1// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
   2/*
   3 * Copyright(c) 2015 - 2019 Intel Corporation.
   4 */
   5
   6#include <linux/net.h>
   7#include <rdma/ib_smi.h>
   8
   9#include "hfi.h"
  10#include "mad.h"
  11#include "verbs_txreq.h"
  12#include "trace_ibhdrs.h"
  13#include "qp.h"
  14
  15/* We support only two types - 9B and 16B for now */
  16static const hfi1_make_req hfi1_make_ud_req_tbl[2] = {
  17	[HFI1_PKT_TYPE_9B] = &hfi1_make_ud_req_9B,
  18	[HFI1_PKT_TYPE_16B] = &hfi1_make_ud_req_16B
  19};
  20
  21/**
  22 * ud_loopback - handle send on loopback QPs
  23 * @sqp: the sending QP
  24 * @swqe: the send work request
  25 *
  26 * This is called from hfi1_make_ud_req() to forward a WQE addressed
  27 * to the same HFI.
  28 * Note that the receive interrupt handler may be calling hfi1_ud_rcv()
  29 * while this is being called.
  30 */
  31static void ud_loopback(struct rvt_qp *sqp, struct rvt_swqe *swqe)
  32{
  33	struct hfi1_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num);
  34	struct hfi1_pportdata *ppd;
  35	struct hfi1_qp_priv *priv = sqp->priv;
  36	struct rvt_qp *qp;
  37	struct rdma_ah_attr *ah_attr;
  38	unsigned long flags;
  39	struct rvt_sge_state ssge;
  40	struct rvt_sge *sge;
  41	struct ib_wc wc;
  42	u32 length;
  43	enum ib_qp_type sqptype, dqptype;
  44
  45	rcu_read_lock();
  46
  47	qp = rvt_lookup_qpn(ib_to_rvt(sqp->ibqp.device), &ibp->rvp,
  48			    rvt_get_swqe_remote_qpn(swqe));
  49	if (!qp) {
  50		ibp->rvp.n_pkt_drops++;
  51		rcu_read_unlock();
  52		return;
  53	}
  54
  55	sqptype = sqp->ibqp.qp_type == IB_QPT_GSI ?
  56			IB_QPT_UD : sqp->ibqp.qp_type;
  57	dqptype = qp->ibqp.qp_type == IB_QPT_GSI ?
  58			IB_QPT_UD : qp->ibqp.qp_type;
  59
  60	if (dqptype != sqptype ||
  61	    !(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) {
  62		ibp->rvp.n_pkt_drops++;
  63		goto drop;
  64	}
  65
  66	ah_attr = rvt_get_swqe_ah_attr(swqe);
  67	ppd = ppd_from_ibp(ibp);
  68
  69	if (qp->ibqp.qp_num > 1) {
  70		u16 pkey;
  71		u32 slid;
  72		u8 sc5 = ibp->sl_to_sc[rdma_ah_get_sl(ah_attr)];
  73
  74		pkey = hfi1_get_pkey(ibp, sqp->s_pkey_index);
  75		slid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) &
  76				   ((1 << ppd->lmc) - 1));
  77		if (unlikely(ingress_pkey_check(ppd, pkey, sc5,
  78						qp->s_pkey_index,
  79						slid, false))) {
  80			hfi1_bad_pkey(ibp, pkey,
  81				      rdma_ah_get_sl(ah_attr),
  82				      sqp->ibqp.qp_num, qp->ibqp.qp_num,
  83				      slid, rdma_ah_get_dlid(ah_attr));
  84			goto drop;
  85		}
  86	}
  87
  88	/*
  89	 * Check that the qkey matches (except for QP0, see 9.6.1.4.1).
  90	 * Qkeys with the high order bit set mean use the
  91	 * qkey from the QP context instead of the WR (see 10.2.5).
  92	 */
  93	if (qp->ibqp.qp_num) {
  94		u32 qkey;
  95
  96		qkey = (int)rvt_get_swqe_remote_qkey(swqe) < 0 ?
  97			sqp->qkey : rvt_get_swqe_remote_qkey(swqe);
  98		if (unlikely(qkey != qp->qkey))
  99			goto drop; /* silently drop per IBTA spec */
 100	}
 101
 102	/*
 103	 * A GRH is expected to precede the data even if not
 104	 * present on the wire.
 105	 */
 106	length = swqe->length;
 107	memset(&wc, 0, sizeof(wc));
 108	wc.byte_len = length + sizeof(struct ib_grh);
 109
 110	if (swqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
 111		wc.wc_flags = IB_WC_WITH_IMM;
 112		wc.ex.imm_data = swqe->wr.ex.imm_data;
 113	}
 114
 115	spin_lock_irqsave(&qp->r_lock, flags);
 116
 117	/*
 118	 * Get the next work request entry to find where to put the data.
 119	 */
 120	if (qp->r_flags & RVT_R_REUSE_SGE) {
 121		qp->r_flags &= ~RVT_R_REUSE_SGE;
 122	} else {
 123		int ret;
 124
 125		ret = rvt_get_rwqe(qp, false);
 126		if (ret < 0) {
 127			rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
 128			goto bail_unlock;
 129		}
 130		if (!ret) {
 131			if (qp->ibqp.qp_num == 0)
 132				ibp->rvp.n_vl15_dropped++;
 133			goto bail_unlock;
 134		}
 135	}
 136	/* Silently drop packets which are too big. */
 137	if (unlikely(wc.byte_len > qp->r_len)) {
 138		qp->r_flags |= RVT_R_REUSE_SGE;
 139		ibp->rvp.n_pkt_drops++;
 140		goto bail_unlock;
 141	}
 142
 143	if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
 144		struct ib_grh grh;
 145		struct ib_global_route grd = *(rdma_ah_read_grh(ah_attr));
 146
 147		/*
 148		 * For loopback packets with extended LIDs, the
 149		 * sgid_index in the GRH is 0 and the dgid is
 150		 * OPA GID of the sender. While creating a response
 151		 * to the loopback packet, IB core creates the new
 152		 * sgid_index from the DGID and that will be the
 153		 * OPA_GID_INDEX. The new dgid is from the sgid
 154		 * index and that will be in the IB GID format.
