v4.19.13 snapshot.
diff --git a/drivers/infiniband/hw/hfi1/driver.c b/drivers/infiniband/hw/hfi1/driver.c
new file mode 100644
index 0000000..a41f855
--- /dev/null
+++ b/drivers/infiniband/hw/hfi1/driver.c
@@ -0,0 +1,1771 @@
+/*
+ * Copyright(c) 2015-2018 Intel Corporation.
+ *
+ * This file is provided under a dual BSD/GPLv2 license. When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * BSD LICENSE
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * - Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#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 "hfi.h"
+#include "trace.h"
+#include "qp.h"
+#include "sdma.h"
+#include "debugfs.h"
+#include "vnic.h"
+#include "fault.h"
+
+#undef pr_fmt
+#define pr_fmt(fmt) DRIVER_NAME ": " fmt
+
+/*
+ * The size has to be longer than this string, so we can append
+ * board/chip information to it in the initialization code.
+ */
+const char ib_hfi1_version[] = HFI1_DRIVER_VERSION "\n";
+
+DEFINE_SPINLOCK(hfi1_devs_lock);
+LIST_HEAD(hfi1_dev_list);
+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("Intel Omni-Path Architecture 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 flags;
+ int pidx, nunits_active = 0;
+
+ spin_lock_irqsave(&hfi1_devs_lock, flags);
+ list_for_each_entry(dd, &hfi1_dev_list, list) {
+ 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;
+ }
+ }
+ }
+ spin_unlock_irqrestore(&hfi1_devs_lock, 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_VCRC_ERR | 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 = rcd->rcvhdrqentsize; /* words */
+ packet->maxcnt = rcd->rcvhdrq_cnt * 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 = rcd->head;
+ 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
+};
+
+void hfi1_process_ecn_slowpath(struct rvt_qp *qp, struct hfi1_packet *pkt,
+ bool do_cnp)
+{
+ 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, bth1;
+ u16 pkey;
+ u32 rlid, slid, dlid = 0;
+ u8 hdr_type, sc, svc_type;
+ bool is_mcast = false;
+
+ /* can be called from prescan */
+ if (pkt->etype == RHF_RCV_TYPE_BYPASS) {
+ is_mcast = hfi1_is_16B_mcast(dlid);
+ 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);
+ hdr_type = HFI1_PKT_TYPE_16B;
+ } else {
+ is_mcast = (dlid > be16_to_cpu(IB_MULTICAST_LID_BASE)) &&
+ (dlid != be16_to_cpu(IB_LID_PERMISSIVE));
+ pkey = ib_bth_get_pkey(ohdr);
+ sc = hfi1_9B_get_sc5(pkt->hdr, pkt->rhf);
+ dlid = ib_get_dlid(pkt->hdr);
+ slid = ib_get_slid(pkt->hdr);
+ hdr_type = HFI1_PKT_TYPE_9B;
+ }
+
+ switch (qp->ibqp.qp_type) {
+ case IB_QPT_UD:
+ dlid = ppd->lid;
+ 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;
+ }
+
+ bth1 = be32_to_cpu(ohdr->bth[1]);
+ /* Call appropriate CNP handler */
+ if (do_cnp && (bth1 & IB_FECN_SMASK))
+ hfi1_handle_cnp_tbl[hdr_type](ibp, qp, rqpn, pkey,
+ dlid, rlid, sc, grh);
+
+ if (!is_mcast && (bth1 & IB_BECN_SMASK)) {
+ u32 lqpn = bth1 & RVT_QPN_MASK;
+ u8 sl = ibp->sc_to_sl[sc];
+
+ process_becn(ppd, sl, rlid, lqpn, rqpn, svc_type);
+ }
+
+}
+
+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 (HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL)) {
+ mdata->ps_tail = get_rcvhdrtail(rcd);
+ if (rcd->ctxt == HFI1_CTRL_CTXT)
