xref: /openbmc/linux/drivers/infiniband/hw/hfi1/ud.c (revision f89d416a)
1 /*
2  * Copyright(c) 2015 - 2019 Intel Corporation.
3  *
4  * This file is provided under a dual BSD/GPLv2 license.  When using or
5  * redistributing this file, you may do so under either license.
6  *
7  * GPL LICENSE SUMMARY
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of version 2 of the GNU General Public License as
11  * published by the Free Software Foundation.
12  *
13  * This program is distributed in the hope that it will be useful, but
14  * WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * General Public License for more details.
17  *
18  * BSD LICENSE
19  *
20  * Redistribution and use in source and binary forms, with or without
21  * modification, are permitted provided that the following conditions
22  * are met:
23  *
24  *  - Redistributions of source code must retain the above copyright
25  *    notice, this list of conditions and the following disclaimer.
26  *  - Redistributions in binary form must reproduce the above copyright
27  *    notice, this list of conditions and the following disclaimer in
28  *    the documentation and/or other materials provided with the
29  *    distribution.
30  *  - Neither the name of Intel Corporation nor the names of its
31  *    contributors may be used to endorse or promote products derived
32  *    from this software without specific prior written permission.
33  *
34  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
35  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
36  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
37  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
38  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
39  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
40  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
41  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
42  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
43  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
44  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
45  *
46  */
47 
48 #include <linux/net.h>
49 #include <rdma/ib_smi.h>
50 
51 #include "hfi.h"
52 #include "mad.h"
53 #include "verbs_txreq.h"
54 #include "trace_ibhdrs.h"
55 #include "qp.h"
56 
57 /* We support only two types - 9B and 16B for now */
58 static const hfi1_make_req hfi1_make_ud_req_tbl[2] = {
59 	[HFI1_PKT_TYPE_9B] = &hfi1_make_ud_req_9B,
60 	[HFI1_PKT_TYPE_16B] = &hfi1_make_ud_req_16B
61 };
62 
63 /**
64  * ud_loopback - handle send on loopback QPs
65  * @sqp: the sending QP
66  * @swqe: the send work request
67  *
68  * This is called from hfi1_make_ud_req() to forward a WQE addressed
69  * to the same HFI.
70  * Note that the receive interrupt handler may be calling hfi1_ud_rcv()
71  * while this is being called.
72  */
73 static void ud_loopback(struct rvt_qp *sqp, struct rvt_swqe *swqe)
74 {
75 	struct hfi1_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num);
76 	struct hfi1_pportdata *ppd;
77 	struct hfi1_qp_priv *priv = sqp->priv;
78 	struct rvt_qp *qp;
79 	struct rdma_ah_attr *ah_attr;
80 	unsigned long flags;
81 	struct rvt_sge_state ssge;
82 	struct rvt_sge *sge;
83 	struct ib_wc wc;
84 	u32 length;
85 	enum ib_qp_type sqptype, dqptype;
86 
87 	rcu_read_lock();
88 
89 	qp = rvt_lookup_qpn(ib_to_rvt(sqp->ibqp.device), &ibp->rvp,
90 			    rvt_get_swqe_remote_qpn(swqe));
91 	if (!qp) {
92 		ibp->rvp.n_pkt_drops++;
93 		rcu_read_unlock();
94 		return;
95 	}
96 
97 	sqptype = sqp->ibqp.qp_type == IB_QPT_GSI ?
98 			IB_QPT_UD : sqp->ibqp.qp_type;
99 	dqptype = qp->ibqp.qp_type == IB_QPT_GSI ?
100 			IB_QPT_UD : qp->ibqp.qp_type;
101 
102 	if (dqptype != sqptype ||
103 	    !(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) {
104 		ibp->rvp.n_pkt_drops++;
105 		goto drop;
106 	}
107 
108 	ah_attr = rvt_get_swqe_ah_attr(swqe);
109 	ppd = ppd_from_ibp(ibp);
110 
111 	if (qp->ibqp.qp_num > 1) {
112 		u16 pkey;
113 		u32 slid;
114 		u8 sc5 = ibp->sl_to_sc[rdma_ah_get_sl(ah_attr)];
115 
116 		pkey = hfi1_get_pkey(ibp, sqp->s_pkey_index);
117 		slid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) &
118 				   ((1 << ppd->lmc) - 1));
119 		if (unlikely(ingress_pkey_check(ppd, pkey, sc5,
120 						qp->s_pkey_index,
121 						slid, false))) {
122 			hfi1_bad_pkey(ibp, pkey,
123 				      rdma_ah_get_sl(ah_attr),
124 				      sqp->ibqp.qp_num, qp->ibqp.qp_num,
125 				      slid, rdma_ah_get_dlid(ah_attr));
126 			goto drop;
127 		}
128 	}
129 
130 	/*
131 	 * Check that the qkey matches (except for QP0, see 9.6.1.4.1).
132 	 * Qkeys with the high order bit set mean use the
133 	 * qkey from the QP context instead of the WR (see 10.2.5).
134 	 */
135 	if (qp->ibqp.qp_num) {
136 		u32 qkey;
137 
138 		qkey = (int)rvt_get_swqe_remote_qkey(swqe) < 0 ?
139 			sqp->qkey : rvt_get_swqe_remote_qkey(swqe);
140 		if (unlikely(qkey != qp->qkey))
141 			goto drop; /* silently drop per IBTA spec */
142 	}
143 
144 	/*
145 	 * A GRH is expected to precede the data even if not
146 	 * present on the wire.
147 	 */
148 	length = swqe->length;
149 	memset(&wc, 0, sizeof(wc));
150 	wc.byte_len = length + sizeof(struct ib_grh);
151 
152 	if (swqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
153 		wc.wc_flags = IB_WC_WITH_IMM;
154 		wc.ex.imm_data = swqe->wr.ex.imm_data;
155 	}
156 
157 	spin_lock_irqsave(&qp->r_lock, flags);
158 
159 	/*
160 	 * Get the next work request entry to find where to put the data.