 155		 *
 156		 * We now have a case where the sent packet had a
 157		 * different sgid_index and dgid compared to the
 158		 * one that was received in response.
 159		 *
 160		 * Fix this inconsistency.
 161		 */
 162		if (priv->hdr_type == HFI1_PKT_TYPE_16B) {
 163			if (grd.sgid_index == 0)
 164				grd.sgid_index = OPA_GID_INDEX;
 165
 166			if (ib_is_opa_gid(&grd.dgid))
 167				grd.dgid.global.interface_id =
 168				cpu_to_be64(ppd->guids[HFI1_PORT_GUID_INDEX]);
 169		}
 170
 171		hfi1_make_grh(ibp, &grh, &grd, 0, 0);
 172		rvt_copy_sge(qp, &qp->r_sge, &grh,
 173			     sizeof(grh), true, false);
 174		wc.wc_flags |= IB_WC_GRH;
 175	} else {
 176		rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true);
 177	}
 178	ssge.sg_list = swqe->sg_list + 1;
 179	ssge.sge = *swqe->sg_list;
 180	ssge.num_sge = swqe->wr.num_sge;
 181	sge = &ssge.sge;
 182	while (length) {
 183		u32 len = rvt_get_sge_length(sge, length);
 184
 185		WARN_ON_ONCE(len == 0);
 186		rvt_copy_sge(qp, &qp->r_sge, sge->vaddr, len, true, false);
 187		rvt_update_sge(&ssge, len, false);
 188		length -= len;
 189	}
 190	rvt_put_ss(&qp->r_sge);
 191	if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags))
 192		goto bail_unlock;
 193	wc.wr_id = qp->r_wr_id;
 194	wc.status = IB_WC_SUCCESS;
 195	wc.opcode = IB_WC_RECV;
 196	wc.qp = &qp->ibqp;
 197	wc.src_qp = sqp->ibqp.qp_num;
 198	if (qp->ibqp.qp_type == IB_QPT_GSI || qp->ibqp.qp_type == IB_QPT_SMI) {
 199		if (sqp->ibqp.qp_type == IB_QPT_GSI ||
 200		    sqp->ibqp.qp_type == IB_QPT_SMI)
 201			wc.pkey_index = rvt_get_swqe_pkey_index(swqe);
 202		else
 203			wc.pkey_index = sqp->s_pkey_index;
 204	} else {
 205		wc.pkey_index = 0;
 206	}
 207	wc.slid = (ppd->lid | (rdma_ah_get_path_bits(ah_attr) &
 208				   ((1 << ppd->lmc) - 1))) & U16_MAX;
 209	/* Check for loopback when the port lid is not set */
 210	if (wc.slid == 0 && sqp->ibqp.qp_type == IB_QPT_GSI)
 211		wc.slid = be16_to_cpu(IB_LID_PERMISSIVE);
 212	wc.sl = rdma_ah_get_sl(ah_attr);
 213	wc.dlid_path_bits = rdma_ah_get_dlid(ah_attr) & ((1 << ppd->lmc) - 1);
 214	wc.port_num = qp->port_num;
 215	/* Signal completion event if the solicited bit is set. */
 216	rvt_recv_cq(qp, &wc, swqe->wr.send_flags & IB_SEND_SOLICITED);
 217	ibp->rvp.n_loop_pkts++;
 218bail_unlock:
 219	spin_unlock_irqrestore(&qp->r_lock, flags);
 220drop:
 221	rcu_read_unlock();
 222}
 223
 224static void hfi1_make_bth_deth(struct rvt_qp *qp, struct rvt_swqe *wqe,
 225			       struct ib_other_headers *ohdr,
 226			       u16 *pkey, u32 extra_bytes, bool bypass)
 227{
 228	u32 bth0;
 229	struct hfi1_ibport *ibp;
 230
 231	ibp = to_iport(qp->ibqp.device, qp->port_num);
 232	if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
 233		ohdr->u.ud.imm_data = wqe->wr.ex.imm_data;
 234		bth0 = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE << 24;
 235	} else {
 236		bth0 = IB_OPCODE_UD_SEND_ONLY << 24;
 237	}
 238
 239	if (wqe->wr.send_flags & IB_SEND_SOLICITED)
 240		bth0 |= IB_BTH_SOLICITED;
 241	bth0 |= extra_bytes << 20;
 242	if (qp->ibqp.qp_type == IB_QPT_GSI || qp->ibqp.qp_type == IB_QPT_SMI)
 243		*pkey = hfi1_get_pkey(ibp, rvt_get_swqe_pkey_index(wqe));
 244	else
 245		*pkey = hfi1_get_pkey(ibp, qp->s_pkey_index);
 246	if (!bypass)
 247		bth0 |= *pkey;
 248	ohdr->bth[0] = cpu_to_be32(bth0);
 249	ohdr->bth[1] = cpu_to_be32(rvt_get_swqe_remote_qpn(wqe));
 250	ohdr->bth[2] = cpu_to_be32(mask_psn(wqe->psn));
 251	/*
 252	 * Qkeys with the high order bit set mean use the
 253	 * qkey from the QP context instead of the WR (see 10.2.5).
