Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1905 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/hfi1/driver.c b/drivers/infiniband/hw/hfi1/driver.c
new file mode 100644
index 000000000..8e71bef9d
--- /dev/null
+++ b/drivers/infiniband/hw/hfi1/driver.c
@@ -0,0 +1,1905 @@
+// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
+/*
+ * Copyright(c) 2015-2020 Intel Corporation.
+ * Copyright(c) 2021 Cornelis Networks.
+ */
+
+#include <linux/spinlock.h>
+#include <linux/pci.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/vmalloc.h>
+#include <linux/module.h>
+#include <linux/prefetch.h>
+#include <rdma/ib_verbs.h>
+#include <linux/etherdevice.h>
+
+#include "hfi.h"
+#include "trace.h"
+#include "qp.h"
+#include "sdma.h"
+#include "debugfs.h"
+#include "vnic.h"
+#include "fault.h"
+
+#include "ipoib.h"
+#include "netdev.h"
+
+#undef pr_fmt
+#define pr_fmt(fmt) DRIVER_NAME ": " fmt
+
+DEFINE_MUTEX(hfi1_mutex);	/* general driver use */
+
+unsigned int hfi1_max_mtu = HFI1_DEFAULT_MAX_MTU;
+module_param_named(max_mtu, hfi1_max_mtu, uint, S_IRUGO);
+MODULE_PARM_DESC(max_mtu, "Set max MTU bytes, default is " __stringify(
+		 HFI1_DEFAULT_MAX_MTU));
+
+unsigned int hfi1_cu = 1;
+module_param_named(cu, hfi1_cu, uint, S_IRUGO);
+MODULE_PARM_DESC(cu, "Credit return units");
+
+unsigned long hfi1_cap_mask = HFI1_CAP_MASK_DEFAULT;
+static int hfi1_caps_set(const char *val, const struct kernel_param *kp);
+static int hfi1_caps_get(char *buffer, const struct kernel_param *kp);
+static const struct kernel_param_ops cap_ops = {
+	.set = hfi1_caps_set,
+	.get = hfi1_caps_get
+};
+module_param_cb(cap_mask, &cap_ops, &hfi1_cap_mask, S_IWUSR | S_IRUGO);
+MODULE_PARM_DESC(cap_mask, "Bit mask of enabled/disabled HW features");
+
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_DESCRIPTION("Cornelis Omni-Path Express driver");
+
+/*
+ * MAX_PKT_RCV is the max # if packets processed per receive interrupt.
+ */
+#define MAX_PKT_RECV 64
+/*
+ * MAX_PKT_THREAD_RCV is the max # of packets processed before
+ * the qp_wait_list queue is flushed.
+ */
+#define MAX_PKT_RECV_THREAD (MAX_PKT_RECV * 4)
+#define EGR_HEAD_UPDATE_THRESHOLD 16
+
+struct hfi1_ib_stats hfi1_stats;
+
+static int hfi1_caps_set(const char *val, const struct kernel_param *kp)
+{
+	int ret = 0;
+	unsigned long *cap_mask_ptr = (unsigned long *)kp->arg,
+		cap_mask = *cap_mask_ptr, value, diff,
+		write_mask = ((HFI1_CAP_WRITABLE_MASK << HFI1_CAP_USER_SHIFT) |
+			      HFI1_CAP_WRITABLE_MASK);
+
+	ret = kstrtoul(val, 0, &value);
+	if (ret) {
+		pr_warn("Invalid module parameter value for 'cap_mask'\n");
+		goto done;
+	}
+	/* Get the changed bits (except the locked bit) */
+	diff = value ^ (cap_mask & ~HFI1_CAP_LOCKED_SMASK);
+
+	/* Remove any bits that are not allowed to change after driver load */
+	if (HFI1_CAP_LOCKED() && (diff & ~write_mask)) {
+		pr_warn("Ignoring non-writable capability bits %#lx\n",
+			diff & ~write_mask);
+		diff &= write_mask;
+	}
+
+	/* Mask off any reserved bits */
+	diff &= ~HFI1_CAP_RESERVED_MASK;
+	/* Clear any previously set and changing bits */
+	cap_mask &= ~diff;
+	/* Update the bits with the new capability */
+	cap_mask |= (value & diff);
+	/* Check for any kernel/user restrictions */
+	diff = (cap_mask & (HFI1_CAP_MUST_HAVE_KERN << HFI1_CAP_USER_SHIFT)) ^
+		((cap_mask & HFI1_CAP_MUST_HAVE_KERN) << HFI1_CAP_USER_SHIFT);
+	cap_mask &= ~diff;
+	/* Set the bitmask to the final set */
+	*cap_mask_ptr = cap_mask;
+done:
+	return ret;
+}
+
+static int hfi1_caps_get(char *buffer, const struct kernel_param *kp)
+{
+	unsigned long cap_mask = *(unsigned long *)kp->arg;
+
+	cap_mask &= ~HFI1_CAP_LOCKED_SMASK;
+	cap_mask |= ((cap_mask & HFI1_CAP_K2U) << HFI1_CAP_USER_SHIFT);
+
+	return scnprintf(buffer, PAGE_SIZE, "0x%lx", cap_mask);
+}
+
+struct pci_dev *get_pci_dev(struct rvt_dev_info *rdi)
+{
+	struct hfi1_ibdev *ibdev = container_of(rdi, struct hfi1_ibdev, rdi);
+	struct hfi1_devdata *dd = container_of(ibdev,
+					       struct hfi1_devdata, verbs_dev);
+	return dd->pcidev;
+}
+
+/*
+ * Return count of units with at least one port ACTIVE.
+ */
+int hfi1_count_active_units(void)
+{
+	struct hfi1_devdata *dd;
+	struct hfi1_pportdata *ppd;
+	unsigned long index, flags;
+	int pidx, nunits_active = 0;
+
+	xa_lock_irqsave(&hfi1_dev_table, flags);
+	xa_for_each(&hfi1_dev_table, index, dd) {
+		if (!(dd->flags & HFI1_PRESENT) || !dd->kregbase1)
+			continue;
+		for (pidx = 0; pidx < dd->num_pports; ++pidx) {
+			ppd = dd->pport + pidx;
+			if (ppd->lid && ppd->linkup) {
+				nunits_active++;
+				break;
+			}
+		}
+	}
+	xa_unlock_irqrestore(&hfi1_dev_table, flags);
+	return nunits_active;
+}
+
+/*
+ * Get address of eager buffer from it's index (allocated in chunks, not
+ * contiguous).
+ */
+static inline void *get_egrbuf(const struct hfi1_ctxtdata *rcd, u64 rhf,
+			       u8 *update)
+{
+	u32 idx = rhf_egr_index(rhf), offset = rhf_egr_buf_offset(rhf);
+
+	*update |= !(idx & (rcd->egrbufs.threshold - 1)) && !offset;
+	return (void *)(((u64)(rcd->egrbufs.rcvtids[idx].addr)) +
+			(offset * RCV_BUF_BLOCK_SIZE));
+}
+
+static inline void *hfi1_get_header(struct hfi1_ctxtdata *rcd,
+				    __le32 *rhf_addr)
+{
+	u32 offset = rhf_hdrq_offset(rhf_to_cpu(rhf_addr));
+
+	return (void *)(rhf_addr - rcd->rhf_offset + offset);
+}
+
+static inline struct ib_header *hfi1_get_msgheader(struct hfi1_ctxtdata *rcd,
+						   __le32 *rhf_addr)
+{
+	return (struct ib_header *)hfi1_get_header(rcd, rhf_addr);
+}
+
+static inline struct hfi1_16b_header
+		*hfi1_get_16B_header(struct hfi1_ctxtdata *rcd,
+				     __le32 *rhf_addr)
+{
+	return (struct hfi1_16b_header *)hfi1_get_header(rcd, rhf_addr);
+}
+
+/*
+ * Validate and encode the a given RcvArray Buffer size.
+ * The function will check whether the given size falls within
+ * allowed size ranges for the respective type and, optionally,
+ * return the proper encoding.