+ mdata->ps_seq = rcd->seq_cnt;
+ else
+ mdata->ps_seq = 0; /* not used with DMA_RTAIL */
+ } else {
+ mdata->ps_tail = 0; /* used only with DMA_RTAIL*/
+ mdata->ps_seq = rcd->seq_cnt;
+ }
+}
+
+static inline int ps_done(struct ps_mdata *mdata, u64 rhf,
+ struct hfi1_ctxtdata *rcd)
+{
+ if (HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL))
+ 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 (!HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL) ||
+ (rcd->ctxt == HFI1_CTRL_CTXT)) {
+ if (++mdata->ps_seq > 13)
+ mdata->ps_seq = 1;
+ }
+}
+
+/*
+ * 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;
+ int is_ecn = 0;
+ 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 */
+ }
+
+ bth1 = be32_to_cpu(packet->ohdr->bth[1]);
+ is_ecn = !!(bth1 & (IB_FECN_SMASK | IB_BECN_SMASK));
+
+ if (!is_ecn)
+ goto next;
+
+ qpn = bth1 & RVT_QPN_MASK;
+ rcu_read_lock();
+ qp = rvt_lookup_qpn(rdi, &ibp->rvp, qpn);
+
+ if (!qp) {
+ rcu_read_unlock();
+ goto next;
+ }
+
+ process_ecn(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;
+
+ /* 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 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 - ((packet->rcd->rcvhdrqentsize -
+ (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, packet->rcd->head, packet->updegr,
+ packet->etail, rcv_intr_dynamic, packet->numpkt);
+}
+
+/*
+ * Handle receive interrupts when using the no dma rtail option.
+ */
+int handle_receive_interrupt_nodma_rtail(struct hfi1_ctxtdata *rcd, int thread)
+{
+ u32 seq;
+ int last = RCV_PKT_OK;
+ struct hfi1_packet packet;
+
+ init_packet(rcd, &packet);
+ seq = rhf_rcv_seq(packet.rhf);
+ if (seq != rcd->seq_cnt) {
+ last = RCV_PKT_DONE;
+ goto bail;
+ }
+
+ prescan_rxq(rcd, &packet);
+
+ while (last == RCV_PKT_OK) {
+ last = process_rcv_packet(&packet, thread);
+ seq = rhf_rcv_seq(packet.rhf);
+ if (++rcd->seq_cnt > 13)
+ rcd->seq_cnt = 1;
+ if (seq != rcd->seq_cnt)
+ last = RCV_PKT_DONE;
+ process_rcv_update(last, &packet);
+ }
+ process_rcv_qp_work(&packet);
+ rcd->head = 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);
+ rcd->head = packet.rhqoff;
+bail:
+ finish_packet(&packet);
+ return last;
+}
+
+static inline void set_nodma_rtail(struct hfi1_devdata *dd, u16 ctxt)
+{
+ 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 (ctxt >= dd->first_dyn_alloc_ctxt) {
+ rcd = hfi1_rcd_get_by_index_safe(dd, ctxt);
+ if (rcd) {
+ rcd->do_interrupt =
+ &handle_receive_interrupt_nodma_rtail;
+ hfi1_rcd_put(rcd);
+ }
+ return;
+ }
+
+ for (i = HFI1_CTRL_CTXT + 1; i < dd->first_dyn_alloc_ctxt; i++) {
+ rcd = hfi1_rcd_get_by_index(dd, i);
+ if (rcd)
+ rcd->do_interrupt =
+ &handle_receive_interrupt_nodma_rtail;
+ hfi1_rcd_put(rcd);
+ }
+}
+
+static inline void set_dma_rtail(struct hfi1_devdata *dd, u16 ctxt)
+{
+ 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 (ctxt >= dd->first_dyn_alloc_ctxt) {
+ rcd = hfi1_rcd_get_by_index_safe(dd, ctxt);
+ if (rcd) {
+ rcd->do_interrupt =
+ &handle_receive_interrupt_dma_rtail;
+ hfi1_rcd_put(rcd);
+ }
+ return;
+ }
+
+ for (i = HFI1_CTRL_CTXT + 1; i < dd->first_dyn_alloc_ctxt; i++) {
+ rcd = hfi1_rcd_get_by_index(dd, i);
+ if (rcd)
+ rcd->do_interrupt =