 254	 */
 255	ohdr->u.ud.deth[0] =
 256		cpu_to_be32((int)rvt_get_swqe_remote_qkey(wqe) < 0 ? qp->qkey :
 257			    rvt_get_swqe_remote_qkey(wqe));
 258	ohdr->u.ud.deth[1] = cpu_to_be32(qp->ibqp.qp_num);
 259}
 260
 261void hfi1_make_ud_req_9B(struct rvt_qp *qp, struct hfi1_pkt_state *ps,
 262			 struct rvt_swqe *wqe)
 263{
 264	u32 nwords, extra_bytes;
 265	u16 len, slid, dlid, pkey;
 266	u16 lrh0 = 0;
 267	u8 sc5;
 268	struct hfi1_qp_priv *priv = qp->priv;
 269	struct ib_other_headers *ohdr;
 270	struct rdma_ah_attr *ah_attr;
 271	struct hfi1_pportdata *ppd;
 272	struct hfi1_ibport *ibp;
 273	struct ib_grh *grh;
 274
 275	ibp = to_iport(qp->ibqp.device, qp->port_num);
 276	ppd = ppd_from_ibp(ibp);
 277	ah_attr = rvt_get_swqe_ah_attr(wqe);
 278
 279	extra_bytes = -wqe->length & 3;
 280	nwords = ((wqe->length + extra_bytes) >> 2) + SIZE_OF_CRC;
 281	/* header size in dwords LRH+BTH+DETH = (8+12+8)/4. */
 282	ps->s_txreq->hdr_dwords = 7;
 283	if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM)
 284		ps->s_txreq->hdr_dwords++;
 285
 286	if (rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) {
 287		grh = &ps->s_txreq->phdr.hdr.ibh.u.l.grh;
 288		ps->s_txreq->hdr_dwords +=
 289			hfi1_make_grh(ibp, grh, rdma_ah_read_grh(ah_attr),
 290				      ps->s_txreq->hdr_dwords - LRH_9B_DWORDS,
 291				      nwords);
 292		lrh0 = HFI1_LRH_GRH;
 293		ohdr = &ps->s_txreq->phdr.hdr.ibh.u.l.oth;
 294	} else {
 295		lrh0 = HFI1_LRH_BTH;
 296		ohdr = &ps->s_txreq->phdr.hdr.ibh.u.oth;
 297	}
 298
 299	sc5 = ibp->sl_to_sc[rdma_ah_get_sl(ah_attr)];
 300	lrh0 |= (rdma_ah_get_sl(ah_attr) & 0xf) << 4;
 301	if (qp->ibqp.qp_type == IB_QPT_SMI) {
 302		lrh0 |= 0xF000; /* Set VL (see ch. 13.5.3.1) */
 303		priv->s_sc = 0xf;
 304	} else {
 305		lrh0 |= (sc5 & 0xf) << 12;
 306		priv->s_sc = sc5;
 307	}
 308
 309	dlid = opa_get_lid(rdma_ah_get_dlid(ah_attr), 9B);
 310	if (dlid == be16_to_cpu(IB_LID_PERMISSIVE)) {
 311		slid = be16_to_cpu(IB_LID_PERMISSIVE);
 312	} else {
 313		u16 lid = (u16)ppd->lid;
 314
 315		if (lid) {
 316			lid |= rdma_ah_get_path_bits(ah_attr) &
 317				((1 << ppd->lmc) - 1);
 318			slid = lid;
 319		} else {
 320			slid = be16_to_cpu(IB_LID_PERMISSIVE);
 321		}
 322	}
 323	hfi1_make_bth_deth(qp, wqe, ohdr, &pkey, extra_bytes, false);
 324	len = ps->s_txreq->hdr_dwords + nwords;
 325
 326	/* Setup the packet */
 327	ps->s_txreq->phdr.hdr.hdr_type = HFI1_PKT_TYPE_9B;
 328	hfi1_make_ib_hdr(&ps->s_txreq->phdr.hdr.ibh,
 329			 lrh0, len, dlid, slid);
 330}
 331
 332void hfi1_make_ud_req_16B(struct rvt_qp *qp, struct hfi1_pkt_state *ps,
 333			  struct rvt_swqe *wqe)
 334{
 335	struct hfi1_qp_priv *priv = qp->priv;
 336	struct ib_other_headers *ohdr;
 337	struct rdma_ah_attr *ah_attr;
 338	struct hfi1_pportdata *ppd;
 339	struct hfi1_ibport *ibp;
 340	u32 dlid, slid, nwords, extra_bytes;
 341	u32 dest_qp = rvt_get_swqe_remote_qpn(wqe);
 342	u32 src_qp = qp->ibqp.qp_num;
 343	u16 len, pkey;
 344	u8 l4, sc5;
 345	bool is_mgmt = false;
 346
 347	ibp = to_iport(qp->ibqp.device, qp->port_num);
 348	ppd = ppd_from_ibp(ibp);
 349	ah_attr = rvt_get_swqe_ah_attr(wqe);
 350
 351	/*
 352	 * Build 16B Management Packet if either the destination
 353	 * or source queue pair number is 0 or 1.
 354	 */
 355	if (dest_qp == 0 || src_qp == 0 || dest_qp == 1 || src_qp == 1) {
 356		/* header size in dwords 16B LRH+L4_FM = (16+8)/4. */
 357		ps->s_txreq->hdr_dwords = 6;
 358		is_mgmt = true;
 359	} else {
 360		/* header size in dwords 16B LRH+BTH+DETH = (16+12+8)/4. */
 361		ps->s_txreq->hdr_dwords = 9;
 362		if (wqe->wr.opcode == IB_WR_SEND_WITH_IMM)
 363			ps->s_txreq->hdr_dwords++;
 364	}
 365
 366	/* SW provides space for CRC and LT for bypass packets. */
 367	extra_bytes = hfi1_get_16b_padding((ps->s_txreq->hdr_dwords << 2),
 368					   wqe->length);
 369	nwords = ((wqe->length + extra_bytes + SIZE_OF_LT) >> 2) + SIZE_OF_CRC;
 370
 371	if ((rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH) &&
 372	    hfi1_check_mcast(rdma_ah_get_dlid(ah_attr))) {
 373		struct ib_grh *grh;
 374		struct ib_global_route *grd = rdma_ah_retrieve_grh(ah_attr);
 375		/*
 376		 * Ensure OPA GIDs are transformed to IB gids
 377		 * before creating the GRH.