+ */
+int hfi1_rcvbuf_validate(u32 size, u8 type, u16 *encoded)
+{
+	if (unlikely(!PAGE_ALIGNED(size)))
+		return 0;
+	if (unlikely(size < MIN_EAGER_BUFFER))
+		return 0;
+	if (size >
+	    (type == PT_EAGER ? MAX_EAGER_BUFFER : MAX_EXPECTED_BUFFER))
+		return 0;
+	if (encoded)
+		*encoded = ilog2(size / PAGE_SIZE) + 1;
+	return 1;
+}
+
+static void rcv_hdrerr(struct hfi1_ctxtdata *rcd, struct hfi1_pportdata *ppd,
+		       struct hfi1_packet *packet)
+{
+	struct ib_header *rhdr = packet->hdr;
+	u32 rte = rhf_rcv_type_err(packet->rhf);
+	u32 mlid_base;
+	struct hfi1_ibport *ibp = rcd_to_iport(rcd);
+	struct hfi1_devdata *dd = ppd->dd;
+	struct hfi1_ibdev *verbs_dev = &dd->verbs_dev;
+	struct rvt_dev_info *rdi = &verbs_dev->rdi;
+
+	if ((packet->rhf & RHF_DC_ERR) &&
+	    hfi1_dbg_fault_suppress_err(verbs_dev))
+		return;
+
+	if (packet->rhf & RHF_ICRC_ERR)
+		return;
+
+	if (packet->etype == RHF_RCV_TYPE_BYPASS) {
+		goto drop;
+	} else {
+		u8 lnh = ib_get_lnh(rhdr);
+
+		mlid_base = be16_to_cpu(IB_MULTICAST_LID_BASE);
+		if (lnh == HFI1_LRH_BTH) {
+			packet->ohdr = &rhdr->u.oth;
+		} else if (lnh == HFI1_LRH_GRH) {
+			packet->ohdr = &rhdr->u.l.oth;
+			packet->grh = &rhdr->u.l.grh;
+		} else {
+			goto drop;
+		}
+	}
+
+	if (packet->rhf & RHF_TID_ERR) {
+		/* For TIDERR and RC QPs preemptively schedule a NAK */
+		u32 tlen = rhf_pkt_len(packet->rhf); /* in bytes */
+		u32 dlid = ib_get_dlid(rhdr);
+		u32 qp_num;
+
+		/* Sanity check packet */
+		if (tlen < 24)
+			goto drop;
+
+		/* Check for GRH */
+		if (packet->grh) {
+			u32 vtf;
+			struct ib_grh *grh = packet->grh;
+
+			if (grh->next_hdr != IB_GRH_NEXT_HDR)
+				goto drop;
+			vtf = be32_to_cpu(grh->version_tclass_flow);
+			if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION)
+				goto drop;
+		}
+
+		/* Get the destination QP number. */
+		qp_num = ib_bth_get_qpn(packet->ohdr);
+		if (dlid < mlid_base) {
+			struct rvt_qp *qp;
+			unsigned long flags;
+
+			rcu_read_lock();
+			qp = rvt_lookup_qpn(rdi, &ibp->rvp, qp_num);
+			if (!qp) {
+				rcu_read_unlock();
+				goto drop;
+			}
+
+			/*
+			 * Handle only RC QPs - for other QP types drop error
+			 * packet.
+			 */
+			spin_lock_irqsave(&qp->r_lock, flags);
+
+			/* Check for valid receive state. */
+			if (!(ib_rvt_state_ops[qp->state] &
+			      RVT_PROCESS_RECV_OK)) {
+				ibp->rvp.n_pkt_drops++;
+			}
+
+			switch (qp->ibqp.qp_type) {
+			case IB_QPT_RC:
+				hfi1_rc_hdrerr(rcd, packet, qp);
+				break;
+			default:
+				/* For now don't handle any other QP types */
+				break;
+			}
+
+			spin_unlock_irqrestore(&qp->r_lock, flags);
+			rcu_read_unlock();
+		} /* Unicast QP */
+	} /* Valid packet with TIDErr */
+
+	/* handle "RcvTypeErr" flags */
+	switch (rte) {
+	case RHF_RTE_ERROR_OP_CODE_ERR:
+	{
+		void *ebuf = NULL;
+		u8 opcode;
+
+		if (rhf_use_egr_bfr(packet->rhf))
+			ebuf = packet->ebuf;
+
+		if (!ebuf)
+			goto drop; /* this should never happen */
+
+		opcode = ib_bth_get_opcode(packet->ohdr);
+		if (opcode == IB_OPCODE_CNP) {
+			/*
+			 * Only in pre-B0 h/w is the CNP_OPCODE handled
+			 * via this code path.
+			 */
+			struct rvt_qp *qp = NULL;
+			u32 lqpn, rqpn;
+			u16 rlid;
+			u8 svc_type, sl, sc5;
+
+			sc5 = hfi1_9B_get_sc5(rhdr, packet->rhf);
+			sl = ibp->sc_to_sl[sc5];
+
+			lqpn = ib_bth_get_qpn(packet->ohdr);
+			rcu_read_lock();
+			qp = rvt_lookup_qpn(rdi, &ibp->rvp, lqpn);
+			if (!qp) {
+				rcu_read_unlock();
+				goto drop;
+			}
+
+			switch (qp->ibqp.qp_type) {
+			case IB_QPT_UD:
+				rlid = 0;
+				rqpn = 0;
+				svc_type = IB_CC_SVCTYPE_UD;
+				break;
+			case IB_QPT_UC:
+				rlid = ib_get_slid(rhdr);
+				rqpn = qp->remote_qpn;
+				svc_type = IB_CC_SVCTYPE_UC;
+				break;
+			default:
+				rcu_read_unlock();
+				goto drop;
+			}
+
+			process_becn(ppd, sl, rlid, lqpn, rqpn, svc_type);
+			rcu_read_unlock();
+		}
+
+		packet->rhf &= ~RHF_RCV_TYPE_ERR_SMASK;
+		break;
+	}
+	default:
+		break;
+	}
+
+drop:
+	return;
+}
+
+static inline void init_packet(struct hfi1_ctxtdata *rcd,
+			       struct hfi1_packet *packet)
+{
+	packet->rsize = get_hdrqentsize(rcd); /* words */
+	packet->maxcnt = get_hdrq_cnt(rcd) * packet->rsize; /* words */
+	packet->rcd = rcd;
+	packet->updegr = 0;
+	packet->etail = -1;
+	packet->rhf_addr = get_rhf_addr(rcd);
+	packet->rhf = rhf_to_cpu(packet->rhf_addr);
+	packet->rhqoff = hfi1_rcd_head(rcd);
+	packet->numpkt = 0;
+}
+
+/* We support only two types - 9B and 16B for now */
+static const hfi1_handle_cnp hfi1_handle_cnp_tbl[2] = {
+	[HFI1_PKT_TYPE_9B] = &return_cnp,
+	[HFI1_PKT_TYPE_16B] = &return_cnp_16B
+};
+
+/**
+ * hfi1_process_ecn_slowpath - Process FECN or BECN bits
+ * @qp: The packet's destination QP
+ * @pkt: The packet itself.
+ * @prescan: Is the caller the RXQ prescan
+ *
+ * Process the packet's FECN or BECN bits. By now, the packet
+ * has already been evaluated whether processing of those bit should
+ * be done.
+ * The significance of the @prescan argument is that if the caller
+ * is the RXQ prescan, a CNP will be send out instead of waiting for the
+ * normal packet processing to send an ACK with BECN set (or a CNP).
+ */
+bool hfi1_process_ecn_slowpath(struct rvt_qp *qp, struct hfi1_packet *pkt,
+			       bool prescan)
+{
+	struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
+	struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
+	struct ib_other_headers *ohdr = pkt->ohdr;
+	struct ib_grh *grh = pkt->grh;
+	u32 rqpn = 0;
+	u16 pkey;
+	u32 rlid, slid, dlid = 0;
+	u8 hdr_type, sc, svc_type, opcode;
+	bool is_mcast = false, ignore_fecn = false, do_cnp = false,
+		fecn, becn;
+
+	/* can be called from prescan */
+	if (pkt->etype == RHF_RCV_TYPE_BYPASS) {
+		pkey = hfi1_16B_get_pkey(pkt->hdr);
+		sc = hfi1_16B_get_sc(pkt->hdr);
+		dlid = hfi1_16B_get_dlid(pkt->hdr);
+		slid = hfi1_16B_get_slid(pkt->hdr);
+		is_mcast = hfi1_is_16B_mcast(dlid);
+		opcode = ib_bth_get_opcode(ohdr);
+		hdr_type = HFI1_PKT_TYPE_16B;
+		fecn = hfi1_16B_get_fecn(pkt->hdr);
+		becn = hfi1_16B_get_becn(pkt->hdr);
+	} else {
+		pkey = ib_bth_get_pkey(ohdr);
+		sc = hfi1_9B_get_sc5(pkt->hdr, pkt->rhf);
+		dlid = qp->ibqp.qp_type != IB_QPT_UD ? ib_get_dlid(pkt->hdr) :
+			ppd->lid;
+		slid = ib_get_slid(pkt->hdr);
+		is_mcast = (dlid > be16_to_cpu(IB_MULTICAST_LID_BASE)) &&
+			   (dlid != be16_to_cpu(IB_LID_PERMISSIVE));
+		opcode = ib_bth_get_opcode(ohdr);
+		hdr_type = HFI1_PKT_TYPE_9B;
+		fecn = ib_bth_get_fecn(ohdr);
+		becn = ib_bth_get_becn(ohdr);
+	}
+
+	switch (qp->ibqp.qp_type) {
+	case IB_QPT_UD:
+		rlid = slid;
+		rqpn = ib_get_sqpn(pkt->ohdr);
+		svc_type = IB_CC_SVCTYPE_UD;
+		break;
+	case IB_QPT_SMI:
+	case IB_QPT_GSI:
+		rlid = slid;
+		rqpn = ib_get_sqpn(pkt->ohdr);
+		svc_type = IB_CC_SVCTYPE_UD;
+		break;
+	case IB_QPT_UC:
+		rlid = rdma_ah_get_dlid(&qp->remote_ah_attr);
+		rqpn = qp->remote_qpn;
+		svc_type = IB_CC_SVCTYPE_UC;
+		break;
+	case IB_QPT_RC:
+		rlid = rdma_ah_get_dlid(&qp->remote_ah_attr);
+		rqpn = qp->remote_qpn;
+		svc_type = IB_CC_SVCTYPE_RC;
+		break;
+	default:
+		return false;
+	}
+
+	ignore_fecn = is_mcast || (opcode == IB_OPCODE_CNP) ||
+		(opcode == IB_OPCODE_RC_ACKNOWLEDGE);
+	/*
+	 * ACKNOWLEDGE packets do not get a CNP but this will be
+	 * guarded by ignore_fecn above.