161 	 */
162 	if (qp->r_flags & RVT_R_REUSE_SGE) {
163 		qp->r_flags &= ~RVT_R_REUSE_SGE;
164 	} else {
165 		int ret;
166 
167 		ret = rvt_get_rwqe(qp, false);
168 		if (ret < 0) {
169 			rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
170 			goto bail_unlock;
171 		}
172 		if (!ret) {
173 			if (qp->ibqp.qp_num == 0)
174 				ibp->rvp.n_vl15_dropped++;
175 			goto bail_unlock;
176 		}
177 	}
178 	/* Silently drop packets which are too big. */
179 	if (unlikely(wc.byte_len > qp->r_len)) {
180 		qp->r_flags |= RVT_R_REUSE_SGE;
181 		ibp->rvp.n_pkt_drops++;
182 		goto bail_unlock;
183 	}
184 
185 	if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
186 		struct ib_grh grh;
187 		struct ib_global_route grd = *(rdma_ah_read_grh(ah_attr));
188 
189 		/*
190 		 * For loopback packets with extended LIDs, the
191 		 * sgid_index in the GRH is 0 and the dgid is
192 		 * OPA GID of the sender. While creating a response
193 		 * to the loopback packet, IB core creates the new
194 		 * sgid_index from the DGID and that will be the
195 		 * OPA_GID_INDEX. The new dgid is from the sgid
196 		 * index and that will be in the IB GID format.
197 		 *
198 		 * We now have a case where the sent packet had a
199 		 * different sgid_index and dgid compared to the
200 		 * one that was received in response.
201 		 *
202 		 * Fix this inconsistency.
203 		 */
204 		if (priv->hdr_type == HFI1_PKT_TYPE_16B) {
205 			if (grd.sgid_index == 0)
206 				grd.sgid_index = OPA_GID_INDEX;
207 
208 			if (ib_is_opa_gid(&grd.dgid))
209 				grd.dgid.global.interface_id =
210 				cpu_to_be64(ppd->guids[HFI1_PORT_GUID_INDEX]);
211 		}
212 
213 		hfi1_make_grh(ibp, &grh, &grd, 0, 0);
214 		rvt_copy_sge(qp, &qp->r_sge, &grh,
215 			     sizeof(grh), true, false);
216 		wc.wc_flags |= IB_WC_GRH;
217 	} else {
218 		rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true);
219 	}
220 	ssge.sg_list = swqe->sg_list + 1;
221 	ssge.sge = *swqe->sg_list;
222 	ssge.num_sge = swqe->wr.num_sge;
223 	sge = &ssge.sge;
224 	while (length) {
225 		u32 len = rvt_get_sge_length(sge, length);
226 
227 		WARN_ON_ONCE(len == 0);
228 		rvt_copy_sge(qp, &qp->r_sge, sge->vaddr, len, true, false);
229 		rvt_update_sge(&ssge, len, false);
230 		length -= len;
231 	}
232 	rvt_put_ss(&qp->r_sge);
233 	if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags))
234 		goto bail_unlock;
235 	wc.wr_id = qp->r_wr_id;
236 	wc.status = IB_WC_SUCCESS;
237 	wc.opcode = IB_WC_RECV;
238 	wc.qp = &qp->ibqp;
239 	wc.src_qp = sqp->ibqp.qp_num;
240 	if (qp->ibqp.qp_type == IB_QPT_GSI || qp->ibqp.qp_type == IB_QPT_SMI) {
241 		if (sqp->ibqp.qp_type == IB_QPT_GSI ||
242 		    sqp->ibqp.qp_type == IB_QPT_SMI)
243 			wc.pkey_index = rvt_get_swqe_pkey_index(swqe);
244 		else
245 			wc.pkey_index = sqp->s_pkey_index;
246 	} else {
247 		wc.pkey_index = 0;
248 	}
249 	wc.slid = (ppd->lid | (rdma_ah_get_path_bits(ah_attr) &
250 				   ((1 << ppd->lmc) - 1))) & U16_MAX;
251 	/* Check for loopback when the port lid is not set */
252 	if (wc.slid == 0 && sqp->ibqp.qp_type == IB_QPT_GSI)
253 		wc.slid = be16_to_cpu(IB_LID_PERMISSIVE);
254 	wc.sl = rdma_ah_get_sl(ah_attr);
255 	wc.dlid_path_bits = rdma_ah_get_dlid(ah_attr) & ((1 << ppd->lmc) - 1);
256 	wc.port_num = qp->port_num;
257 	/* Signal completion event if the solicited bit is set. */
258 	rvt_recv_cq(qp, &wc, swqe->wr.send_flags & IB_SEND_SOLICITED);
259 	ibp->rvp.n_loop_pkts++;
260 bail_unlock:
261 	spin_unlock_irqrestore(&qp->r_lock, flags);
262 drop:
263 	rcu_read_unlock();
264 }
265 
266 static void hfi1_make_bth_deth(struct rvt_qp *qp, struct rvt_swqe *wqe,
267 			       struct ib_other_headers *ohdr,
268 			       u16 *pkey, u32 extra_bytes, bool bypass)
269 {
270 	u32 bth0;
271 	struct hfi1_ibport *ibp;
272 
273 	ibp = to_iport(qp->ibqp.device, qp->port_num);
274 	if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
275 		ohdr->u.ud.imm_data = wqe->wr.ex.imm_data;
276 		bth0 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE << 24;
277 	} else {
278 		bth0 = IB_OPCODE_UD_SEND_ONLY << 24;
279 	}
280 
281 	if (wqe->wr.send_flags & IB_SEND_SOLICITED)
282 		bth0 |= IB_BTH_SOLICITED;
283 	bth0 |= extra_bytes << 20;
284 	if (qp->ibqp.qp_type == IB_QPT_GSI || qp->ibqp.qp_type == IB_QPT_SMI)
285 		*pkey = hfi1_get_pkey(ibp, rvt_get_swqe_pkey_index(wqe));
286 	else
287 		*pkey = hfi1_get_pkey(ibp, qp->s_pkey_index);
288 	if (!bypass)
289 		bth0 |= *pkey;
290 	ohdr->bth[0] = cpu_to_be32(bth0);
291 	ohdr->bth[1] = cpu_to_be32(rvt_get_swqe_remote_qpn(wqe));
292 	ohdr->bth[2] = cpu_to_be32(mask_psn(wqe->psn));
293 	/*
294 	 * Qkeys with the high order bit set mean use the
295 	 * qkey from the QP context instead of the WR (see 10.2.5).