 378		 */
 379		if (grd->sgid_index == OPA_GID_INDEX) {
 380			dd_dev_warn(ppd->dd, "Bad sgid_index. sgid_index: %d\n",
 381				    grd->sgid_index);
 382			grd->sgid_index = 0;
 383		}
 384		grh = &ps->s_txreq->phdr.hdr.opah.u.l.grh;
 385		ps->s_txreq->hdr_dwords += hfi1_make_grh(
 386			ibp, grh, grd,
 387			ps->s_txreq->hdr_dwords - LRH_16B_DWORDS,
 388			nwords);
 389		ohdr = &ps->s_txreq->phdr.hdr.opah.u.l.oth;
 390		l4 = OPA_16B_L4_IB_GLOBAL;
 391	} else {
 392		ohdr = &ps->s_txreq->phdr.hdr.opah.u.oth;
 393		l4 = OPA_16B_L4_IB_LOCAL;
 394	}
 395
 396	sc5 = ibp->sl_to_sc[rdma_ah_get_sl(ah_attr)];
 397	if (qp->ibqp.qp_type == IB_QPT_SMI)
 398		priv->s_sc = 0xf;
 399	else
 400		priv->s_sc = sc5;
 401
 402	dlid = opa_get_lid(rdma_ah_get_dlid(ah_attr), 16B);
 403	if (!ppd->lid)
 404		slid = be32_to_cpu(OPA_LID_PERMISSIVE);
 405	else
 406		slid = ppd->lid | (rdma_ah_get_path_bits(ah_attr) &
 407			   ((1 << ppd->lmc) - 1));
 408
 409	if (is_mgmt) {
 410		l4 = OPA_16B_L4_FM;
 411		pkey = hfi1_get_pkey(ibp, rvt_get_swqe_pkey_index(wqe));
 412		hfi1_16B_set_qpn(&ps->s_txreq->phdr.hdr.opah.u.mgmt,
 413				 dest_qp, src_qp);
 414	} else {
 415		hfi1_make_bth_deth(qp, wqe, ohdr, &pkey, extra_bytes, true);
 416	}
 417	/* Convert dwords to flits */
 418	len = (ps->s_txreq->hdr_dwords + nwords) >> 1;
 419
 420	/* Setup the packet */
 421	ps->s_txreq->phdr.hdr.hdr_type = HFI1_PKT_TYPE_16B;
 422	hfi1_make_16b_hdr(&ps->s_txreq->phdr.hdr.opah,
 423			  slid, dlid, len, pkey, 0, 0, l4, priv->s_sc);
 424}
 425
 426/**
 427 * hfi1_make_ud_req - construct a UD request packet
 428 * @qp: the QP
 429 * @ps: the current packet state
 430 *
 431 * Assume s_lock is held.
 432 *
 433 * Return 1 if constructed; otherwise, return 0.
 434 */
 435int hfi1_make_ud_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
 436{
 437	struct hfi1_qp_priv *priv = qp->priv;
 438	struct rdma_ah_attr *ah_attr;
 439	struct hfi1_pportdata *ppd;
 440	struct hfi1_ibport *ibp;
 441	struct rvt_swqe *wqe;
 442	int next_cur;
 443	u32 lid;
 444
 445	ps->s_txreq = get_txreq(ps->dev, qp);
 446	if (!ps->s_txreq)
 447		goto bail_no_tx;
 448
 449	if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_NEXT_SEND_OK)) {
 450		if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
 451			goto bail;
 452		/* We are in the error state, flush the work request. */
 453		if (qp->s_last == READ_ONCE(qp->s_head))
 454			goto bail;
 455		/* If DMAs are in progress, we can't flush immediately. */
 456		if (iowait_sdma_pending(&priv->s_iowait)) {
 457			qp->s_flags |= RVT_S_WAIT_DMA;
 458			goto bail;
 459		}
 460		wqe = rvt_get_swqe_ptr(qp, qp->s_last);
 461		rvt_send_complete(qp, wqe, IB_WC_WR_FLUSH_ERR);
 462		goto done_free_tx;
 463	}
 464
 465	/* see post_one_send() */
 466	if (qp->s_cur == READ_ONCE(qp->s_head))
 467		goto bail;
 468
 469	wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
 470	next_cur = qp->s_cur + 1;
 471	if (next_cur >= qp->s_size)
 472		next_cur = 0;
 473
 474	/* Construct the header. */
 475	ibp = to_iport(qp->ibqp.device, qp->port_num);
 476	ppd = ppd_from_ibp(ibp);
 477	ah_attr = rvt_get_swqe_ah_attr(wqe);
 478	priv->hdr_type = hfi1_get_hdr_type(ppd->lid, ah_attr);
 479	if ((!hfi1_check_mcast(rdma_ah_get_dlid(ah_attr))) ||
 480	    (rdma_ah_get_dlid(ah_attr) == be32_to_cpu(OPA_LID_PERMISSIVE))) {
 481		lid = rdma_ah_get_dlid(ah_attr) & ~((1 << ppd->lmc) - 1);
 482		if (unlikely(!loopback &&
 483			     ((lid == ppd->lid) ||
 484			      ((lid == be32_to_cpu(OPA_LID_PERMISSIVE)) &&
 485			       (qp->ibqp.qp_type == IB_QPT_GSI))))) {
 486			unsigned long tflags = ps->flags;
 487			/*
 488			 * If DMAs are in progress, we can't generate
 489			 * a completion for the loopback packet since
 490			 * it would be out of order.
 491			 * Instead of waiting, we could queue a
 492			 * zero length descriptor so we get a callback.