+	 */
+	do_cnp = prescan ||
+		(opcode >= IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST &&
+		 opcode <= IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE) ||
+		opcode == TID_OP(READ_RESP) ||
+		opcode == TID_OP(ACK);
+
+	/* Call appropriate CNP handler */
+	if (!ignore_fecn && do_cnp && fecn)
+		hfi1_handle_cnp_tbl[hdr_type](ibp, qp, rqpn, pkey,
+					      dlid, rlid, sc, grh);
+
+	if (becn) {
+		u32 lqpn = be32_to_cpu(ohdr->bth[1]) & RVT_QPN_MASK;
+		u8 sl = ibp->sc_to_sl[sc];
+
+		process_becn(ppd, sl, rlid, lqpn, rqpn, svc_type);
+	}
+	return !ignore_fecn && fecn;
+}
+
+struct ps_mdata {
+	struct hfi1_ctxtdata *rcd;
+	u32 rsize;
+	u32 maxcnt;
+	u32 ps_head;
+	u32 ps_tail;
+	u32 ps_seq;
+};
+
+static inline void init_ps_mdata(struct ps_mdata *mdata,
+				 struct hfi1_packet *packet)
+{
+	struct hfi1_ctxtdata *rcd = packet->rcd;
+
+	mdata->rcd = rcd;
+	mdata->rsize = packet->rsize;
+	mdata->maxcnt = packet->maxcnt;
+	mdata->ps_head = packet->rhqoff;
+
+	if (get_dma_rtail_setting(rcd)) {
+		mdata->ps_tail = get_rcvhdrtail(rcd);
+		if (rcd->ctxt == HFI1_CTRL_CTXT)
+			mdata->ps_seq = hfi1_seq_cnt(rcd);
+		else
+			mdata->ps_seq = 0; /* not used with DMA_RTAIL */
+	} else {
+		mdata->ps_tail = 0; /* used only with DMA_RTAIL*/
+		mdata->ps_seq = hfi1_seq_cnt(rcd);
+	}
+}
+
+static inline int ps_done(struct ps_mdata *mdata, u64 rhf,
+			  struct hfi1_ctxtdata *rcd)
+{
+	if (get_dma_rtail_setting(rcd))
+		return mdata->ps_head == mdata->ps_tail;
+	return mdata->ps_seq != rhf_rcv_seq(rhf);
+}
+
+static inline int ps_skip(struct ps_mdata *mdata, u64 rhf,
+			  struct hfi1_ctxtdata *rcd)
+{
+	/*
+	 * Control context can potentially receive an invalid rhf.
+	 * Drop such packets.
+	 */
+	if ((rcd->ctxt == HFI1_CTRL_CTXT) && (mdata->ps_head != mdata->ps_tail))
+		return mdata->ps_seq != rhf_rcv_seq(rhf);
+
+	return 0;
+}
+
+static inline void update_ps_mdata(struct ps_mdata *mdata,
+				   struct hfi1_ctxtdata *rcd)
+{
+	mdata->ps_head += mdata->rsize;
+	if (mdata->ps_head >= mdata->maxcnt)
+		mdata->ps_head = 0;
+
+	/* Control context must do seq counting */
+	if (!get_dma_rtail_setting(rcd) ||
+	    rcd->ctxt == HFI1_CTRL_CTXT)
+		mdata->ps_seq = hfi1_seq_incr_wrap(mdata->ps_seq);
+}
+
+/*
+ * prescan_rxq - search through the receive queue looking for packets
+ * containing Excplicit Congestion Notifications (FECNs, or BECNs).
+ * When an ECN is found, process the Congestion Notification, and toggle
+ * it off.
+ * This is declared as a macro to allow quick checking of the port to avoid
+ * the overhead of a function call if not enabled.
+ */
+#define prescan_rxq(rcd, packet) \
+	do { \
+		if (rcd->ppd->cc_prescan) \
+			__prescan_rxq(packet); \
+	} while (0)
+static void __prescan_rxq(struct hfi1_packet *packet)
+{
+	struct hfi1_ctxtdata *rcd = packet->rcd;
+	struct ps_mdata mdata;
+
+	init_ps_mdata(&mdata, packet);
+
+	while (1) {
+		struct hfi1_ibport *ibp = rcd_to_iport(rcd);
+		__le32 *rhf_addr = (__le32 *)rcd->rcvhdrq + mdata.ps_head +
+					 packet->rcd->rhf_offset;
+		struct rvt_qp *qp;
+		struct ib_header *hdr;
+		struct rvt_dev_info *rdi = &rcd->dd->verbs_dev.rdi;
+		u64 rhf = rhf_to_cpu(rhf_addr);
+		u32 etype = rhf_rcv_type(rhf), qpn, bth1;
+		u8 lnh;
+
+		if (ps_done(&mdata, rhf, rcd))
+			break;
+
+		if (ps_skip(&mdata, rhf, rcd))
+			goto next;
+
+		if (etype != RHF_RCV_TYPE_IB)
+			goto next;
+
+		packet->hdr = hfi1_get_msgheader(packet->rcd, rhf_addr);
+		hdr = packet->hdr;
+		lnh = ib_get_lnh(hdr);
+
+		if (lnh == HFI1_LRH_BTH) {
+			packet->ohdr = &hdr->u.oth;
+			packet->grh = NULL;
+		} else if (lnh == HFI1_LRH_GRH) {
+			packet->ohdr = &hdr->u.l.oth;
+			packet->grh = &hdr->u.l.grh;
+		} else {
+			goto next; /* just in case */
+		}
+
+		if (!hfi1_may_ecn(packet))
+			goto next;
+
+		bth1 = be32_to_cpu(packet->ohdr->bth[1]);
+		qpn = bth1 & RVT_QPN_MASK;
+		rcu_read_lock();
+		qp = rvt_lookup_qpn(rdi, &ibp->rvp, qpn);
+
+		if (!qp) {
+			rcu_read_unlock();
+			goto next;
+		}
+
+		hfi1_process_ecn_slowpath(qp, packet, true);
+		rcu_read_unlock();
+
+		/* turn off BECN, FECN */
+		bth1 &= ~(IB_FECN_SMASK | IB_BECN_SMASK);
+		packet->ohdr->bth[1] = cpu_to_be32(bth1);
+next:
+		update_ps_mdata(&mdata, rcd);
+	}
+}
+
+static void process_rcv_qp_work(struct hfi1_packet *packet)
+{
+	struct rvt_qp *qp, *nqp;
+	struct hfi1_ctxtdata *rcd = packet->rcd;
+
+	/*
+	 * Iterate over all QPs waiting to respond.
+	 * The list won't change since the IRQ is only run on one CPU.
+	 */
+	list_for_each_entry_safe(qp, nqp, &rcd->qp_wait_list, rspwait) {
+		list_del_init(&qp->rspwait);
+		if (qp->r_flags & RVT_R_RSP_NAK) {
+			qp->r_flags &= ~RVT_R_RSP_NAK;
+			packet->qp = qp;
+			hfi1_send_rc_ack(packet, 0);
+		}
+		if (qp->r_flags & RVT_R_RSP_SEND) {
+			unsigned long flags;
+
+			qp->r_flags &= ~RVT_R_RSP_SEND;
+			spin_lock_irqsave(&qp->s_lock, flags);
+			if (ib_rvt_state_ops[qp->state] &
+					RVT_PROCESS_OR_FLUSH_SEND)
+				hfi1_schedule_send(qp);
+			spin_unlock_irqrestore(&qp->s_lock, flags);
+		}
+		rvt_put_qp(qp);
+	}
+}
+
+static noinline int max_packet_exceeded(struct hfi1_packet *packet, int thread)
+{
+	if (thread) {
+		if ((packet->numpkt & (MAX_PKT_RECV_THREAD - 1)) == 0)
+			/* allow defered processing */
+			process_rcv_qp_work(packet);
+		cond_resched();
+		return RCV_PKT_OK;
+	} else {
+		this_cpu_inc(*packet->rcd->dd->rcv_limit);
+		return RCV_PKT_LIMIT;
+	}
+}
+
+static inline int check_max_packet(struct hfi1_packet *packet, int thread)
+{
+	int ret = RCV_PKT_OK;
+
+	if (unlikely((packet->numpkt & (MAX_PKT_RECV - 1)) == 0))
+		ret = max_packet_exceeded(packet, thread);
+	return ret;
+}
+
+static noinline int skip_rcv_packet(struct hfi1_packet *packet, int thread)
+{
+	int ret;
+
+	packet->rcd->dd->ctx0_seq_drop++;
+	/* Set up for the next packet */
+	packet->rhqoff += packet->rsize;
+	if (packet->rhqoff >= packet->maxcnt)
+		packet->rhqoff = 0;
+
+	packet->numpkt++;
+	ret = check_max_packet(packet, thread);
+
+	packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff +
+				     packet->rcd->rhf_offset;
+	packet->rhf = rhf_to_cpu(packet->rhf_addr);
+
+	return ret;
+}
+
+static void process_rcv_packet_napi(struct hfi1_packet *packet)
+{
+	packet->etype = rhf_rcv_type(packet->rhf);
+
+	/* total length */
+	packet->tlen = rhf_pkt_len(packet->rhf); /* in bytes */
+	/* retrieve eager buffer details */
+	packet->etail = rhf_egr_index(packet->rhf);
+	packet->ebuf = get_egrbuf(packet->rcd, packet->rhf,
+				  &packet->updegr);
+	/*
+	 * Prefetch the contents of the eager buffer.  It is
+	 * OK to send a negative length to prefetch_range().