296 	 */
297 	ohdr->u.ud.deth[0] =
298 		cpu_to_be32((int)rvt_get_swqe_remote_qkey(wqe) < 0 ? qp->qkey :
299 			    rvt_get_swqe_remote_qkey(wqe));
300 	ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num);
301 }
302 
303 void hfi1_make_ud_req_9B(struct rvt_qp *qp, struct hfi1_pkt_state *ps,
304 			 struct rvt_swqe *wqe)
305 {
306 	u32 nwords, extra_bytes;
307 	u16 len, slid, dlid, pkey;
308 	u16 lrh0 = 0;
309 	u8 sc5;
310 	struct hfi1_qp_priv *priv = qp->priv;
311 	struct ib_other_headers *ohdr;
312 	struct rdma_ah_attr *ah_attr;
313 	struct hfi1_pportdata *ppd;
314 	struct hfi1_ibport *ibp;
315 	struct ib_grh *grh;
316 
317 	ibp = to_iport(qp->ibqp.device, qp->port_num);
318 	ppd = ppd_from_ibp(ibp);
319 	ah_attr = rvt_get_swqe_ah_attr(wqe);
320 
321 	extra_bytes = -wqe->length & 3;
322 	nwords = ((wqe->length + extra_bytes) >> 2) + SIZE_OF_CRC;
323 	/* header size in dwords LRH+BTH+DETH = (8+12+8)/4. */
324 	ps->s_txreq->hdr_dwords = 7;
325 	if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM)
326 		ps->s_txreq->hdr_dwords++;
327 
328 	if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
329 		grh = &ps->s_txreq->phdr.hdr.ibh.u.l.grh;
330 		ps->s_txreq->hdr_dwords +=
331 			hfi1_make_grh(ibp, grh, rdma_ah_read_grh(ah_attr),
332 				      ps->s_txreq->hdr_dwords - LRH_9B_DWORDS,
333 				      nwords);
334 		lrh0 = HFI1_LRH_GRH;
335 		ohdr = &ps->s_txreq->phdr.hdr.ibh.u.l.oth;
336 	} else {
337 		lrh0 = HFI1_LRH_BTH;
338 		ohdr = &ps->s_txreq->phdr.hdr.ibh.u.oth;
339 	}
340 
341 	sc5 = ibp->sl_to_sc[rdma_ah_get_sl(ah_attr)];
342 	lrh0 |= (rdma_ah_get_sl(ah_attr) & 0xf) << 4;
343 	if (qp->ibqp.qp_type == IB_QPT_SMI) {
344 		lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */
345 		priv->s_sc = 0xf;
346 	} else {
347 		lrh0 |= (sc5 & 0xf) << 12;
348 		priv->s_sc = sc5;
349 	}
350 
351 	dlid = opa_get_lid(rdma_ah_get_dlid(ah_attr), 9B);
352 	if (dlid == be16_to_cpu(IB_LID_PERMISSIVE)) {
353 		slid = be16_to_cpu(IB_LID_PERMISSIVE);
354 	} else {
355 		u16 lid = (u16)ppd->lid;
356 
357 		if (lid) {
358 			lid |= rdma_ah_get_path_bits(ah_attr) &
359 				((1 << ppd->lmc) - 1);
360 			slid = lid;
361 		} else {
362 			slid = be16_to_cpu(IB_LID_PERMISSIVE);
363 		}
364 	}
365 	hfi1_make_bth_deth(qp, wqe, ohdr, &pkey, extra_bytes, false);
366 	len = ps->s_txreq->hdr_dwords + nwords;
367 
368 	/* Setup the packet */
369 	ps->s_txreq->phdr.hdr.hdr_type = HFI1_PKT_TYPE_9B;
370 	hfi1_make_ib_hdr(&ps->s_txreq->phdr.hdr.ibh,
371 			 lrh0, len, dlid, slid);
372 }
373 
374 void hfi1_make_ud_req_16B(struct rvt_qp *qp, struct hfi1_pkt_state *ps,
375 			  struct rvt_swqe *wqe)
376 {
377 	struct hfi1_qp_priv *priv = qp->priv;
378 	struct ib_other_headers *ohdr;
379 	struct rdma_ah_attr *ah_attr;
380 	struct hfi1_pportdata *ppd;
381 	struct hfi1_ibport *ibp;
382 	u32 dlid, slid, nwords, extra_bytes;
383 	u32 dest_qp = rvt_get_swqe_remote_qpn(wqe);
384 	u32 src_qp = qp->ibqp.qp_num;
385 	u16 len, pkey;
386 	u8 l4, sc5;
387 	bool is_mgmt = false;
388 
389 	ibp = to_iport(qp->ibqp.device, qp->port_num);
390 	ppd = ppd_from_ibp(ibp);
391 	ah_attr = rvt_get_swqe_ah_attr(wqe);
392 
393 	/*
394 	 * Build 16B Management Packet if either the destination
395 	 * or source queue pair number is 0 or 1.