 493			 */
 494			if (iowait_sdma_pending(&priv->s_iowait)) {
 495				qp->s_flags |= RVT_S_WAIT_DMA;
 496				goto bail;
 497			}
 498			qp->s_cur = next_cur;
 499			spin_unlock_irqrestore(&qp->s_lock, tflags);
 500			ud_loopback(qp, wqe);
 501			spin_lock_irqsave(&qp->s_lock, tflags);
 502			ps->flags = tflags;
 503			rvt_send_complete(qp, wqe, IB_WC_SUCCESS);
 504			goto done_free_tx;
 505		}
 506	}
 507
 508	qp->s_cur = next_cur;
 509	ps->s_txreq->s_cur_size = wqe->length;
 510	ps->s_txreq->ss = &qp->s_sge;
 511	qp->s_srate = rdma_ah_get_static_rate(ah_attr);
 512	qp->srate_mbps = ib_rate_to_mbps(qp->s_srate);
 513	qp->s_wqe = wqe;
 514	qp->s_sge.sge = wqe->sg_list[0];
 515	qp->s_sge.sg_list = wqe->sg_list + 1;
 516	qp->s_sge.num_sge = wqe->wr.num_sge;
 517	qp->s_sge.total_len = wqe->length;
 518
 519	/* Make the appropriate header */
 520	hfi1_make_ud_req_tbl[priv->hdr_type](qp, ps, qp->s_wqe);
 521	priv->s_sde = qp_to_sdma_engine(qp, priv->s_sc);
 522	ps->s_txreq->sde = priv->s_sde;
 523	priv->s_sendcontext = qp_to_send_context(qp, priv->s_sc);
 524	ps->s_txreq->psc = priv->s_sendcontext;
 525	/* disarm any ahg */
 526	priv->s_ahg->ahgcount = 0;
 527	priv->s_ahg->ahgidx = 0;
 528	priv->s_ahg->tx_flags = 0;
 529
 530	return 1;
 531
 532done_free_tx:
 533	hfi1_put_txreq(ps->s_txreq);
 534	ps->s_txreq = NULL;
 535	return 1;
 536
 537bail:
 538	hfi1_put_txreq(ps->s_txreq);
 539
 540bail_no_tx:
 541	ps->s_txreq = NULL;
 542	qp->s_flags &= ~RVT_S_BUSY;
 543	return 0;
 544}
 545
 546/*
 547 * Hardware can't check this so we do it here.
 548 *
 549 * This is a slightly different algorithm than the standard pkey check.  It
 550 * special cases the management keys and allows for 0x7fff and 0xffff to be in
 551 * the table at the same time.
 552 *
 553 * @returns the index found or -1 if not found
 554 */
 555int hfi1_lookup_pkey_idx(struct hfi1_ibport *ibp, u16 pkey)
 556{
 557	struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 558	unsigned i;
 559
 560	if (pkey == FULL_MGMT_P_KEY || pkey == LIM_MGMT_P_KEY) {
 561		unsigned lim_idx = -1;
 562
 563		for (i = 0; i < ARRAY_SIZE(ppd->pkeys); ++i) {
 564			/* here we look for an exact match */
 565			if (ppd->pkeys[i] == pkey)
 566				return i;
 567			if (ppd->pkeys[i] == LIM_MGMT_P_KEY)
 568				lim_idx = i;
 569		}
 570
 571		/* did not find 0xffff return 0x7fff idx if found */
 572		if (pkey == FULL_MGMT_P_KEY)
 573			return lim_idx;
 574
 575		/* no match...  */
 576		return -1;
 577	}
 578
 579	pkey &= 0x7fff; /* remove limited/full membership bit */
 580
 581	for (i = 0; i < ARRAY_SIZE(ppd->pkeys); ++i)
 582		if ((ppd->pkeys[i] & 0x7fff) == pkey)
 583			return i;
 584
 585	/*
 586	 * Should not get here, this means hardware failed to validate pkeys.
 587	 */
 588	return -1;
 589}
 590
 591void return_cnp_16B(struct hfi1_ibport *ibp, struct rvt_qp *qp,
 592		    u32 remote_qpn, u16 pkey, u32 slid, u32 dlid,
 593		    u8 sc5, const struct ib_grh *old_grh)
 594{
 595	u64 pbc, pbc_flags = 0;
 596	u32 bth0, plen, vl, hwords = 7;
 597	u16 len;
 598	u8 l4;
 599	struct hfi1_opa_header hdr;
 600	struct ib_other_headers *ohdr;
 601	struct pio_buf *pbuf;
 602	struct send_context *ctxt = qp_to_send_context(qp, sc5);
 603	struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 604	u32 nwords;
 605
 606	hdr.hdr_type = HFI1_PKT_TYPE_16B;
 607	/* Populate length */
 608	nwords = ((hfi1_get_16b_padding(hwords << 2, 0) +
 609		   SIZE_OF_LT) >> 2) + SIZE_OF_CRC;
 610	if (old_grh) {
 611		struct ib_grh *grh = &hdr.opah.u.l.grh;
 612
 613		grh->version_tclass_flow = old_grh->version_tclass_flow;
 614		grh->paylen = cpu_to_be16(
 615			(hwords - LRH_16B_DWORDS + nwords) << 2);
 616		grh->hop_limit = 0xff;
 617		grh->sgid = old_grh->dgid;
 618		grh->dgid = old_grh->sgid;
 619		ohdr = &hdr.opah.u.l.oth;
 620		l4 = OPA_16B_L4_IB_GLOBAL;
 621		hwords += sizeof(struct ib_grh) / sizeof(u32);
 622	} else {
 623		ohdr = &hdr.opah.u.oth;
 624		l4 = OPA_16B_L4_IB_LOCAL;
 625	}
 626
 627	/* BIT 16 to 19 is TVER. Bit 20 to 22 is pad cnt */
 628	bth0 = (IB_OPCODE_CNP << 24) | (1 << 16) |