+	 * The +2 is the size of the RHF.
+	 */
+	prefetch_range(packet->ebuf,
+		       packet->tlen - ((packet->rcd->rcvhdrqentsize -
+				       (rhf_hdrq_offset(packet->rhf)
+					+ 2)) * 4));
+
+	packet->rcd->rhf_rcv_function_map[packet->etype](packet);
+	packet->numpkt++;
+
+	/* Set up for the next packet */
+	packet->rhqoff += packet->rsize;
+	if (packet->rhqoff >= packet->maxcnt)
+		packet->rhqoff = 0;
+
+	packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff +
+				      packet->rcd->rhf_offset;
+	packet->rhf = rhf_to_cpu(packet->rhf_addr);
+}
+
+static inline int process_rcv_packet(struct hfi1_packet *packet, int thread)
+{
+	int ret;
+
+	packet->etype = rhf_rcv_type(packet->rhf);
+
+	/* total length */
+	packet->tlen = rhf_pkt_len(packet->rhf); /* in bytes */
+	/* retrieve eager buffer details */
+	packet->ebuf = NULL;
+	if (rhf_use_egr_bfr(packet->rhf)) {
+		packet->etail = rhf_egr_index(packet->rhf);
+		packet->ebuf = get_egrbuf(packet->rcd, packet->rhf,
+				 &packet->updegr);
+		/*
+		 * Prefetch the contents of the eager buffer.  It is
+		 * OK to send a negative length to prefetch_range().
+		 * The +2 is the size of the RHF.
+		 */
+		prefetch_range(packet->ebuf,
+			       packet->tlen - ((get_hdrqentsize(packet->rcd) -
+					       (rhf_hdrq_offset(packet->rhf)
+						+ 2)) * 4));
+	}
+
+	/*
+	 * Call a type specific handler for the packet. We
+	 * should be able to trust that etype won't be beyond
+	 * the range of valid indexes. If so something is really
+	 * wrong and we can probably just let things come
+	 * crashing down. There is no need to eat another
+	 * comparison in this performance critical code.
+	 */
+	packet->rcd->rhf_rcv_function_map[packet->etype](packet);
+	packet->numpkt++;
+
+	/* Set up for the next packet */
+	packet->rhqoff += packet->rsize;
+	if (packet->rhqoff >= packet->maxcnt)
+		packet->rhqoff = 0;
+
+	ret = check_max_packet(packet, thread);
+
+	packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff +
+				      packet->rcd->rhf_offset;
+	packet->rhf = rhf_to_cpu(packet->rhf_addr);
+
+	return ret;
+}
+
+static inline void process_rcv_update(int last, struct hfi1_packet *packet)
+{
+	/*
+	 * Update head regs etc., every 16 packets, if not last pkt,
+	 * to help prevent rcvhdrq overflows, when many packets
+	 * are processed and queue is nearly full.
+	 * Don't request an interrupt for intermediate updates.
+	 */
+	if (!last && !(packet->numpkt & 0xf)) {
+		update_usrhead(packet->rcd, packet->rhqoff, packet->updegr,
+			       packet->etail, 0, 0);
+		packet->updegr = 0;
+	}
+	packet->grh = NULL;
+}
+
+static inline void finish_packet(struct hfi1_packet *packet)
+{
+	/*
+	 * Nothing we need to free for the packet.
+	 *
+	 * The only thing we need to do is a final update and call for an
+	 * interrupt
+	 */
+	update_usrhead(packet->rcd, hfi1_rcd_head(packet->rcd), packet->updegr,
+		       packet->etail, rcv_intr_dynamic, packet->numpkt);
+}
+
+/*
+ * handle_receive_interrupt_napi_fp - receive a packet
+ * @rcd: the context
+ * @budget: polling budget
+ *
+ * Called from interrupt handler for receive interrupt.
+ * This is the fast path interrupt handler
+ * when executing napi soft irq environment.
+ */
+int handle_receive_interrupt_napi_fp(struct hfi1_ctxtdata *rcd, int budget)
+{
+	struct hfi1_packet packet;
+
+	init_packet(rcd, &packet);
+	if (last_rcv_seq(rcd, rhf_rcv_seq(packet.rhf)))
+		goto bail;
+
+	while (packet.numpkt < budget) {
+		process_rcv_packet_napi(&packet);
+		if (hfi1_seq_incr(rcd, rhf_rcv_seq(packet.rhf)))
+			break;
+
+		process_rcv_update(0, &packet);
+	}
+	hfi1_set_rcd_head(rcd, packet.rhqoff);
+bail:
+	finish_packet(&packet);
+	return packet.numpkt;
+}
+
+/*
+ * Handle receive interrupts when using the no dma rtail option.
+ */
+int handle_receive_interrupt_nodma_rtail(struct hfi1_ctxtdata *rcd, int thread)
+{
+	int last = RCV_PKT_OK;
+	struct hfi1_packet packet;
+
+	init_packet(rcd, &packet);
+	if (last_rcv_seq(rcd, rhf_rcv_seq(packet.rhf))) {
+		last = RCV_PKT_DONE;
+		goto bail;
+	}
+
+	prescan_rxq(rcd, &packet);
+
+	while (last == RCV_PKT_OK) {
+		last = process_rcv_packet(&packet, thread);
+		if (hfi1_seq_incr(rcd, rhf_rcv_seq(packet.rhf)))
+			last = RCV_PKT_DONE;
+		process_rcv_update(last, &packet);
+	}
+	process_rcv_qp_work(&packet);
+	hfi1_set_rcd_head(rcd, packet.rhqoff);
+bail:
+	finish_packet(&packet);
+	return last;
+}
+
+int handle_receive_interrupt_dma_rtail(struct hfi1_ctxtdata *rcd, int thread)
+{
+	u32 hdrqtail;
+	int last = RCV_PKT_OK;
+	struct hfi1_packet packet;
+
+	init_packet(rcd, &packet);
+	hdrqtail = get_rcvhdrtail(rcd);
+	if (packet.rhqoff == hdrqtail) {
+		last = RCV_PKT_DONE;
+		goto bail;
+	}
+	smp_rmb();  /* prevent speculative reads of dma'ed hdrq */
+
+	prescan_rxq(rcd, &packet);
+
+	while (last == RCV_PKT_OK) {
+		last = process_rcv_packet(&packet, thread);
+		if (packet.rhqoff == hdrqtail)
+			last = RCV_PKT_DONE;
+		process_rcv_update(last, &packet);
+	}
+	process_rcv_qp_work(&packet);
+	hfi1_set_rcd_head(rcd, packet.rhqoff);
+bail:
+	finish_packet(&packet);
+	return last;
+}
+
+static void set_all_fastpath(struct hfi1_devdata *dd, struct hfi1_ctxtdata *rcd)
+{
+	u16 i;
+
+	/*
+	 * For dynamically allocated kernel contexts (like vnic) switch
+	 * interrupt handler only for that context. Otherwise, switch
+	 * interrupt handler for all statically allocated kernel contexts.
+	 */
+	if (rcd->ctxt >= dd->first_dyn_alloc_ctxt && !rcd->is_vnic) {
+		hfi1_rcd_get(rcd);
+		hfi1_set_fast(rcd);
+		hfi1_rcd_put(rcd);
+		return;
+	}
+
+	for (i = HFI1_CTRL_CTXT + 1; i < dd->num_rcv_contexts; i++) {
+		rcd = hfi1_rcd_get_by_index(dd, i);
+		if (rcd && (i < dd->first_dyn_alloc_ctxt || rcd->is_vnic))
+			hfi1_set_fast(rcd);
+		hfi1_rcd_put(rcd);
+	}
+}
+
+void set_all_slowpath(struct hfi1_devdata *dd)
+{
+	struct hfi1_ctxtdata *rcd;
+	u16 i;
+
+	/* HFI1_CTRL_CTXT must always use the slow path interrupt handler */
+	for (i = HFI1_CTRL_CTXT + 1; i < dd->num_rcv_contexts; i++) {
+		rcd = hfi1_rcd_get_by_index(dd, i);
+		if (!rcd)
+			continue;
+		if (i < dd->first_dyn_alloc_ctxt || rcd->is_vnic)
+			rcd->do_interrupt = rcd->slow_handler;
+
+		hfi1_rcd_put(rcd);
+	}
+}
+
+static bool __set_armed_to_active(struct hfi1_packet *packet)
+{
+	u8 etype = rhf_rcv_type(packet->rhf);
+	u8 sc = SC15_PACKET;
+
+	if (etype == RHF_RCV_TYPE_IB) {
+		struct ib_header *hdr = hfi1_get_msgheader(packet->rcd,
+							   packet->rhf_addr);
+		sc = hfi1_9B_get_sc5(hdr, packet->rhf);
+	} else if (etype == RHF_RCV_TYPE_BYPASS) {
+		struct hfi1_16b_header *hdr = hfi1_get_16B_header(
+						packet->rcd,
+						packet->rhf_addr);
+		sc = hfi1_16B_get_sc(hdr);
+	}
+	if (sc != SC15_PACKET) {
+		int hwstate = driver_lstate(packet->rcd->ppd);
+		struct work_struct *lsaw =
+				&packet->rcd->ppd->linkstate_active_work;
+
+		if (hwstate != IB_PORT_ACTIVE) {
+			dd_dev_info(packet->rcd->dd,
+				    "Unexpected link state %s\n",
+				    opa_lstate_name(hwstate));
+			return false;
+		}
+
+		queue_work(packet->rcd->ppd->link_wq, lsaw);
+		return true;
+	}
+	return false;
+}
+
+/**
+ * set_armed_to_active  - the fast path for armed to active
+ * @packet: the packet structure
+ *
+ * Return true if packet processing needs to bail.