396 	 */
397 	if (dest_qp == 0 || src_qp == 0 || dest_qp == 1 || src_qp == 1) {
398 		/* header size in dwords 16B LRH+L4_FM = (16+8)/4. */
399 		ps->s_txreq->hdr_dwords = 6;
400 		is_mgmt = true;
401 	} else {
402 		/* header size in dwords 16B LRH+BTH+DETH = (16+12+8)/4. */
403 		ps->s_txreq->hdr_dwords = 9;
404 		if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM)
405 			ps->s_txreq->hdr_dwords++;
406 	}
407 
408 	/* SW provides space for CRC and LT for bypass packets. */
409 	extra_bytes = hfi1_get_16b_padding((ps->s_txreq->hdr_dwords << 2),
410 					   wqe->length);
411 	nwords = ((wqe->length + extra_bytes + SIZE_OF_LT) >> 2) + SIZE_OF_CRC;
412 
413 	if ((rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) &&
414 	    hfi1_check_mcast(rdma_ah_get_dlid(ah_attr))) {
415 		struct ib_grh *grh;
416 		struct ib_global_route *grd = rdma_ah_retrieve_grh(ah_attr);
417 		/*
418 		 * Ensure OPA GIDs are transformed to IB gids
419 		 * before creating the GRH.
420 		 */
421 		if (grd->sgid_index == OPA_GID_INDEX) {
422 			dd_dev_warn(ppd->dd, "Bad sgid_index. sgid_index: %d\n",
423 				    grd->sgid_index);
424 			grd->sgid_index = 0;
425 		}
426 		grh = &ps->s_txreq->phdr.hdr.opah.u.l.grh;
427 		ps->s_txreq->hdr_dwords += hfi1_make_grh(
428 			ibp, grh, grd,
429 			ps->s_txreq->hdr_dwords - LRH_16B_DWORDS,
430 			nwords);
431 		ohdr = &ps->s_txreq->phdr.hdr.opah.u.l.oth;
432 		l4 = OPA_16B_L4_IB_GLOBAL;
433 	} else {
434 		ohdr = &ps->s_txreq->phdr.hdr.opah.u.oth;
435 		l4 = OPA_16B_L4_IB_LOCAL;
436 	}
437 
438 	sc5 = ibp->sl_to_sc[rdma_ah_get_sl(ah_attr)];
439 	if (qp->ibqp.qp_type == IB_QPT_SMI)
440 		priv->s_sc = 0xf;
441 	else
442 		priv->s_sc = sc5;
443 
444 	dlid = opa_get_lid(rdma_ah_get_dlid(ah_attr), 16B);
445 	if (!ppd->lid)
446 		slid = be32_to_cpu(OPA_LID_PERMISSIVE);
447 	else
448 		slid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) &
449 			   ((1 << ppd->lmc) - 1));
450 
451 	if (is_mgmt) {
452 		l4 = OPA_16B_L4_FM;
453 		pkey = hfi1_get_pkey(ibp, rvt_get_swqe_pkey_index(wqe));
454 		hfi1_16B_set_qpn(&ps->s_txreq->phdr.hdr.opah.u.mgmt,
455 				 dest_qp, src_qp);
456 	} else {
457 		hfi1_make_bth_deth(qp, wqe, ohdr, &pkey, extra_bytes, true);
458 	}
459 	/* Convert dwords to flits */
460 	len = (ps->s_txreq->hdr_dwords + nwords) >> 1;
461 
462 	/* Setup the packet */
463 	ps->s_txreq->phdr.hdr.hdr_type = HFI1_PKT_TYPE_16B;
464 	hfi1_make_16b_hdr(&ps->s_txreq->phdr.hdr.opah,
465 			  slid, dlid, len, pkey, 0, 0, l4, priv->s_sc);
466 }
467 
468 /**
469  * hfi1_make_ud_req - construct a UD request packet
470  * @qp: the QP
471  *
472  * Assume s_lock is held.
473  *
474  * Return 1 if constructed; otherwise, return 0.
475  */
476 int hfi1_make_ud_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
477 {
478 	struct hfi1_qp_priv *priv = qp->priv;
479 	struct rdma_ah_attr *ah_attr;
480 	struct hfi1_pportdata *ppd;
481 	struct hfi1_ibport *ibp;
482 	struct rvt_swqe *wqe;
483 	int next_cur;
484 	u32 lid;
485 
486 	ps->s_txreq = get_txreq(ps->dev, qp);
487 	if (!ps->s_txreq)
488 		goto bail_no_tx;
489 
490 	if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_NEXT_SEND_OK)) {
491 		if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
492 			goto bail;
493 		/* We are in the error state, flush the work request. */
494 		if (qp->s_last == READ_ONCE(qp->s_head))
495 			goto bail;
496 		/* If DMAs are in progress, we can't flush immediately. */
497 		if (iowait_sdma_pending(&priv->s_iowait)) {
498 			qp->s_flags |= RVT_S_WAIT_DMA;
499 			goto bail;
500 		}
501 		wqe = rvt_get_swqe_ptr(qp, qp->s_last);
502 		rvt_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
503 		goto done_free_tx;
504 	}
505 
506 	/* see post_one_send() */
507 	if (qp->s_cur == READ_ONCE(qp->s_head))
508 		goto bail;
509 
510 	wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
511 	next_cur = qp->s_cur + 1;
512 	if (next_cur >= qp->s_size)
513 		next_cur = 0;
514 
515 	/* Construct the header. */
516 	ibp = to_iport(qp->ibqp.device, qp->port_num);
517 	ppd = ppd_from_ibp(ibp);
518 	ah_attr = rvt_get_swqe_ah_attr(wqe);
519 	priv->hdr_type = hfi1_get_hdr_type(ppd->lid, ah_attr);
520 	if ((!hfi1_check_mcast(rdma_ah_get_dlid(ah_attr))) ||
521 	    (rdma_ah_get_dlid(ah_attr) == be32_to_cpu(OPA_LID_PERMISSIVE))) {
522 		lid = rdma_ah_get_dlid(ah_attr) & ~((1 << ppd->lmc) - 1);
523 		if (unlikely(!loopback &&
524 			     ((lid == ppd->lid) ||
525 			      ((lid == be32_to_cpu(OPA_LID_PERMISSIVE)) &&
526 			       (qp->ibqp.qp_type == IB_QPT_GSI))))) {
527 			unsigned long tflags = ps->flags;
528 			/*
529 			 * If DMAs are in progress, we can't generate
530 			 * a completion for the loopback packet since
531 			 * it would be out of order.