+ &handle_receive_interrupt_dma_rtail;
+ 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 = &handle_receive_interrupt;
+
+ hfi1_rcd_put(rcd);
+ }
+}
+
+static inline int set_armed_to_active(struct hfi1_ctxtdata *rcd,
+ struct hfi1_packet *packet,
+ struct hfi1_devdata *dd)
+{
+ struct work_struct *lsaw = &rcd->ppd->linkstate_active_work;
+ 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(rcd->ppd);
+
+ if (hwstate != IB_PORT_ACTIVE) {
+ dd_dev_info(dd,
+ "Unexpected link state %s\n",
+ opa_lstate_name(hwstate));
+ return 0;
+ }
+
+ queue_work(rcd->ppd->link_wq, lsaw);
+ return 1;
+ }
+ return 0;
+}
+
+/*
+ * 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;
+
+ /* Control context will always use the slow path interrupt handler */
+ needset = (rcd->ctxt == HFI1_CTRL_CTXT) ? 0 : 1;
+
+ init_packet(rcd, &packet);
+
+ if (!HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL)) {
+ u32 seq = rhf_rcv_seq(packet.rhf);
+
+ if (seq != rcd->seq_cnt) {
+ 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) {
+ u32 seq = rhf_rcv_seq(packet.rhf);
+
+ if (seq != rcd->seq_cnt)
+ skip_pkt = 1;
+ }
+ }
+
+ prescan_rxq(rcd, &packet);
+
+ while (last == RCV_PKT_OK) {
+ if (unlikely(dd->do_drop &&
+ atomic_xchg(&dd->drop_packet, DROP_PACKET_OFF) ==
+ DROP_PACKET_ON)) {
+ dd->do_drop = 0;
+
+ /* 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 {
+ /* Auto activate link on non-SC15 packet receive */
+ if (unlikely(rcd->ppd->host_link_state ==
+ HLS_UP_ARMED) &&
+ set_armed_to_active(rcd, &packet, dd))
+ goto bail;
+ last = process_rcv_packet(&packet, thread);
+ }
+
+ if (!HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL)) {
+ u32 seq = rhf_rcv_seq(packet.rhf);
+
+ if (++rcd->seq_cnt > 13)
+ rcd->seq_cnt = 1;
+ if (seq != rcd->seq_cnt)
+ last = RCV_PKT_DONE;
+ if (needset) {
+ dd_dev_info(dd, "Switching to NO_DMA_RTAIL\n");
+ set_nodma_rtail(dd, rcd->ctxt);
+ needset = 0;
+ }
+ } 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) {
+ u32 seq = rhf_rcv_seq(packet.rhf);
+
+ if (++rcd->seq_cnt > 13)
+ rcd->seq_cnt = 1;
+ if (!last && (seq != rcd->seq_cnt))
+ skip_pkt = 1;
+ }
+
+ if (needset) {
+ dd_dev_info(dd,
+ "Switching to DMA_RTAIL\n");
+ set_dma_rtail(dd, rcd->ctxt);
+ needset = 0;
+ }
+ }
+
+ process_rcv_update(last, &packet);
+ }
+
+ process_rcv_qp_work(&packet);
+ rcd->head = packet.rhqoff;
+
+bail:
+ /*
+ * Always write head at end, and setup rcv interrupt, even
+ * if no packets were processed.
+ */
+ finish_packet(&packet);
+ return last;
+}
+
+/*
+ * 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 != 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;
+}
+
+void handle_eflags(struct hfi1_packet *packet)
+{
+ struct hfi1_ctxtdata *rcd = packet->rcd;
+ u32 rte = rhf_rcv_type_err(packet->rhf);
+
+ rcv_hdrerr(rcd, rcd->ppd, packet);
+ if (rhf_err_flags(packet->rhf))
+ dd_dev_err(rcd->dd,
+ "receive context %d: rhf 0x%016llx, errs [ %s%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_VCRC_ERR ? "vcrc " : "",
+ packet->rhf & RHF_ICRC_ERR ? "icrc " : "",
+ rte);
+}
+
+/*
+ * The following functions are called by the interrupt handler. They are type
+ * specific handlers for each packet type.