+ */
+static bool set_armed_to_active(struct hfi1_packet *packet)
+{
+	if (likely(packet->rcd->ppd->host_link_state != HLS_UP_ARMED))
+		return false;
+	return __set_armed_to_active(packet);
+}
+
+/*
+ * handle_receive_interrupt - receive a packet
+ * @rcd: the context
+ *
+ * Called from interrupt handler for errors or receive interrupt.
+ * This is the slow path interrupt handler.
+ */
+int handle_receive_interrupt(struct hfi1_ctxtdata *rcd, int thread)
+{
+	struct hfi1_devdata *dd = rcd->dd;
+	u32 hdrqtail;
+	int needset, last = RCV_PKT_OK;
+	struct hfi1_packet packet;
+	int skip_pkt = 0;
+
+	if (!rcd->rcvhdrq)
+		return RCV_PKT_OK;
+	/* Control context will always use the slow path interrupt handler */
+	needset = (rcd->ctxt == HFI1_CTRL_CTXT) ? 0 : 1;
+
+	init_packet(rcd, &packet);
+
+	if (!get_dma_rtail_setting(rcd)) {
+		if (last_rcv_seq(rcd, rhf_rcv_seq(packet.rhf))) {
+			last = RCV_PKT_DONE;
+			goto bail;
+		}
+		hdrqtail = 0;
+	} else {
+		hdrqtail = get_rcvhdrtail(rcd);
+		if (packet.rhqoff == hdrqtail) {
+			last = RCV_PKT_DONE;
+			goto bail;
+		}
+		smp_rmb();  /* prevent speculative reads of dma'ed hdrq */
+
+		/*
+		 * Control context can potentially receive an invalid
+		 * rhf. Drop such packets.
+		 */
+		if (rcd->ctxt == HFI1_CTRL_CTXT)
+			if (last_rcv_seq(rcd, rhf_rcv_seq(packet.rhf)))
+				skip_pkt = 1;
+	}
+
+	prescan_rxq(rcd, &packet);
+
+	while (last == RCV_PKT_OK) {
+		if (hfi1_need_drop(dd)) {
+			/* On to the next packet */
+			packet.rhqoff += packet.rsize;
+			packet.rhf_addr = (__le32 *)rcd->rcvhdrq +
+					  packet.rhqoff +
+					  rcd->rhf_offset;
+			packet.rhf = rhf_to_cpu(packet.rhf_addr);
+
+		} else if (skip_pkt) {
+			last = skip_rcv_packet(&packet, thread);
+			skip_pkt = 0;
+		} else {
+			if (set_armed_to_active(&packet))
+				goto bail;
+			last = process_rcv_packet(&packet, thread);
+		}
+
+		if (!get_dma_rtail_setting(rcd)) {
+			if (hfi1_seq_incr(rcd, rhf_rcv_seq(packet.rhf)))
+				last = RCV_PKT_DONE;
+		} else {
+			if (packet.rhqoff == hdrqtail)
+				last = RCV_PKT_DONE;
+			/*
+			 * Control context can potentially receive an invalid
+			 * rhf. Drop such packets.
+			 */
+			if (rcd->ctxt == HFI1_CTRL_CTXT) {
+				bool lseq;
+
+				lseq = hfi1_seq_incr(rcd,
+						     rhf_rcv_seq(packet.rhf));
+				if (!last && lseq)
+					skip_pkt = 1;
+			}
+		}
+
+		if (needset) {
+			needset = false;
+			set_all_fastpath(dd, rcd);
+		}
+		process_rcv_update(last, &packet);
+	}
+
+	process_rcv_qp_work(&packet);
+	hfi1_set_rcd_head(rcd, packet.rhqoff);
+
+bail:
+	/*
+	 * Always write head at end, and setup rcv interrupt, even
+	 * if no packets were processed.
+	 */
+	finish_packet(&packet);
+	return last;
+}
+
+/*
+ * handle_receive_interrupt_napi_sp - receive a packet
+ * @rcd: the context
+ * @budget: polling budget
+ *
+ * Called from interrupt handler for errors or receive interrupt.
+ * This is the slow path interrupt handler
+ * when executing napi soft irq environment.
+ */
+int handle_receive_interrupt_napi_sp(struct hfi1_ctxtdata *rcd, int budget)
+{
+	struct hfi1_devdata *dd = rcd->dd;
+	int last = RCV_PKT_OK;
+	bool needset = true;
+	struct hfi1_packet packet;
+
+	init_packet(rcd, &packet);
+	if (last_rcv_seq(rcd, rhf_rcv_seq(packet.rhf)))
+		goto bail;
+
+	while (last != RCV_PKT_DONE && packet.numpkt < budget) {
+		if (hfi1_need_drop(dd)) {
+			/* On to the next packet */
+			packet.rhqoff += packet.rsize;
+			packet.rhf_addr = (__le32 *)rcd->rcvhdrq +
+					  packet.rhqoff +
+					  rcd->rhf_offset;
+			packet.rhf = rhf_to_cpu(packet.rhf_addr);
+
+		} else {
+			if (set_armed_to_active(&packet))
+				goto bail;
+			process_rcv_packet_napi(&packet);
+		}
+
+		if (hfi1_seq_incr(rcd, rhf_rcv_seq(packet.rhf)))
+			last = RCV_PKT_DONE;
+
+		if (needset) {
+			needset = false;
+			set_all_fastpath(dd, rcd);
+		}
+
+		process_rcv_update(last, &packet);
+	}
+
+	hfi1_set_rcd_head(rcd, packet.rhqoff);
+
+bail:
+	/*
+	 * Always write head at end, and setup rcv interrupt, even
+	 * if no packets were processed.
+	 */
+	finish_packet(&packet);
+	return packet.numpkt;
+}
+
+/*
+ * We may discover in the interrupt that the hardware link state has
+ * changed from ARMED to ACTIVE (due to the arrival of a non-SC15 packet),
+ * and we need to update the driver's notion of the link state.  We cannot
+ * run set_link_state from interrupt context, so we queue this function on
+ * a workqueue.
+ *
+ * We delay the regular interrupt processing until after the state changes
+ * so that the link will be in the correct state by the time any application
+ * we wake up attempts to send a reply to any message it received.
+ * (Subsequent receive interrupts may possibly force the wakeup before we
+ * update the link state.)
+ *
+ * The rcd is freed in hfi1_free_ctxtdata after hfi1_postinit_cleanup invokes
+ * dd->f_cleanup(dd) to disable the interrupt handler and flush workqueues,
+ * so we're safe from use-after-free of the rcd.
+ */
+void receive_interrupt_work(struct work_struct *work)
+{
+	struct hfi1_pportdata *ppd = container_of(work, struct hfi1_pportdata,
+						  linkstate_active_work);
+	struct hfi1_devdata *dd = ppd->dd;
+	struct hfi1_ctxtdata *rcd;
+	u16 i;
+
+	/* Received non-SC15 packet implies neighbor_normal */
+	ppd->neighbor_normal = 1;
+	set_link_state(ppd, HLS_UP_ACTIVE);
+
+	/*
+	 * Interrupt all statically allocated kernel contexts that could
+	 * have had an interrupt during auto activation.
+	 */
+	for (i = HFI1_CTRL_CTXT; i < dd->first_dyn_alloc_ctxt; i++) {
+		rcd = hfi1_rcd_get_by_index(dd, i);
+		if (rcd)
+			force_recv_intr(rcd);
+		hfi1_rcd_put(rcd);
+	}
+}
+
+/*
+ * Convert a given MTU size to the on-wire MAD packet enumeration.
+ * Return -1 if the size is invalid.
+ */
+int mtu_to_enum(u32 mtu, int default_if_bad)
+{
+	switch (mtu) {
+	case     0: return OPA_MTU_0;
+	case   256: return OPA_MTU_256;
+	case   512: return OPA_MTU_512;
+	case  1024: return OPA_MTU_1024;
+	case  2048: return OPA_MTU_2048;
+	case  4096: return OPA_MTU_4096;
+	case  8192: return OPA_MTU_8192;
+	case 10240: return OPA_MTU_10240;
+	}
+	return default_if_bad;
+}
+
+u16 enum_to_mtu(int mtu)
+{
+	switch (mtu) {
+	case OPA_MTU_0:     return 0;
+	case OPA_MTU_256:   return 256;
+	case OPA_MTU_512:   return 512;
+	case OPA_MTU_1024:  return 1024;
+	case OPA_MTU_2048:  return 2048;
+	case OPA_MTU_4096:  return 4096;
+	case OPA_MTU_8192:  return 8192;
+	case OPA_MTU_10240: return 10240;
+	default: return 0xffff;
+	}
+}
+
+/*
+ * set_mtu - set the MTU
+ * @ppd: the per port data
+ *
+ * We can handle "any" incoming size, the issue here is whether we
+ * need to restrict our outgoing size.  We do not deal with what happens
+ * to programs that are already running when the size changes.