532 			 * Instead of waiting, we could queue a
533 			 * zero length descriptor so we get a callback.
534 			 */
535 			if (iowait_sdma_pending(&priv->s_iowait)) {
536 				qp->s_flags |= RVT_S_WAIT_DMA;
537 				goto bail;
538 			}
539 			qp->s_cur = next_cur;
540 			spin_unlock_irqrestore(&qp->s_lock, tflags);
541 			ud_loopback(qp, wqe);
542 			spin_lock_irqsave(&qp->s_lock, tflags);
543 			ps->flags = tflags;
544 			rvt_send_complete(qp, wqe, IB_WC_SUCCESS);
545 			goto done_free_tx;
546 		}
547 	}
548 
549 	qp->s_cur = next_cur;
550 	ps->s_txreq->s_cur_size = wqe->length;
551 	ps->s_txreq->ss = &qp->s_sge;
552 	qp->s_srate = rdma_ah_get_static_rate(ah_attr);
553 	qp->srate_mbps = ib_rate_to_mbps(qp->s_srate);
554 	qp->s_wqe = wqe;
555 	qp->s_sge.sge = wqe->sg_list[0];
556 	qp->s_sge.sg_list = wqe->sg_list + 1;
557 	qp->s_sge.num_sge = wqe->wr.num_sge;
558 	qp->s_sge.total_len = wqe->length;
559 
560 	/* Make the appropriate header */
561 	hfi1_make_ud_req_tbl[priv->hdr_type](qp, ps, qp->s_wqe);
562 	priv->s_sde = qp_to_sdma_engine(qp, priv->s_sc);
563 	ps->s_txreq->sde = priv->s_sde;
564 	priv->s_sendcontext = qp_to_send_context(qp, priv->s_sc);
565 	ps->s_txreq->psc = priv->s_sendcontext;
566 	/* disarm any ahg */
567 	priv->s_ahg->ahgcount = 0;
568 	priv->s_ahg->ahgidx = 0;
569 	priv->s_ahg->tx_flags = 0;
570 
571 	return 1;
572 
573 done_free_tx:
574 	hfi1_put_txreq(ps->s_txreq);
575 	ps->s_txreq = NULL;
576 	return 1;
577 
578 bail:
579 	hfi1_put_txreq(ps->s_txreq);
580 
581 bail_no_tx:
582 	ps->s_txreq = NULL;
583 	qp->s_flags &= ~RVT_S_BUSY;
584 	return 0;
585 }
586 
587 /*
588  * Hardware can't check this so we do it here.
589  *
590  * This is a slightly different algorithm than the standard pkey check.  It
591  * special cases the management keys and allows for 0x7fff and 0xffff to be in
592  * the table at the same time.
593  *
594  * @returns the index found or -1 if not found
595  */
596 int hfi1_lookup_pkey_idx(struct hfi1_ibport *ibp, u16 pkey)
597 {
598 	struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
599 	unsigned i;
600 
601 	if (pkey == FULL_MGMT_P_KEY || pkey == LIM_MGMT_P_KEY) {
602 		unsigned lim_idx = -1;
603 
604 		for (i = 0; i < ARRAY_SIZE(ppd->pkeys); ++i) {
605 			/* here we look for an exact match */
606 			if (ppd->pkeys[i] == pkey)
607 				return i;
608 			if (ppd->pkeys[i] == LIM_MGMT_P_KEY)
609 				lim_idx = i;
610 		}
611 
612 		/* did not find 0xffff return 0x7fff idx if found */
613 		if (pkey == FULL_MGMT_P_KEY)
614 			return lim_idx;
615 
616 		/* no match...  */
617 		return -1;
618 	}
619 
620 	pkey &= 0x7fff; /* remove limited/full membership bit */
621 
622 	for (i = 0; i < ARRAY_SIZE(ppd->pkeys); ++i)
623 		if ((ppd->pkeys[i] & 0x7fff) == pkey)
624 			return i;
625 
626 	/*
627 	 * Should not get here, this means hardware failed to validate pkeys.
628 	 */
629 	return -1;
630 }
631 
632 void return_cnp_16B(struct hfi1_ibport *ibp, struct rvt_qp *qp,
633 		    u32 remote_qpn, u16 pkey, u32 slid, u32 dlid,
634 		    u8 sc5, const struct ib_grh *old_grh)
635 {
636 	u64 pbc, pbc_flags = 0;
637 	u32 bth0, plen, vl, hwords = 7;
638 	u16 len;
639 	u8 l4;
640 	struct hfi1_opa_header hdr;
641 	struct ib_other_headers *ohdr;
642 	struct pio_buf *pbuf;
643 	struct send_context *ctxt = qp_to_send_context(qp, sc5);
644 	struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
645 	u32 nwords;
646 
647 	hdr.hdr_type = HFI1_PKT_TYPE_16B;
648 	/* Populate length */
649 	nwords = ((hfi1_get_16b_padding(hwords << 2, 0) +
650 		   SIZE_OF_LT) >> 2) + SIZE_OF_CRC;
651 	if (old_grh) {
652 		struct ib_grh *grh = &hdr.opah.u.l.grh;
653 
654 		grh->version_tclass_flow = old_grh->version_tclass_flow;
655 		grh->paylen = cpu_to_be16(
656 			(hwords - LRH_16B_DWORDS + nwords) << 2);
657 		grh->hop_limit = 0xff;
658 		grh->sgid = old_grh->dgid;
659 		grh->dgid = old_grh->sgid;
660 		ohdr = &hdr.opah.u.l.oth;
661 		l4 = OPA_16B_L4_IB_GLOBAL;
662 		hwords += sizeof(struct ib_grh) / sizeof(u32);
663 	} else {
664 		ohdr = &hdr.opah.u.oth;
665 		l4 = OPA_16B_L4_IB_LOCAL;
666 	}
667 
668 	/* BIT 16 to 19 is TVER. Bit 20 to 22 is pad cnt */