 629	       (hfi1_get_16b_padding(hwords << 2, 0) << 20);
 630	ohdr->bth[0] = cpu_to_be32(bth0);
 631
 632	ohdr->bth[1] = cpu_to_be32(remote_qpn);
 633	ohdr->bth[2] = 0; /* PSN 0 */
 634
 635	/* Convert dwords to flits */
 636	len = (hwords + nwords) >> 1;
 637	hfi1_make_16b_hdr(&hdr.opah, slid, dlid, len, pkey, 1, 0, l4, sc5);
 638
 639	plen = 2 /* PBC */ + hwords + nwords;
 640	pbc_flags |= PBC_PACKET_BYPASS | PBC_INSERT_BYPASS_ICRC;
 641	vl = sc_to_vlt(ppd->dd, sc5);
 642	pbc = create_pbc(ppd, pbc_flags, qp->srate_mbps, vl, plen);
 643	if (ctxt) {
 644		pbuf = sc_buffer_alloc(ctxt, plen, NULL, NULL);
 645		if (!IS_ERR_OR_NULL(pbuf)) {
 646			trace_pio_output_ibhdr(ppd->dd, &hdr, sc5);
 647			ppd->dd->pio_inline_send(ppd->dd, pbuf, pbc,
 648						 &hdr, hwords);
 649		}
 650	}
 651}
 652
 653void return_cnp(struct hfi1_ibport *ibp, struct rvt_qp *qp, u32 remote_qpn,
 654		u16 pkey, u32 slid, u32 dlid, u8 sc5,
 655		const struct ib_grh *old_grh)
 656{
 657	u64 pbc, pbc_flags = 0;
 658	u32 bth0, plen, vl, hwords = 5;
 659	u16 lrh0;
 660	u8 sl = ibp->sc_to_sl[sc5];
 661	struct hfi1_opa_header hdr;
 662	struct ib_other_headers *ohdr;
 663	struct pio_buf *pbuf;
 664	struct send_context *ctxt = qp_to_send_context(qp, sc5);
 665	struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 666
 667	hdr.hdr_type = HFI1_PKT_TYPE_9B;
 668	if (old_grh) {
 669		struct ib_grh *grh = &hdr.ibh.u.l.grh;
 670
 671		grh->version_tclass_flow = old_grh->version_tclass_flow;
 672		grh->paylen = cpu_to_be16(
 673			(hwords - LRH_9B_DWORDS + SIZE_OF_CRC) << 2);
 674		grh->hop_limit = 0xff;
 675		grh->sgid = old_grh->dgid;
 676		grh->dgid = old_grh->sgid;
 677		ohdr = &hdr.ibh.u.l.oth;
 678		lrh0 = HFI1_LRH_GRH;
 679		hwords += sizeof(struct ib_grh) / sizeof(u32);
 680	} else {
 681		ohdr = &hdr.ibh.u.oth;
 682		lrh0 = HFI1_LRH_BTH;
 683	}
 684
 685	lrh0 |= (sc5 & 0xf) << 12 | sl << 4;
 686
 687	bth0 = pkey | (IB_OPCODE_CNP << 24);
 688	ohdr->bth[0] = cpu_to_be32(bth0);
 689
 690	ohdr->bth[1] = cpu_to_be32(remote_qpn | (1 << IB_BECN_SHIFT));
 691	ohdr->bth[2] = 0; /* PSN 0 */
 692
 693	hfi1_make_ib_hdr(&hdr.ibh, lrh0, hwords + SIZE_OF_CRC, dlid, slid);
 694	plen = 2 /* PBC */ + hwords;
 695	pbc_flags |= (ib_is_sc5(sc5) << PBC_DC_INFO_SHIFT);
 696	vl = sc_to_vlt(ppd->dd, sc5);
 697	pbc = create_pbc(ppd, pbc_flags, qp->srate_mbps, vl, plen);
 698	if (ctxt) {
 699		pbuf = sc_buffer_alloc(ctxt, plen, NULL, NULL);
 700		if (!IS_ERR_OR_NULL(pbuf)) {
 701			trace_pio_output_ibhdr(ppd->dd, &hdr, sc5);
 702			ppd->dd->pio_inline_send(ppd->dd, pbuf, pbc,
 703						 &hdr, hwords);
 704		}
 705	}
 706}
 707
 708/*
 709 * opa_smp_check() - Do the regular pkey checking, and the additional
 710 * checks for SMPs specified in OPAv1 rev 1.0, 9/19/2016 update, section
 711 * 9.10.25 ("SMA Packet Checks").
 712 *
 713 * Note that:
 714 *   - Checks are done using the pkey directly from the packet's BTH,
 715 *     and specifically _not_ the pkey that we attach to the completion,
 716 *     which may be different.
 717 *   - These checks are specifically for "non-local" SMPs (i.e., SMPs
 718 *     which originated on another node). SMPs which are sent from, and
 719 *     destined to this node are checked in opa_local_smp_check().
 720 *
 721 * At the point where opa_smp_check() is called, we know:
 722 *   - destination QP is QP0
 723 *
 724 * opa_smp_check() returns 0 if all checks succeed, 1 otherwise.
 725 */
 726static int opa_smp_check(struct hfi1_ibport *ibp, u16 pkey, u8 sc5,
 727			 struct rvt_qp *qp, u16 slid, struct opa_smp *smp)
 728{
 729	struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 730
 731	/*
 732	 * I don't think it's possible for us to get here with sc != 0xf,
 733	 * but check it to be certain.
 734	 */
 735	if (sc5 != 0xf)
 736		return 1;
 737
 738	if (rcv_pkey_check(ppd, pkey, sc5, slid))
 739		return 1;
 740
 741	/*
 742	 * At this point we know (and so don't need to check again) that
 743	 * the pkey is either LIM_MGMT_P_KEY, or FULL_MGMT_P_KEY
 744	 * (see ingress_pkey_check).