+ */
+int set_mtu(struct hfi1_pportdata *ppd)
+{
+	struct hfi1_devdata *dd = ppd->dd;
+	int i, drain, ret = 0, is_up = 0;
+
+	ppd->ibmtu = 0;
+	for (i = 0; i < ppd->vls_supported; i++)
+		if (ppd->ibmtu < dd->vld[i].mtu)
+			ppd->ibmtu = dd->vld[i].mtu;
+	ppd->ibmaxlen = ppd->ibmtu + lrh_max_header_bytes(ppd->dd);
+
+	mutex_lock(&ppd->hls_lock);
+	if (ppd->host_link_state == HLS_UP_INIT ||
+	    ppd->host_link_state == HLS_UP_ARMED ||
+	    ppd->host_link_state == HLS_UP_ACTIVE)
+		is_up = 1;
+
+	drain = !is_ax(dd) && is_up;
+
+	if (drain)
+		/*
+		 * MTU is specified per-VL. To ensure that no packet gets
+		 * stuck (due, e.g., to the MTU for the packet's VL being
+		 * reduced), empty the per-VL FIFOs before adjusting MTU.
+		 */
+		ret = stop_drain_data_vls(dd);
+
+	if (ret) {
+		dd_dev_err(dd, "%s: cannot stop/drain VLs - refusing to change per-VL MTUs\n",
+			   __func__);
+		goto err;
+	}
+
+	hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_MTU, 0);
+
+	if (drain)
+		open_fill_data_vls(dd); /* reopen all VLs */
+
+err:
+	mutex_unlock(&ppd->hls_lock);
+
+	return ret;
+}
+
+int hfi1_set_lid(struct hfi1_pportdata *ppd, u32 lid, u8 lmc)
+{
+	struct hfi1_devdata *dd = ppd->dd;
+
+	ppd->lid = lid;
+	ppd->lmc = lmc;
+	hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_LIDLMC, 0);
+
+	dd_dev_info(dd, "port %u: got a lid: 0x%x\n", ppd->port, lid);
+
+	return 0;
+}
+
+void shutdown_led_override(struct hfi1_pportdata *ppd)
+{
+	struct hfi1_devdata *dd = ppd->dd;
+
+	/*
+	 * This pairs with the memory barrier in hfi1_start_led_override to
+	 * ensure that we read the correct state of LED beaconing represented
+	 * by led_override_timer_active
+	 */
+	smp_rmb();
+	if (atomic_read(&ppd->led_override_timer_active)) {
+		del_timer_sync(&ppd->led_override_timer);
+		atomic_set(&ppd->led_override_timer_active, 0);
+		/* Ensure the atomic_set is visible to all CPUs */
+		smp_wmb();
+	}
+
+	/* Hand control of the LED to the DC for normal operation */
+	write_csr(dd, DCC_CFG_LED_CNTRL, 0);
+}
+
+static void run_led_override(struct timer_list *t)
+{
+	struct hfi1_pportdata *ppd = from_timer(ppd, t, led_override_timer);
+	struct hfi1_devdata *dd = ppd->dd;
+	unsigned long timeout;
+	int phase_idx;
+
+	if (!(dd->flags & HFI1_INITTED))
+		return;
+
+	phase_idx = ppd->led_override_phase & 1;
+
+	setextled(dd, phase_idx);
+
+	timeout = ppd->led_override_vals[phase_idx];
+
+	/* Set up for next phase */
+	ppd->led_override_phase = !ppd->led_override_phase;
+
+	mod_timer(&ppd->led_override_timer, jiffies + timeout);
+}
+
+/*
+ * To have the LED blink in a particular pattern, provide timeon and timeoff
+ * in milliseconds.
+ * To turn off custom blinking and return to normal operation, use
+ * shutdown_led_override()
+ */
+void hfi1_start_led_override(struct hfi1_pportdata *ppd, unsigned int timeon,
+			     unsigned int timeoff)
+{
+	if (!(ppd->dd->flags & HFI1_INITTED))
+		return;
+
+	/* Convert to jiffies for direct use in timer */
+	ppd->led_override_vals[0] = msecs_to_jiffies(timeoff);
+	ppd->led_override_vals[1] = msecs_to_jiffies(timeon);
+
+	/* Arbitrarily start from LED on phase */
+	ppd->led_override_phase = 1;
+
+	/*
+	 * If the timer has not already been started, do so. Use a "quick"
+	 * timeout so the handler will be called soon to look at our request.
+	 */
+	if (!timer_pending(&ppd->led_override_timer)) {
+		timer_setup(&ppd->led_override_timer, run_led_override, 0);
+		ppd->led_override_timer.expires = jiffies + 1;
+		add_timer(&ppd->led_override_timer);
+		atomic_set(&ppd->led_override_timer_active, 1);
+		/* Ensure the atomic_set is visible to all CPUs */
+		smp_wmb();
+	}
+}
+
+/**
+ * hfi1_reset_device - reset the chip if possible
+ * @unit: the device to reset
+ *
+ * Whether or not reset is successful, we attempt to re-initialize the chip
+ * (that is, much like a driver unload/reload).  We clear the INITTED flag
+ * so that the various entry points will fail until we reinitialize.  For
+ * now, we only allow this if no user contexts are open that use chip resources
+ */
+int hfi1_reset_device(int unit)
+{
+	int ret;
+	struct hfi1_devdata *dd = hfi1_lookup(unit);
+	struct hfi1_pportdata *ppd;
+	int pidx;
+
+	if (!dd) {
+		ret = -ENODEV;
+		goto bail;
+	}
+
+	dd_dev_info(dd, "Reset on unit %u requested\n", unit);
+
+	if (!dd->kregbase1 || !(dd->flags & HFI1_PRESENT)) {
+		dd_dev_info(dd,
+			    "Invalid unit number %u or not initialized or not present\n",
+			    unit);
+		ret = -ENXIO;
+		goto bail;
+	}
+
+	/* If there are any user/vnic contexts, we cannot reset */
+	mutex_lock(&hfi1_mutex);
+	if (dd->rcd)
+		if (hfi1_stats.sps_ctxts) {
+			mutex_unlock(&hfi1_mutex);
+			ret = -EBUSY;
+			goto bail;
+		}
+	mutex_unlock(&hfi1_mutex);
+
+	for (pidx = 0; pidx < dd->num_pports; ++pidx) {
+		ppd = dd->pport + pidx;
+
+		shutdown_led_override(ppd);
+	}
+	if (dd->flags & HFI1_HAS_SEND_DMA)
+		sdma_exit(dd);
+
+	hfi1_reset_cpu_counters(dd);
+
+	ret = hfi1_init(dd, 1);
+
+	if (ret)
+		dd_dev_err(dd,
+			   "Reinitialize unit %u after reset failed with %d\n",
+			   unit, ret);
+	else
+		dd_dev_info(dd, "Reinitialized unit %u after resetting\n",
+			    unit);
+
+bail:
+	return ret;
+}
+
+static inline void hfi1_setup_ib_header(struct hfi1_packet *packet)
+{
+	packet->hdr = (struct hfi1_ib_message_header *)
+			hfi1_get_msgheader(packet->rcd,
+					   packet->rhf_addr);
+	packet->hlen = (u8 *)packet->rhf_addr - (u8 *)packet->hdr;
+}
+
+static int hfi1_bypass_ingress_pkt_check(struct hfi1_packet *packet)
+{
+	struct hfi1_pportdata *ppd = packet->rcd->ppd;
+
+	/* slid and dlid cannot be 0 */
+	if ((!packet->slid) || (!packet->dlid))
+		return -EINVAL;
+
+	/* Compare port lid with incoming packet dlid */
+	if ((!(hfi1_is_16B_mcast(packet->dlid))) &&
+	    (packet->dlid !=
+		opa_get_lid(be32_to_cpu(OPA_LID_PERMISSIVE), 16B))) {
+		if ((packet->dlid & ~((1 << ppd->lmc) - 1)) != ppd->lid)
+			return -EINVAL;
+	}
+
+	/* No multicast packets with SC15 */
+	if ((hfi1_is_16B_mcast(packet->dlid)) && (packet->sc == 0xF))
+		return -EINVAL;
+
+	/* Packets with permissive DLID always on SC15 */
+	if ((packet->dlid == opa_get_lid(be32_to_cpu(OPA_LID_PERMISSIVE),
+					 16B)) &&
+	    (packet->sc != 0xF))
+		return -EINVAL;
+
+	return 0;
+}
+
+static int hfi1_setup_9B_packet(struct hfi1_packet *packet)
+{
+	struct hfi1_ibport *ibp = rcd_to_iport(packet->rcd);
+	struct ib_header *hdr;
+	u8 lnh;
+
+	hfi1_setup_ib_header(packet);
+	hdr = packet->hdr;
+
+	lnh = ib_get_lnh(hdr);
+	if (lnh == HFI1_LRH_BTH) {
+		packet->ohdr = &hdr->u.oth;
+		packet->grh = NULL;
+	} else if (lnh == HFI1_LRH_GRH) {
+		u32 vtf;
+
+		packet->ohdr = &hdr->u.l.oth;
+		packet->grh = &hdr->u.l.grh;
+		if (packet->grh->next_hdr != IB_GRH_NEXT_HDR)
+			goto drop;
+		vtf = be32_to_cpu(packet->grh->version_tclass_flow);
+		if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION)
+			goto drop;
+	} else {
+		goto drop;
+	}
+
+	/* Query commonly used fields from packet header */
+	packet->payload = packet->ebuf;
+	packet->opcode = ib_bth_get_opcode(packet->ohdr);
+	packet->slid = ib_get_slid(hdr);
+	packet->dlid = ib_get_dlid(hdr);
+	if (unlikely((packet->dlid >= be16_to_cpu(IB_MULTICAST_LID_BASE)) &&
+		     (packet->dlid != be16_to_cpu(IB_LID_PERMISSIVE))))
+		packet->dlid += opa_get_mcast_base(OPA_MCAST_NR) -
+				be16_to_cpu(IB_MULTICAST_LID_BASE);
+	packet->sl = ib_get_sl(hdr);
+	packet->sc = hfi1_9B_get_sc5(hdr, packet->rhf);
+	packet->pad = ib_bth_get_pad(packet->ohdr);
+	packet->extra_byte = 0;
+	packet->pkey = ib_bth_get_pkey(packet->ohdr);
+	packet->migrated = ib_bth_is_migration(packet->ohdr);
+
+	return 0;
+drop:
+	ibp->rvp.n_pkt_drops++;
+	return -EINVAL;
+}
+
+static int hfi1_setup_bypass_packet(struct hfi1_packet *packet)
+{
+	/*
+	 * Bypass packets have a different header/payload split
+	 * compared to an IB packet.