669 	bth0 = (IB_OPCODE_CNP << 24) | (1 << 16) |
670 	       (hfi1_get_16b_padding(hwords << 2, 0) << 20);
671 	ohdr->bth[0] = cpu_to_be32(bth0);
672 
673 	ohdr->bth[1] = cpu_to_be32(remote_qpn);
674 	ohdr->bth[2] = 0; /* PSN 0 */
675 
676 	/* Convert dwords to flits */
677 	len = (hwords + nwords) >> 1;
678 	hfi1_make_16b_hdr(&hdr.opah, slid, dlid, len, pkey, 1, 0, l4, sc5);
679 
680 	plen = 2 /* PBC */ + hwords + nwords;
681 	pbc_flags |= PBC_PACKET_BYPASS | PBC_INSERT_BYPASS_ICRC;
682 	vl = sc_to_vlt(ppd->dd, sc5);
683 	pbc = create_pbc(ppd, pbc_flags, qp->srate_mbps, vl, plen);
684 	if (ctxt) {
685 		pbuf = sc_buffer_alloc(ctxt, plen, NULL, NULL);
686 		if (!IS_ERR_OR_NULL(pbuf)) {
687 			trace_pio_output_ibhdr(ppd->dd, &hdr, sc5);
688 			ppd->dd->pio_inline_send(ppd->dd, pbuf, pbc,
689 						 &hdr, hwords);
690 		}
691 	}
692 }
693 
694 void return_cnp(struct hfi1_ibport *ibp, struct rvt_qp *qp, u32 remote_qpn,
695 		u16 pkey, u32 slid, u32 dlid, u8 sc5,
696 		const struct ib_grh *old_grh)
697 {
698 	u64 pbc, pbc_flags = 0;
699 	u32 bth0, plen, vl, hwords = 5;
700 	u16 lrh0;
701 	u8 sl = ibp->sc_to_sl[sc5];
702 	struct hfi1_opa_header hdr;
703 	struct ib_other_headers *ohdr;
704 	struct pio_buf *pbuf;
705 	struct send_context *ctxt = qp_to_send_context(qp, sc5);
706 	struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
707 
708 	hdr.hdr_type = HFI1_PKT_TYPE_9B;
709 	if (old_grh) {
710 		struct ib_grh *grh = &hdr.ibh.u.l.grh;
711 
712 		grh->version_tclass_flow = old_grh->version_tclass_flow;
713 		grh->paylen = cpu_to_be16(
714 			(hwords - LRH_9B_DWORDS + SIZE_OF_CRC) << 2);
715 		grh->hop_limit = 0xff;
716 		grh->sgid = old_grh->dgid;
717 		grh->dgid = old_grh->sgid;
718 		ohdr = &hdr.ibh.u.l.oth;
719 		lrh0 = HFI1_LRH_GRH;
720 		hwords += sizeof(struct ib_grh) / sizeof(u32);
721 	} else {
722 		ohdr = &hdr.ibh.u.oth;
723 		lrh0 = HFI1_LRH_BTH;
724 	}
725 
726 	lrh0 |= (sc5 & 0xf) << 12 | sl << 4;
727 
728 	bth0 = pkey | (IB_OPCODE_CNP << 24);
729 	ohdr->bth[0] = cpu_to_be32(bth0);
730 
731 	ohdr->bth[1] = cpu_to_be32(remote_qpn | (1 << IB_BECN_SHIFT));
732 	ohdr->bth[2] = 0; /* PSN 0 */
733 
734 	hfi1_make_ib_hdr(&hdr.ibh, lrh0, hwords + SIZE_OF_CRC, dlid, slid);
735 	plen = 2 /* PBC */ + hwords;
736 	pbc_flags |= (ib_is_sc5(sc5) << PBC_DC_INFO_SHIFT);
737 	vl = sc_to_vlt(ppd->dd, sc5);
738 	pbc = create_pbc(ppd, pbc_flags, qp->srate_mbps, vl, plen);
739 	if (ctxt) {
740 		pbuf = sc_buffer_alloc(ctxt, plen, NULL, NULL);
741 		if (!IS_ERR_OR_NULL(pbuf)) {
742 			trace_pio_output_ibhdr(ppd->dd, &hdr, sc5);
743 			ppd->dd->pio_inline_send(ppd->dd, pbuf, pbc,
744 						 &hdr, hwords);
745 		}
746 	}
747 }
748 
749 /*
750  * opa_smp_check() - Do the regular pkey checking, and the additional
751  * checks for SMPs specified in OPAv1 rev 1.0, 9/19/2016 update, section
752  * 9.10.25 ("SMA Packet Checks").
753  *
754  * Note that:
755  *   - Checks are done using the pkey directly from the packet's BTH,
756  *     and specifically _not_ the pkey that we attach to the completion,
757  *     which may be different.
758  *   - These checks are specifically for "non-local" SMPs (i.e., SMPs
759  *     which originated on another node). SMPs which are sent from, and
760  *     destined to this node are checked in opa_local_smp_check().
761  *
762  * At the point where opa_smp_check() is called, we know:
763  *   - destination QP is QP0
764  *
765  * opa_smp_check() returns 0 if all checks succeed, 1 otherwise.
766  */
767 static int opa_smp_check(struct hfi1_ibport *ibp, u16 pkey, u8 sc5,
768 			 struct rvt_qp *qp, u16 slid, struct opa_smp *smp)
769 {
770 	struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
771 
772 	/*
773 	 * I don't think it's possible for us to get here with sc != 0xf,
774 	 * but check it to be certain.
775 	 */
776 	if (sc5 != 0xf)
777 		return 1;
778 
779 	if (rcv_pkey_check(ppd, pkey, sc5, slid))
780 		return 1;
781 
782 	/*
783 	 * At this point we know (and so don't need to check again) that
784 	 * the pkey is either LIM_MGMT_P_KEY, or FULL_MGMT_P_KEY
785 	 * (see ingress_pkey_check).