 745	 */
 746	if (smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE &&
 747	    smp->mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED) {
 748		ingress_pkey_table_fail(ppd, pkey, slid);
 749		return 1;
 750	}
 751
 752	/*
 753	 * SMPs fall into one of four (disjoint) categories:
 754	 * SMA request, SMA response, SMA trap, or SMA trap repress.
 755	 * Our response depends, in part, on which type of SMP we're
 756	 * processing.
 757	 *
 758	 * If this is an SMA response, skip the check here.
 759	 *
 760	 * If this is an SMA request or SMA trap repress:
 761	 *   - pkey != FULL_MGMT_P_KEY =>
 762	 *       increment port recv constraint errors, drop MAD
 763	 *
 764	 * Otherwise:
 765	 *    - accept if the port is running an SM
 766	 *    - drop MAD if it's an SMA trap
 767	 *    - pkey == FULL_MGMT_P_KEY =>
 768	 *        reply with unsupported method
 769	 *    - pkey != FULL_MGMT_P_KEY =>
 770	 *	  increment port recv constraint errors, drop MAD
 771	 */
 772	switch (smp->method) {
 773	case IB_MGMT_METHOD_GET_RESP:
 774	case IB_MGMT_METHOD_REPORT_RESP:
 775		break;
 776	case IB_MGMT_METHOD_GET:
 777	case IB_MGMT_METHOD_SET:
 778	case IB_MGMT_METHOD_REPORT:
 779	case IB_MGMT_METHOD_TRAP_REPRESS:
 780		if (pkey != FULL_MGMT_P_KEY) {
 781			ingress_pkey_table_fail(ppd, pkey, slid);
 782			return 1;
 783		}
 784		break;
 785	default:
 786		if (ibp->rvp.port_cap_flags & IB_PORT_SM)
 787			return 0;
 788		if (smp->method == IB_MGMT_METHOD_TRAP)
 789			return 1;
 790		if (pkey == FULL_MGMT_P_KEY) {
 791			smp->status |= IB_SMP_UNSUP_METHOD;
 792			return 0;
 793		}
 794		ingress_pkey_table_fail(ppd, pkey, slid);
 795		return 1;
 796	}
 797	return 0;
 798}
 799
 800/**
 801 * hfi1_ud_rcv - receive an incoming UD packet
 802 * @packet: the packet structure
 803 *
 804 * This is called from qp_rcv() to process an incoming UD packet
 805 * for the given QP.
 806 * Called at interrupt level.
 807 */
 808void hfi1_ud_rcv(struct hfi1_packet *packet)
 809{
 810	u32 hdrsize = packet->hlen;
 811	struct ib_wc wc;
 812	u32 src_qp;
 813	u16 pkey;
 814	int mgmt_pkey_idx = -1;
 815	struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd);
 816	struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
 817	void *data = packet->payload;
 818	u32 tlen = packet->tlen;
 819	struct rvt_qp *qp = packet->qp;
 820	u8 sc5 = packet->sc;
 821	u8 sl_from_sc;
 822	u8 opcode = packet->opcode;
 823	u8 sl = packet->sl;
 824	u32 dlid = packet->dlid;
 825	u32 slid = packet->slid;
 826	u8 extra_bytes;
 827	u8 l4 = 0;
 828	bool dlid_is_permissive;
 829	bool slid_is_permissive;
 830	bool solicited = false;
 831
 832	extra_bytes = packet->pad + packet->extra_byte + (SIZE_OF_CRC << 2);
 833
 834	if (packet->etype == RHF_RCV_TYPE_BYPASS) {
 835		u32 permissive_lid =
 836			opa_get_lid(be32_to_cpu(OPA_LID_PERMISSIVE), 16B);
 837
 838		l4 = hfi1_16B_get_l4(packet->hdr);
 839		pkey = hfi1_16B_get_pkey(packet->hdr);
 840		dlid_is_permissive = (dlid == permissive_lid);
 841		slid_is_permissive = (slid == permissive_lid);
 842	} else {
 843		pkey = ib_bth_get_pkey(packet->ohdr);
 844		dlid_is_permissive = (dlid == be16_to_cpu(IB_LID_PERMISSIVE));
 845		slid_is_permissive = (slid == be16_to_cpu(IB_LID_PERMISSIVE));
 846	}
 847	sl_from_sc = ibp->sc_to_sl[sc5];
 848
 849	if (likely(l4 != OPA_16B_L4_FM)) {
 850		src_qp = ib_get_sqpn(packet->ohdr);
 851		solicited = ib_bth_is_solicited(packet->ohdr);
 852	} else {
 853		src_qp = hfi1_16B_get_src_qpn(packet->mgmt);
 854	}
 855
 856	process_ecn(qp, packet);
 857	/*
 858	 * Get the number of bytes the message was padded by
 859	 * and drop incomplete packets.
 860	 */
 861	if (unlikely(tlen < (hdrsize + extra_bytes)))
 862		goto drop;
 863
 864	tlen -= hdrsize + extra_bytes;
 865
 866	/*
 867	 * Check that the permissive LID is only used on QP0
 868	 * and the QKEY matches (see 9.6.1.4.1 and 9.6.1.5.1).
