of waiting, we could queue a
298 * zero length descriptor so we get a callback.
300 if (atomic_read(&priv->s_dma_busy)) {
301 qp->s_flags |= RVT_S_WAIT_DMA;
304 qp->s_cur = next_cur;
305 spin_unlock_irqrestore(&qp->s_lock, tflags);
306 qib_ud_loopback(qp, wqe);
307 spin_lock_irqsave(&qp->s_lock, tflags);
309 qib_send_complete(qp, wqe, IB_WC_SUCCESS);
314 qp->s_cur = next_cur;
315 extra_bytes = -wqe->length & 3;
316 nwords = (wqe->length + extra_bytes) >> 2;
318 /* header size in 32-bit words LRH+BTH+DETH = (8+12+8)/4. */
320 qp->s_cur_size = wqe->length;
321 qp->s_cur_sge = &qp->s_sge;
322 qp->s_srate = rdma_ah_get_static_rate(ah_attr);
324 qp->s_sge.sge = wqe->sg_list[0];
325 qp->s_sge.sg_list = wqe->sg_list + 1;
326 qp->s_sge.num_sge = wqe->wr.num_sge;
327 qp->s_sge.total_len = wqe->length;
329 if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
330 /* Header size in 32-bit words. */
331 qp->s_hdrwords += qib_make_grh(ibp, &priv->s_hdr->u.l.grh,
332 rdma_ah_read_grh(ah_attr),
333 qp->s_hdrwords, nwords);
335 ohdr = &priv->s_hdr->u.l.oth;
337 * Don't worry about sending to locally attached multicast
338 * QPs. It is unspecified by the spec. what happens.
341 /* Header size in 32-bit words. */
343 ohdr = &priv->s_hdr->u.oth;
345 if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
347 ohdr->u.ud.imm_data = wqe->wr.ex.imm_data;
348 bth0 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE << 24;
350 bth0 = IB_OPCODE_UD_SEND_ONLY << 24;
351 lrh0 |= rdma_ah_get_sl(ah_attr) << 4;
352 if (qp->ibqp.qp_type == IB_QPT_SMI)
353 lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */
355 lrh0 |= ibp->sl_to_vl[rdma_ah_get_sl(ah_attr)] << 12;
356 priv->s_hdr->lrh[0] = cpu_to_be16(lrh0);
357 priv->s_hdr->lrh[1] =
358 cpu_to_be16(rdma_ah_get_dlid(ah_attr)); /* DEST LID */
359 priv->s_hdr->lrh[2] =
360 cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC);
363 lid |= rdma_ah_get_path_bits(ah_attr) &
364 ((1 << ppd->lmc) - 1);
365 priv->s_hdr->lrh[3] = cpu_to_be16(lid);
367 priv->s_hdr->lrh[3] = IB_LID_PERMISSIVE;
368 if (wqe->wr.send_flags & IB_SEND_SOLICITED)
369 bth0 |= IB_BTH_SOLICITED;
370 bth0 |= extra_bytes << 20;
371 bth0 |= qp->ibqp.qp_type == IB_QPT_SMI ? QIB_DEFAULT_P_KEY :
372 qib_get_pkey(ibp, qp->ibqp.qp_type == IB_QPT_GSI ?
373 wqe->ud_wr.pkey_index : qp->s_pkey_index);
374 ohdr->bth[0] = cpu_to_be32(bth0);
376 * Use the multicast QP if the destination LID is a multicast LID.
378 ohdr->bth[1] = rdma_ah_get_dlid(ah_attr) >=
379 be16_to_cpu(IB_MULTICAST_LID_BASE) &&
380 rdma_ah_get_dlid(ah_attr) != be16_to_cpu(IB_LID_PERMISSIVE) ?
381 cpu_to_be32(QIB_MULTICAST_QPN) :
382 cpu_to_be32(wqe->ud_wr.remote_qpn);
383 ohdr->bth[2] = cpu_to_be32(wqe->psn & QIB_PSN_MASK);
385 * Qkeys with the high order bit set mean use the
386 * qkey from the QP context instead of the WR (see 10.2.5).
388 ohdr->u.ud.deth[0] = cpu_to_be32((int)wqe->ud_wr.remote_qkey < 0 ?
389 qp->qkey : wqe->ud_wr.remote_qkey);
390 ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num);
395 qp->s_flags &= ~RVT_S_BUSY;
399 static unsigned qib_lookup_pkey(struct qib_ibport *ibp, u16 pkey)
401 struct qib_pportdata *ppd = ppd_from_ibp(ibp);
402 struct qib_devdata *dd = ppd->dd;
403 unsigned ctxt = ppd->hw_pidx;
406 pkey &= 0x7fff; /* remove limited/full membership bit */
408 for (i = 0; i < ARRAY_SIZE(dd->rcd[ctxt]->pkeys); ++i)
409 if ((dd->rcd[ctxt]->pkeys[i] & 0x7fff) == pkey)
413 * Should not get here, this means hardware failed to validate pkeys.
414 * Punt and return index 0.
420 * qib_ud_rcv - receive an incoming UD packet
421 * @ibp: the port the packet came in on
422 * @hdr: the packet header
423 * @has_grh: true if the packet has a GRH
424 * @data: the packet data
425 * @tlen: the packet length
426 * @qp: the QP the packet came on
428 * This is called from qib_qp_rcv() to process an incoming UD packet
430 * Called at interrupt level.