786 	 */
787 	if (smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE &&
788 	    smp->mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED) {
789 		ingress_pkey_table_fail(ppd, pkey, slid);
790 		return 1;
791 	}
792 
793 	/*
794 	 * SMPs fall into one of four (disjoint) categories:
795 	 * SMA request, SMA response, SMA trap, or SMA trap repress.
796 	 * Our response depends, in part, on which type of SMP we're
797 	 * processing.
798 	 *
799 	 * If this is an SMA response, skip the check here.
800 	 *
801 	 * If this is an SMA request or SMA trap repress:
802 	 *   - pkey != FULL_MGMT_P_KEY =>
803 	 *       increment port recv constraint errors, drop MAD
804 	 *
805 	 * Otherwise:
806 	 *    - accept if the port is running an SM
807 	 *    - drop MAD if it's an SMA trap
808 	 *    - pkey == FULL_MGMT_P_KEY =>
809 	 *        reply with unsupported method
810 	 *    - pkey != FULL_MGMT_P_KEY =>
811 	 *	  increment port recv constraint errors, drop MAD
812 	 */
813 	switch (smp->method) {
814 	case IB_MGMT_METHOD_GET_RESP:
815 	case IB_MGMT_METHOD_REPORT_RESP:
816 		break;
817 	case IB_MGMT_METHOD_GET:
818 	case IB_MGMT_METHOD_SET:
819 	case IB_MGMT_METHOD_REPORT:
820 	case IB_MGMT_METHOD_TRAP_REPRESS:
821 		if (pkey != FULL_MGMT_P_KEY) {
822 			ingress_pkey_table_fail(ppd, pkey, slid);
823 			return 1;
824 		}
825 		break;
826 	default:
827 		if (ibp->rvp.port_cap_flags & IB_PORT_SM)
828 			return 0;
829 		if (smp->method == IB_MGMT_METHOD_TRAP)
830 			return 1;
831 		if (pkey == FULL_MGMT_P_KEY) {
832 			smp->status |= IB_SMP_UNSUP_METHOD;
833 			return 0;
834 		}
835 		ingress_pkey_table_fail(ppd, pkey, slid);
836 		return 1;
837 	}
838 	return 0;
839 }
840 
841 /**
842  * hfi1_ud_rcv - receive an incoming UD packet
843  * @ibp: the port the packet came in on
844  * @hdr: the packet header
845  * @rcv_flags: flags relevant to rcv processing
846  * @data: the packet data
847  * @tlen: the packet length
848  * @qp: the QP the packet came on
849  *
850  * This is called from qp_rcv() to process an incoming UD packet
851  * for the given QP.
852  * Called at interrupt level.
853  */
854 void hfi1_ud_rcv(struct hfi1_packet *packet)
855 {
856 	u32 hdrsize = packet->hlen;
857 	struct ib_wc wc;
858 	u32 src_qp;
859 	u16 pkey;
860 	int mgmt_pkey_idx = -1;
861 	struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd);
862 	struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
863 	void *data = packet->payload;
864 	u32 tlen = packet->tlen;
865 	struct rvt_qp *qp = packet->qp;
866 	u8 sc5 = packet->sc;
867 	u8 sl_from_sc;
868 	u8 opcode = packet->opcode;
869 	u8 sl = packet->sl;
870 	u32 dlid = packet->dlid;
871 	u32 slid = packet->slid;
872 	u8 extra_bytes;
873 	u8 l4 = 0;
874 	bool dlid_is_permissive;
875 	bool slid_is_permissive;
876 	bool solicited = false;
877 
878 	extra_bytes = packet->pad + packet->extra_byte + (SIZE_OF_CRC << 2);
879 
880 	if (packet->etype == RHF_RCV_TYPE_BYPASS) {
881 		u32 permissive_lid =
882 			opa_get_lid(be32_to_cpu(OPA_LID_PERMISSIVE), 16B);
883 
884 		l4 = hfi1_16B_get_l4(packet->hdr);
885 		pkey = hfi1_16B_get_pkey(packet->hdr);
886 		dlid_is_permissive = (dlid == permissive_lid);
887 		slid_is_permissive = (slid == permissive_lid);
888 	} else {
889 		pkey = ib_bth_get_pkey(packet->ohdr);
890 		dlid_is_permissive = (dlid == be16_to_cpu(IB_LID_PERMISSIVE));
891 		slid_is_permissive = (slid == be16_to_cpu(IB_LID_PERMISSIVE));
892 	}
893 	sl_from_sc = ibp->sc_to_sl[sc5];
894 
895 	if (likely(l4 != OPA_16B_L4_FM)) {
896 		src_qp = ib_get_sqpn(packet->ohdr);
897 		solicited = ib_bth_is_solicited(packet->ohdr);
898 	} else {
899 		src_qp = hfi1_16B_get_src_qpn(packet->mgmt);
900 	}
901 
902 	process_ecn(qp, packet);
903 	/*
904 	 * Get the number of bytes the message was padded by
905 	 * and drop incomplete packets.
906 	 */
907 	if (unlikely(tlen < (hdrsize + extra_bytes)))
908 		goto drop;
909 
910 	tlen -= hdrsize + extra_bytes;
911 
912 	/*
913 	 * Check that the permissive LID is only used on QP0
914 	 * and the QKEY matches (see 9.6.1.4.1 and 9.6.1.5.1).