+	 * Current split is set such that 16 bytes of the actual
+	 * header is in the header buffer and the remining is in
+	 * the eager buffer. We chose 16 since hfi1 driver only
+	 * supports 16B bypass packets and we will be able to
+	 * receive the entire LRH with such a split.
+	 */
+
+	struct hfi1_ctxtdata *rcd = packet->rcd;
+	struct hfi1_pportdata *ppd = rcd->ppd;
+	struct hfi1_ibport *ibp = &ppd->ibport_data;
+	u8 l4;
+
+	packet->hdr = (struct hfi1_16b_header *)
+			hfi1_get_16B_header(packet->rcd,
+					    packet->rhf_addr);
+	l4 = hfi1_16B_get_l4(packet->hdr);
+	if (l4 == OPA_16B_L4_IB_LOCAL) {
+		packet->ohdr = packet->ebuf;
+		packet->grh = NULL;
+		packet->opcode = ib_bth_get_opcode(packet->ohdr);
+		packet->pad = hfi1_16B_bth_get_pad(packet->ohdr);
+		/* hdr_len_by_opcode already has an IB LRH factored in */
+		packet->hlen = hdr_len_by_opcode[packet->opcode] +
+			(LRH_16B_BYTES - LRH_9B_BYTES);
+		packet->migrated = opa_bth_is_migration(packet->ohdr);
+	} else if (l4 == OPA_16B_L4_IB_GLOBAL) {
+		u32 vtf;
+		u8 grh_len = sizeof(struct ib_grh);
+
+		packet->ohdr = packet->ebuf + grh_len;
+		packet->grh = packet->ebuf;
+		packet->opcode = ib_bth_get_opcode(packet->ohdr);
+		packet->pad = hfi1_16B_bth_get_pad(packet->ohdr);
+		/* hdr_len_by_opcode already has an IB LRH factored in */
+		packet->hlen = hdr_len_by_opcode[packet->opcode] +
+			(LRH_16B_BYTES - LRH_9B_BYTES) + grh_len;
+		packet->migrated = opa_bth_is_migration(packet->ohdr);
+
+		if (packet->grh->next_hdr != IB_GRH_NEXT_HDR)
+			goto drop;
+		vtf = be32_to_cpu(packet->grh->version_tclass_flow);
+		if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION)
+			goto drop;
+	} else if (l4 == OPA_16B_L4_FM) {
+		packet->mgmt = packet->ebuf;
+		packet->ohdr = NULL;
+		packet->grh = NULL;
+		packet->opcode = IB_OPCODE_UD_SEND_ONLY;
+		packet->pad = OPA_16B_L4_FM_PAD;
+		packet->hlen = OPA_16B_L4_FM_HLEN;
+		packet->migrated = false;
+	} else {
+		goto drop;
+	}
+
+	/* Query commonly used fields from packet header */
+	packet->payload = packet->ebuf + packet->hlen - LRH_16B_BYTES;
+	packet->slid = hfi1_16B_get_slid(packet->hdr);
+	packet->dlid = hfi1_16B_get_dlid(packet->hdr);
+	if (unlikely(hfi1_is_16B_mcast(packet->dlid)))
+		packet->dlid += opa_get_mcast_base(OPA_MCAST_NR) -
+				opa_get_lid(opa_get_mcast_base(OPA_MCAST_NR),
+					    16B);
+	packet->sc = hfi1_16B_get_sc(packet->hdr);
+	packet->sl = ibp->sc_to_sl[packet->sc];
+	packet->extra_byte = SIZE_OF_LT;
+	packet->pkey = hfi1_16B_get_pkey(packet->hdr);
+
+	if (hfi1_bypass_ingress_pkt_check(packet))
+		goto drop;
+
+	return 0;
+drop:
+	hfi1_cdbg(PKT, "%s: packet dropped\n", __func__);
+	ibp->rvp.n_pkt_drops++;
+	return -EINVAL;
+}
+
+static void show_eflags_errs(struct hfi1_packet *packet)
+{
+	struct hfi1_ctxtdata *rcd = packet->rcd;
+	u32 rte = rhf_rcv_type_err(packet->rhf);
+
+	dd_dev_err(rcd->dd,
+		   "receive context %d: rhf 0x%016llx, errs [ %s%s%s%s%s%s%s] rte 0x%x\n",
+		   rcd->ctxt, packet->rhf,
+		   packet->rhf & RHF_K_HDR_LEN_ERR ? "k_hdr_len " : "",
+		   packet->rhf & RHF_DC_UNC_ERR ? "dc_unc " : "",
+		   packet->rhf & RHF_DC_ERR ? "dc " : "",
+		   packet->rhf & RHF_TID_ERR ? "tid " : "",
+		   packet->rhf & RHF_LEN_ERR ? "len " : "",
+		   packet->rhf & RHF_ECC_ERR ? "ecc " : "",
+		   packet->rhf & RHF_ICRC_ERR ? "icrc " : "",
+		   rte);
+}
+
+void handle_eflags(struct hfi1_packet *packet)
+{
+	struct hfi1_ctxtdata *rcd = packet->rcd;
+
+	rcv_hdrerr(rcd, rcd->ppd, packet);
+	if (rhf_err_flags(packet->rhf))
+		show_eflags_errs(packet);
+}
+
+static void hfi1_ipoib_ib_rcv(struct hfi1_packet *packet)
+{
+	struct hfi1_ibport *ibp;
+	struct net_device *netdev;
+	struct hfi1_ctxtdata *rcd = packet->rcd;
+	struct napi_struct *napi = rcd->napi;
+	struct sk_buff *skb;
+	struct hfi1_netdev_rxq *rxq = container_of(napi,
+			struct hfi1_netdev_rxq, napi);
+	u32 extra_bytes;
+	u32 tlen, qpnum;
+	bool do_work, do_cnp;
+
+	trace_hfi1_rcvhdr(packet);
+
+	hfi1_setup_ib_header(packet);
+
+	packet->ohdr = &((struct ib_header *)packet->hdr)->u.oth;
+	packet->grh = NULL;
+
+	if (unlikely(rhf_err_flags(packet->rhf))) {
+		handle_eflags(packet);
+		return;
+	}
+
+	qpnum = ib_bth_get_qpn(packet->ohdr);
+	netdev = hfi1_netdev_get_data(rcd->dd, qpnum);
+	if (!netdev)
+		goto drop_no_nd;
+
+	trace_input_ibhdr(rcd->dd, packet, !!(rhf_dc_info(packet->rhf)));
+	trace_ctxt_rsm_hist(rcd->ctxt);
+
+	/* handle congestion notifications */
+	do_work = hfi1_may_ecn(packet);
+	if (unlikely(do_work)) {
+		do_cnp = (packet->opcode != IB_OPCODE_CNP);
+		(void)hfi1_process_ecn_slowpath(hfi1_ipoib_priv(netdev)->qp,
+						 packet, do_cnp);
+	}
+
+	/*
+	 * We have split point after last byte of DETH
+	 * lets strip padding and CRC and ICRC.
+	 * tlen is whole packet len so we need to
+	 * subtract header size as well.