432 void qib_ud_rcv(struct qib_ibport *ibp, struct ib_header *hdr,
433 int has_grh, void *data, u32 tlen, struct rvt_qp *qp)
435 struct ib_other_headers *ohdr;
447 hdrsize = 8 + 12 + 8; /* LRH + BTH + DETH */
449 ohdr = &hdr->u.l.oth;
450 hdrsize = 8 + 40 + 12 + 8; /* LRH + GRH + BTH + DETH */
452 qkey = be32_to_cpu(ohdr->u.ud.deth[0]);
453 src_qp = be32_to_cpu(ohdr->u.ud.deth[1]) & RVT_QPN_MASK;
456 * Get the number of bytes the message was padded by
457 * and drop incomplete packets.
459 pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3;
460 if (unlikely(tlen < (hdrsize + pad + 4)))
463 tlen -= hdrsize + pad + 4;
466 * Check that the permissive LID is only used on QP0
467 * and the QKEY matches (see 9.6.1.4.1 and 9.6.1.5.1).
469 if (qp->ibqp.qp_num) {
470 if (unlikely(hdr->lrh[1] == IB_LID_PERMISSIVE ||
471 hdr->lrh[3] == IB_LID_PERMISSIVE))
473 if (qp->ibqp.qp_num > 1) {
476 pkey1 = be32_to_cpu(ohdr->bth[0]);
477 pkey2 = qib_get_pkey(ibp, qp->s_pkey_index);
478 if (unlikely(!qib_pkey_ok(pkey1, pkey2))) {
481 (be16_to_cpu(hdr->lrh[0]) >> 4) &
483 src_qp, qp->ibqp.qp_num,
484 hdr->lrh[3], hdr->lrh[1]);
488 if (unlikely(qkey != qp->qkey))
491 /* Drop invalid MAD packets (see 13.5.3.1). */
492 if (unlikely(qp->ibqp.qp_num == 1 &&
494 (be16_to_cpu(hdr->lrh[0]) >> 12) == 15)))
499 /* Drop invalid MAD packets (see 13.5.3.1). */
500 if (tlen != 256 || (be16_to_cpu(hdr->lrh[0]) >> 12) != 15)
502 smp = (struct ib_smp *) data;
503 if ((hdr->lrh[1] == IB_LID_PERMISSIVE ||
504 hdr->lrh[3] == IB_LID_PERMISSIVE) &&
505 smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
510 * The opcode is in the low byte when its in network order
511 * (top byte when in host order).
513 opcode = be32_to_cpu(ohdr->bth[0]) >> 24;
514 if (qp->ibqp.qp_num > 1 &&
515 opcode == IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE) {
516 wc.ex.imm_data = ohdr->u.ud.imm_data;
517 wc.wc_flags = IB_WC_WITH_IMM;
518 } else if (opcode == IB_OPCODE_UD_SEND_ONLY) {
525 * A GRH is expected to precede the data even if not
526 * present on the wire.
528 wc.byte_len = tlen + sizeof(struct ib_grh);
531 * Get the next work request entry to find where to put the data.
533 if (qp->r_flags & RVT_R_REUSE_SGE)
534 qp->r_flags &= ~RVT_R_REUSE_SGE;
538 ret = qib_get_rwqe(qp, 0);
540 rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
544 if (qp->ibqp.qp_num == 0)
545 ibp->rvp.n_vl15_dropped++;
549 /* Silently drop packets which are too big. */
550 if (unlikely(wc.byte_len > qp->r_len)) {
551 qp->r_flags |= RVT_R_REUSE_SGE;
555 qib_copy_sge(&qp->r_sge, &hdr->u.l.grh,
556 sizeof(struct ib_grh), 1);
557 wc.wc_flags |= IB_WC_GRH;
559 rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true);
560 qib_copy_sge(&qp->r_sge, data, wc.byte_len - sizeof(struct ib_grh), 1);
561 rvt_put_ss(&qp->r_sge);
562 if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags))
564 wc.wr_id = qp->r_wr_id;
565 wc.status = IB_WC_SUCCESS;
566 wc.opcode = IB_WC_RECV;
570 wc.pkey_index = qp->ibqp.qp_type == IB_QPT_GSI ?
571 qib_lookup_pkey(ibp, be32_to_cpu(ohdr->bth[0])) : 0;
572 wc.slid = be16_to_cpu(hdr->lrh[3]);
573 wc.sl = (be16_to_cpu(hdr->lrh[0]) >> 4) & 0xF;
574 dlid = be16_to_cpu(hdr->lrh[1]);
576 * Save the LMC lower bits if the destination LID is a unicast LID.
578 wc.dlid_path_bits = dlid >= be16_to_cpu(IB_MULTICAST_LID_BASE) ? 0 :
579 dlid & ((1 << ppd_from_ibp(ibp)->lmc) - 1);
580 wc.port_num = qp->port_num;
581 /* Signal completion event if the solicited bit is set. */
582 rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc,
584 cpu_to_be32(IB_BTH_SOLICITED)) != 0);
588 ibp->rvp.n_pkt_drops++;