915 	 */
916 	if (qp->ibqp.qp_num) {
917 		if (unlikely(dlid_is_permissive || slid_is_permissive))
918 			goto drop;
919 		if (qp->ibqp.qp_num > 1) {
920 			if (unlikely(rcv_pkey_check(ppd, pkey, sc5, slid))) {
921 				/*
922 				 * Traps will not be sent for packets dropped
923 				 * by the HW. This is fine, as sending trap
924 				 * for invalid pkeys is optional according to
925 				 * IB spec (release 1.3, section 10.9.4)
926 				 */
927 				hfi1_bad_pkey(ibp,
928 					      pkey, sl,
929 					      src_qp, qp->ibqp.qp_num,
930 					      slid, dlid);
931 				return;
932 			}
933 		} else {
934 			/* GSI packet */
935 			mgmt_pkey_idx = hfi1_lookup_pkey_idx(ibp, pkey);
936 			if (mgmt_pkey_idx < 0)
937 				goto drop;
938 		}
939 		if (unlikely(l4 != OPA_16B_L4_FM &&
940 			     ib_get_qkey(packet->ohdr) != qp->qkey))
941 			return; /* Silent drop */
942 
943 		/* Drop invalid MAD packets (see 13.5.3.1). */
944 		if (unlikely(qp->ibqp.qp_num == 1 &&
945 			     (tlen > 2048 || (sc5 == 0xF))))
946 			goto drop;
947 	} else {
948 		/* Received on QP0, and so by definition, this is an SMP */
949 		struct opa_smp *smp = (struct opa_smp *)data;
950 
951 		if (opa_smp_check(ibp, pkey, sc5, qp, slid, smp))
952 			goto drop;
953 
954 		if (tlen > 2048)
955 			goto drop;
956 		if ((dlid_is_permissive || slid_is_permissive) &&
957 		    smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
958 			goto drop;
959 
960 		/* look up SMI pkey */
961 		mgmt_pkey_idx = hfi1_lookup_pkey_idx(ibp, pkey);
962 		if (mgmt_pkey_idx < 0)
963 			goto drop;
964 	}
965 
966 	if (qp->ibqp.qp_num > 1 &&
967 	    opcode == IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE) {
968 		wc.ex.imm_data = packet->ohdr->u.ud.imm_data;
969 		wc.wc_flags = IB_WC_WITH_IMM;
970 	} else if (opcode == IB_OPCODE_UD_SEND_ONLY) {
971 		wc.ex.imm_data = 0;
972 		wc.wc_flags = 0;
973 	} else {
974 		goto drop;
975 	}
976 
977 	/*
978 	 * A GRH is expected to precede the data even if not
979 	 * present on the wire.
980 	 */
981 	wc.byte_len = tlen + sizeof(struct ib_grh);
982 
983 	/*
984 	 * Get the next work request entry to find where to put the data.
985 	 */
986 	if (qp->r_flags & RVT_R_REUSE_SGE) {
987 		qp->r_flags &= ~RVT_R_REUSE_SGE;
988 	} else {
989 		int ret;
990 
991 		ret = rvt_get_rwqe(qp, false);
992 		if (ret < 0) {
993 			rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
994 			return;
995 		}
996 		if (!ret) {
997 			if (qp->ibqp.qp_num == 0)
998 				ibp->rvp.n_vl15_dropped++;
999 			return;
1000 		}
1001 	}
1002 	/* Silently drop packets which are too big. */
1003 	if (unlikely(wc.byte_len > qp->r_len)) {
1004 		qp->r_flags |= RVT_R_REUSE_SGE;
1005 		goto drop;
1006 	}
1007 	if (packet->grh) {
1008 		rvt_copy_sge(qp, &qp->r_sge, packet->grh,
1009 			     sizeof(struct ib_grh), true, false);
1010 		wc.wc_flags |= IB_WC_GRH;
1011 	} else if (packet->etype == RHF_RCV_TYPE_BYPASS) {
1012 		struct ib_grh grh;
1013 		/*
1014 		 * Assuming we only created 16B on the send side
1015 		 * if we want to use large LIDs, since GRH was stripped
1016 		 * out when creating 16B, add back the GRH here.
1017 		 */
1018 		hfi1_make_ext_grh(packet, &grh, slid, dlid);
1019 		rvt_copy_sge(qp, &qp->r_sge, &grh,
1020 			     sizeof(struct ib_grh), true, false);
1021 		wc.wc_flags |= IB_WC_GRH;
1022 	} else {
1023 		rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true);
1024 	}
1025 	rvt_copy_sge(qp, &qp->r_sge, data, wc.byte_len - sizeof(struct ib_grh),
1026 		     true, false);
1027 	rvt_put_ss(&qp->r_sge);
1028 	if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags))
1029 		return;
1030 	wc.wr_id = qp->r_wr_id;
1031 	wc.status = IB_WC_SUCCESS;
1032 	wc.opcode = IB_WC_RECV;
1033 	wc.vendor_err = 0;
1034 	wc.qp = &qp->ibqp;
1035 	wc.src_qp = src_qp;
1036 
1037 	if (qp->ibqp.qp_type == IB_QPT_GSI ||
1038 	    qp->ibqp.qp_type == IB_QPT_SMI) {
1039 		if (mgmt_pkey_idx < 0) {
1040 			if (net_ratelimit()) {
1041 				struct hfi1_devdata *dd = ppd->dd;
1042 
1043 				dd_dev_err(dd, "QP type %d mgmt_pkey_idx < 0 and packet not dropped???\n",
1044 					   qp->ibqp.qp_type);
1045 				mgmt_pkey_idx = 0;
1046 			}
1047 		}
1048 		wc.pkey_index = (unsigned)mgmt_pkey_idx;
1049 	} else {
1050 		wc.pkey_index = 0;
1051 	}
1052 	if (slid_is_permissive)
1053 		slid = be32_to_cpu(OPA_LID_PERMISSIVE);
1054 	wc.slid = slid & U16_MAX;
1055 	wc.sl = sl_from_sc;
1056 
1057 	/*
1058 	 * Save the LMC lower bits if the destination LID is a unicast LID.
1059 	 */
1060 	wc.dlid_path_bits = hfi1_check_mcast(dlid) ? 0 :
1061 		dlid & ((1 << ppd_from_ibp(ibp)->lmc) - 1);
1062 	wc.port_num = qp->port_num;
1063 	/* Signal completion event if the solicited bit is set. */
1064 	rvt_recv_cq(qp, &wc, solicited);
1065 	return;
1066 
1067 drop:
1068 	ibp->rvp.n_pkt_drops++;
1069 }
1070