+	 */
+	tlen = packet->tlen;
+	extra_bytes = ib_bth_get_pad(packet->ohdr) + (SIZE_OF_CRC << 2) +
+			packet->hlen;
+	if (unlikely(tlen < extra_bytes))
+		goto drop;
+
+	tlen -= extra_bytes;
+
+	skb = hfi1_ipoib_prepare_skb(rxq, tlen, packet->ebuf);
+	if (unlikely(!skb))
+		goto drop;
+
+	dev_sw_netstats_rx_add(netdev, skb->len);
+
+	skb->dev = netdev;
+	skb->pkt_type = PACKET_HOST;
+	netif_receive_skb(skb);
+
+	return;
+
+drop:
+	++netdev->stats.rx_dropped;
+drop_no_nd:
+	ibp = rcd_to_iport(packet->rcd);
+	++ibp->rvp.n_pkt_drops;
+}
+
+/*
+ * The following functions are called by the interrupt handler. They are type
+ * specific handlers for each packet type.
+ */
+static void process_receive_ib(struct hfi1_packet *packet)
+{
+	if (hfi1_setup_9B_packet(packet))
+		return;
+
+	if (unlikely(hfi1_dbg_should_fault_rx(packet)))
+		return;
+
+	trace_hfi1_rcvhdr(packet);
+
+	if (unlikely(rhf_err_flags(packet->rhf))) {
+		handle_eflags(packet);
+		return;
+	}
+
+	hfi1_ib_rcv(packet);
+}
+
+static void process_receive_bypass(struct hfi1_packet *packet)
+{
+	struct hfi1_devdata *dd = packet->rcd->dd;
+
+	if (hfi1_setup_bypass_packet(packet))
+		return;
+
+	trace_hfi1_rcvhdr(packet);
+
+	if (unlikely(rhf_err_flags(packet->rhf))) {
+		handle_eflags(packet);
+		return;
+	}
+
+	if (hfi1_16B_get_l2(packet->hdr) == 0x2) {
+		hfi1_16B_rcv(packet);
+	} else {
+		dd_dev_err(dd,
+			   "Bypass packets other than 16B are not supported in normal operation. Dropping\n");
+		incr_cntr64(&dd->sw_rcv_bypass_packet_errors);
+		if (!(dd->err_info_rcvport.status_and_code &
+		      OPA_EI_STATUS_SMASK)) {
+			u64 *flits = packet->ebuf;
+
+			if (flits && !(packet->rhf & RHF_LEN_ERR)) {
+				dd->err_info_rcvport.packet_flit1 = flits[0];
+				dd->err_info_rcvport.packet_flit2 =
+					packet->tlen > sizeof(flits[0]) ?
+					flits[1] : 0;
+			}
+			dd->err_info_rcvport.status_and_code |=
+				(OPA_EI_STATUS_SMASK | BAD_L2_ERR);
+		}
+	}
+}
+
+static void process_receive_error(struct hfi1_packet *packet)
+{
+	/* KHdrHCRCErr -- KDETH packet with a bad HCRC */
+	if (unlikely(
+		 hfi1_dbg_fault_suppress_err(&packet->rcd->dd->verbs_dev) &&
+		 (rhf_rcv_type_err(packet->rhf) == RHF_RCV_TYPE_ERROR ||
+		  packet->rhf & RHF_DC_ERR)))
+		return;
+
+	hfi1_setup_ib_header(packet);
+	handle_eflags(packet);
+
+	if (unlikely(rhf_err_flags(packet->rhf)))
+		dd_dev_err(packet->rcd->dd,
+			   "Unhandled error packet received. Dropping.\n");
+}
+
+static void kdeth_process_expected(struct hfi1_packet *packet)
+{
+	hfi1_setup_9B_packet(packet);
+	if (unlikely(hfi1_dbg_should_fault_rx(packet)))
+		return;
+
+	if (unlikely(rhf_err_flags(packet->rhf))) {
+		struct hfi1_ctxtdata *rcd = packet->rcd;
+
+		if (hfi1_handle_kdeth_eflags(rcd, rcd->ppd, packet))
+			return;
+	}
+
+	hfi1_kdeth_expected_rcv(packet);
+}
+
+static void kdeth_process_eager(struct hfi1_packet *packet)
+{
+	hfi1_setup_9B_packet(packet);
+	if (unlikely(hfi1_dbg_should_fault_rx(packet)))
+		return;
+
+	trace_hfi1_rcvhdr(packet);
+	if (unlikely(rhf_err_flags(packet->rhf))) {
+		struct hfi1_ctxtdata *rcd = packet->rcd;
+
+		show_eflags_errs(packet);
+		if (hfi1_handle_kdeth_eflags(rcd, rcd->ppd, packet))
+			return;
+	}
+
+	hfi1_kdeth_eager_rcv(packet);
+}
+
+static void process_receive_invalid(struct hfi1_packet *packet)
+{
+	dd_dev_err(packet->rcd->dd, "Invalid packet type %d. Dropping\n",
+		   rhf_rcv_type(packet->rhf));
+}
+
+#define HFI1_RCVHDR_DUMP_MAX	5
+
+void seqfile_dump_rcd(struct seq_file *s, struct hfi1_ctxtdata *rcd)
+{
+	struct hfi1_packet packet;
+	struct ps_mdata mdata;
+	int i;
+
+	seq_printf(s, "Rcd %u: RcvHdr cnt %u entsize %u %s ctrl 0x%08llx status 0x%08llx, head %llu tail %llu  sw head %u\n",
+		   rcd->ctxt, get_hdrq_cnt(rcd), get_hdrqentsize(rcd),
+		   get_dma_rtail_setting(rcd) ?
+		   "dma_rtail" : "nodma_rtail",
+		   read_kctxt_csr(rcd->dd, rcd->ctxt, RCV_CTXT_CTRL),
+		   read_kctxt_csr(rcd->dd, rcd->ctxt, RCV_CTXT_STATUS),
+		   read_uctxt_csr(rcd->dd, rcd->ctxt, RCV_HDR_HEAD) &
+		   RCV_HDR_HEAD_HEAD_MASK,
+		   read_uctxt_csr(rcd->dd, rcd->ctxt, RCV_HDR_TAIL),
+		   rcd->head);
+
+	init_packet(rcd, &packet);
+	init_ps_mdata(&mdata, &packet);
+
+	for (i = 0; i < HFI1_RCVHDR_DUMP_MAX; i++) {
+		__le32 *rhf_addr = (__le32 *)rcd->rcvhdrq + mdata.ps_head +
+					 rcd->rhf_offset;
+		struct ib_header *hdr;
+		u64 rhf = rhf_to_cpu(rhf_addr);
+		u32 etype = rhf_rcv_type(rhf), qpn;
+		u8 opcode;
+		u32 psn;
+		u8 lnh;
+
+		if (ps_done(&mdata, rhf, rcd))
+			break;
+
+		if (ps_skip(&mdata, rhf, rcd))
+			goto next;
+
+		if (etype > RHF_RCV_TYPE_IB)
+			goto next;
+
+		packet.hdr = hfi1_get_msgheader(rcd, rhf_addr);
+		hdr = packet.hdr;
+
+		lnh = be16_to_cpu(hdr->lrh[0]) & 3;
+
+		if (lnh == HFI1_LRH_BTH)
+			packet.ohdr = &hdr->u.oth;
+		else if (lnh == HFI1_LRH_GRH)
+			packet.ohdr = &hdr->u.l.oth;
+		else
+			goto next; /* just in case */
+
+		opcode = (be32_to_cpu(packet.ohdr->bth[0]) >> 24);
+		qpn = be32_to_cpu(packet.ohdr->bth[1]) & RVT_QPN_MASK;
+		psn = mask_psn(be32_to_cpu(packet.ohdr->bth[2]));
+
+		seq_printf(s, "\tEnt %u: opcode 0x%x, qpn 0x%x, psn 0x%x\n",
+			   mdata.ps_head, opcode, qpn, psn);
+next:
+		update_ps_mdata(&mdata, rcd);
+	}
+}
+
+const rhf_rcv_function_ptr normal_rhf_rcv_functions[] = {
+	[RHF_RCV_TYPE_EXPECTED] = kdeth_process_expected,
+	[RHF_RCV_TYPE_EAGER] = kdeth_process_eager,
+	[RHF_RCV_TYPE_IB] = process_receive_ib,
+	[RHF_RCV_TYPE_ERROR] = process_receive_error,
+	[RHF_RCV_TYPE_BYPASS] = process_receive_bypass,
+	[RHF_RCV_TYPE_INVALID5] = process_receive_invalid,
+	[RHF_RCV_TYPE_INVALID6] = process_receive_invalid,
+	[RHF_RCV_TYPE_INVALID7] = process_receive_invalid,
+};
+
+const rhf_rcv_function_ptr netdev_rhf_rcv_functions[] = {
+	[RHF_RCV_TYPE_EXPECTED] = process_receive_invalid,
+	[RHF_RCV_TYPE_EAGER] = process_receive_invalid,
+	[RHF_RCV_TYPE_IB] = hfi1_ipoib_ib_rcv,
+	[RHF_RCV_TYPE_ERROR] = process_receive_error,
+	[RHF_RCV_TYPE_BYPASS] = hfi1_vnic_bypass_rcv,
+	[RHF_RCV_TYPE_INVALID5] = process_receive_invalid,
+	[RHF_RCV_TYPE_INVALID6] = process_receive_invalid,
+	[RHF_RCV_TYPE_INVALID7] = process_receive_invalid,
+};