 869	 */
 870	if (qp->ibqp.qp_num) {
 871		if (unlikely(dlid_is_permissive || slid_is_permissive))
 872			goto drop;
 873		if (qp->ibqp.qp_num > 1) {
 874			if (unlikely(rcv_pkey_check(ppd, pkey, sc5, slid))) {
 875				/*
 876				 * Traps will not be sent for packets dropped
 877				 * by the HW. This is fine, as sending trap
 878				 * for invalid pkeys is optional according to
 879				 * IB spec (release 1.3, section 10.9.4)
 880				 */
 881				hfi1_bad_pkey(ibp,
 882					      pkey, sl,
 883					      src_qp, qp->ibqp.qp_num,
 884					      slid, dlid);
 885				return;
 886			}
 887		} else {
 888			/* GSI packet */
 889			mgmt_pkey_idx = hfi1_lookup_pkey_idx(ibp, pkey);
 890			if (mgmt_pkey_idx < 0)
 891				goto drop;
 892		}
 893		if (unlikely(l4 != OPA_16B_L4_FM &&
 894			     ib_get_qkey(packet->ohdr) != qp->qkey))
 895			return; /* Silent drop */
 896
 897		/* Drop invalid MAD packets (see 13.5.3.1). */
 898		if (unlikely(qp->ibqp.qp_num == 1 &&
 899			     (tlen > 2048 || (sc5 == 0xF))))
 900			goto drop;
 901	} else {
 902		/* Received on QP0, and so by definition, this is an SMP */
 903		struct opa_smp *smp = (struct opa_smp *)data;
 904
 905		if (opa_smp_check(ibp, pkey, sc5, qp, slid, smp))
 906			goto drop;
 907
 908		if (tlen > 2048)
 909			goto drop;
 910		if ((dlid_is_permissive || slid_is_permissive) &&
 911		    smp->mgmt_class != IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
 912			goto drop;
 913
 914		/* look up SMI pkey */
 915		mgmt_pkey_idx = hfi1_lookup_pkey_idx(ibp, pkey);
 916		if (mgmt_pkey_idx < 0)
 917			goto drop;
 918	}
 919
 920	if (qp->ibqp.qp_num > 1 &&
 921	    opcode == IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE) {
 922		wc.ex.imm_data = packet->ohdr->u.ud.imm_data;
 923		wc.wc_flags = IB_WC_WITH_IMM;
 924	} else if (opcode == IB_OPCODE_UD_SEND_ONLY) {
 925		wc.ex.imm_data = 0;
 926		wc.wc_flags = 0;
 927	} else {
 928		goto drop;
 929	}
 930
 931	/*
 932	 * A GRH is expected to precede the data even if not
 933	 * present on the wire.
 934	 */
 935	wc.byte_len = tlen + sizeof(struct ib_grh);
 936
 937	/*
 938	 * Get the next work request entry to find where to put the data.
 939	 */
 940	if (qp->r_flags & RVT_R_REUSE_SGE) {
 941		qp->r_flags &= ~RVT_R_REUSE_SGE;
 942	} else {
 943		int ret;
 944
 945		ret = rvt_get_rwqe(qp, false);
 946		if (ret < 0) {
 947			rvt_rc_error(qp, IB_WC_LOC_QP_OP_ERR);
 948			return;
 949		}
 950		if (!ret) {
 951			if (qp->ibqp.qp_num == 0)
 952				ibp->rvp.n_vl15_dropped++;
 953			return;
 954		}
 955	}
 956	/* Silently drop packets which are too big. */
 957	if (unlikely(wc.byte_len > qp->r_len)) {
 958		qp->r_flags |= RVT_R_REUSE_SGE;
 959		goto drop;
 960	}
 961	if (packet->grh) {
 962		rvt_copy_sge(qp, &qp->r_sge, packet->grh,
 963			     sizeof(struct ib_grh), true, false);
 964		wc.wc_flags |= IB_WC_GRH;
 965	} else if (packet->etype == RHF_RCV_TYPE_BYPASS) {
 966		struct ib_grh grh;
 967		/*
 968		 * Assuming we only created 16B on the send side
 969		 * if we want to use large LIDs, since GRH was stripped
 970		 * out when creating 16B, add back the GRH here.
 971		 */
 972		hfi1_make_ext_grh(packet, &grh, slid, dlid);
 973		rvt_copy_sge(qp, &qp->r_sge, &grh,
 974			     sizeof(struct ib_grh), true, false);
 975		wc.wc_flags |= IB_WC_GRH;
 976	} else {
 977		rvt_skip_sge(&qp->r_sge, sizeof(struct ib_grh), true);
 978	}
 979	rvt_copy_sge(qp, &qp->r_sge, data, wc.byte_len - sizeof(struct ib_grh),
 980		     true, false);
 981	rvt_put_ss(&qp->r_sge);
 982	if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags))
 983		return;
 984	wc.wr_id = qp->r_wr_id;
 985	wc.status = IB_WC_SUCCESS;
 986	wc.opcode = IB_WC_RECV;
 987	wc.vendor_err = 0;
 988	wc.qp = &qp->ibqp;
 989	wc.src_qp = src_qp;
 990
 991	if (qp->ibqp.qp_type == IB_QPT_GSI ||
 992	    qp->ibqp.qp_type == IB_QPT_SMI) {
 993		if (mgmt_pkey_idx < 0) {
 994			if (net_ratelimit()) {
 995				struct hfi1_devdata *dd = ppd->dd;
 996
 997				dd_dev_err(dd, "QP type %d mgmt_pkey_idx < 0 and packet not dropped???\n",
 998					   qp->ibqp.qp_type);
 999				mgmt_pkey_idx = 0;
1000			}
1001		}
1002		wc.pkey_index = (unsigned)mgmt_pkey_idx;
1003	} else {
1004		wc.pkey_index = 0;
1005	}
1006	if (slid_is_permissive)
1007		slid = be32_to_cpu(OPA_LID_PERMISSIVE);
1008	wc.slid = slid & U16_MAX;
1009	wc.sl = sl_from_sc;
1010
1011	/*
1012	 * Save the LMC lower bits if the destination LID is a unicast LID.
1013	 */
1014	wc.dlid_path_bits = hfi1_check_mcast(dlid) ? 0 :
1015		dlid & ((1 << ppd_from_ibp(ibp)->lmc) - 1);
1016	wc.port_num = qp->port_num;
1017	/* Signal completion event if the solicited bit is set. */
1018	rvt_recv_cq(qp, &wc, solicited);
1019	return;
1020
1021drop:
1022	ibp->rvp.n_pkt_drops++;
1023}