+ */
+static int process_receive_ib(struct hfi1_packet *packet)
+{
+ if (hfi1_setup_9B_packet(packet))
+ return RHF_RCV_CONTINUE;
+
+ if (unlikely(hfi1_dbg_should_fault_rx(packet)))
+ return RHF_RCV_CONTINUE;
+
+ trace_hfi1_rcvhdr(packet);
+
+ if (unlikely(rhf_err_flags(packet->rhf))) {
+ handle_eflags(packet);
+ return RHF_RCV_CONTINUE;
+ }
+
+ hfi1_ib_rcv(packet);
+ return RHF_RCV_CONTINUE;
+}
+
+static inline bool hfi1_is_vnic_packet(struct hfi1_packet *packet)
+{
+ /* Packet received in VNIC context via RSM */
+ if (packet->rcd->is_vnic)
+ return true;
+
+ if ((hfi1_16B_get_l2(packet->ebuf) == OPA_16B_L2_TYPE) &&
+ (hfi1_16B_get_l4(packet->ebuf) == OPA_16B_L4_ETHR))
+ return true;
+
+ return false;
+}
+
+static int process_receive_bypass(struct hfi1_packet *packet)
+{
+ struct hfi1_devdata *dd = packet->rcd->dd;
+
+ if (hfi1_is_vnic_packet(packet)) {
+ hfi1_vnic_bypass_rcv(packet);
+ return RHF_RCV_CONTINUE;
+ }
+
+ if (hfi1_setup_bypass_packet(packet))
+ return RHF_RCV_CONTINUE;
+
+ trace_hfi1_rcvhdr(packet);
+
+ if (unlikely(rhf_err_flags(packet->rhf))) {
+ handle_eflags(packet);
+ return RHF_RCV_CONTINUE;
+ }
+
+ 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);
+ }
+ }
+ return RHF_RCV_CONTINUE;
+}
+
+static int 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 RHF_RCV_CONTINUE;
+
+ 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");
+
+ return RHF_RCV_CONTINUE;
+}
+
+static int kdeth_process_expected(struct hfi1_packet *packet)
+{
+ hfi1_setup_9B_packet(packet);
+ if (unlikely(hfi1_dbg_should_fault_rx(packet)))
+ return RHF_RCV_CONTINUE;
+
+ if (unlikely(rhf_err_flags(packet->rhf)))
+ handle_eflags(packet);
+
+ dd_dev_err(packet->rcd->dd,
+ "Unhandled expected packet received. Dropping.\n");
+ return RHF_RCV_CONTINUE;
+}
+
+static int kdeth_process_eager(struct hfi1_packet *packet)
+{
+ hfi1_setup_9B_packet(packet);
+ if (unlikely(hfi1_dbg_should_fault_rx(packet)))
+ return RHF_RCV_CONTINUE;
+ if (unlikely(rhf_err_flags(packet->rhf)))
+ handle_eflags(packet);
+
+ dd_dev_err(packet->rcd->dd,
+ "Unhandled eager packet received. Dropping.\n");
+ return RHF_RCV_CONTINUE;
+}
+
+static int process_receive_invalid(struct hfi1_packet *packet)
+{
+ dd_dev_err(packet->rcd->dd, "Invalid packet type %d. Dropping\n",
+ rhf_rcv_type(packet->rhf));
+ return RHF_RCV_CONTINUE;
+}
+
+void seqfile_dump_rcd(struct seq_file *s, struct hfi1_ctxtdata *rcd)
+{
+ struct hfi1_packet packet;
+ struct ps_mdata mdata;
+
+ seq_printf(s, "Rcd %u: RcvHdr cnt %u entsize %u %s head %llu tail %llu\n",
+ rcd->ctxt, rcd->rcvhdrq_cnt, rcd->rcvhdrqentsize,
+ HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL) ?
+ "dma_rtail" : "nodma_rtail",
+ 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));
+
+ init_packet(rcd, &packet);
+ init_ps_mdata(&mdata, &packet);
+
+ while (1) {
+ __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,
+};