[PATCH 25/41] IB/hfi1: add qp handling

Mike Marciniszyn
2015-06-11T23:10:43Z

drivers/infiniband/hw/hfi1/qp.c | 1692 +++++++++++++++++++++++++++++++++++++++
drivers/infiniband/hw/hfi1/qp.h | 206 +++++
2 files changed, 1898 insertions(+)
create mode 100644 drivers/infiniband/hw/hfi1/qp.c
create mode 100644 drivers/infiniband/hw/hfi1/qp.h

diff --git a/drivers/infiniband/hw/hfi1/qp.c b/drivers/infiniband/hw/hfi1/qp.c
new file mode 100644
index 0000000..40db5d7
--- /dev/null
+++ b/drivers/infiniband/hw/hfi1/qp.c
@@ -0,0 +1,1692 @@
+/*
+ *
+ * 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
+ *
+ * Copyright(c) 2015 Intel Corporation.
+ *
+ * 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
+ *
+ * Copyright(c) 2015 Intel Corporation.
+ *
+ * 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/err.h>
+#include <linux/vmalloc.h>
+#include <linux/jhash.h>
+#include <linux/module.h>
+#include <linux/random.h>
+#include <linux/seq_file.h>
+
+#include "hfi.h"
+#include "qp.h"
+#include "trace.h"
+#include "sdma.h"
+
+#define BITS_PER_PAGE (PAGE_SIZE*BITS_PER_BYTE)
+#define BITS_PER_PAGE_MASK (BITS_PER_PAGE-1)
+
+static unsigned int hfi1_qp_table_size = 256;
+module_param_named(qp_table_size, hfi1_qp_table_size, uint, S_IRUGO);
+MODULE_PARM_DESC(qp_table_size, "QP table size");
+
+static void flush_tx_list(struct hfi1_qp *qp);
+static int iowait_sleep(
+ struct sdma_engine *sde,
+ struct iowait *wait,
+ struct sdma_txreq *stx,
+ unsigned seq);
+static void iowait_wakeup(struct iowait *wait, int reason);
+
+static inline unsigned mk_qpn(struct hfi1_qpn_table *qpt,
+ struct qpn_map *map, unsigned off)
+{
+ return (map - qpt->map) * BITS_PER_PAGE + off;
+}
+
+/*
+ * Convert the AETH credit code into the number of credits.
+ */
+static u32 credit_table[31] = {
+ 0, /* 0 */
+ 1, /* 1 */
+ 2, /* 2 */
+ 3, /* 3 */
+ 4, /* 4 */
+ 6, /* 5 */
+ 8, /* 6 */
+ 12, /* 7 */
+ 16, /* 8 */
+ 24, /* 9 */
+ 32, /* A */
+ 48, /* B */
+ 64, /* C */
+ 96, /* D */
+ 128, /* E */
+ 192, /* F */
+ 256, /* 10 */
+ 384, /* 11 */
+ 512, /* 12 */
+ 768, /* 13 */
+ 1024, /* 14 */
+ 1536, /* 15 */
+ 2048, /* 16 */
+ 3072, /* 17 */
+ 4096, /* 18 */
+ 6144, /* 19 */
+ 8192, /* 1A */
+ 12288, /* 1B */
+ 16384, /* 1C */
+ 24576, /* 1D */
+ 32768 /* 1E */
+};
+
+static void get_map_page(struct hfi1_qpn_table *qpt, struct qpn_map *map)
+{
+ unsigned long page = get_zeroed_page(GFP_KERNEL);
+
+ /*
+ * Free the page if someone raced with us installing it.
+ */
+
+ spin_lock(&qpt->lock);
+ if (map->page)
+ free_page(page);
+ else
+ map->page = (void *)page;
+ spin_unlock(&qpt->lock);
+}
+
+/*
+ * Allocate the next available QPN or
+ * zero/one for QP type IB_QPT_SMI/IB_QPT_GSI.
+ */
+static int alloc_qpn(struct hfi1_devdata *dd, struct hfi1_qpn_table *qpt,
+ enum ib_qp_type type, u8 port)
+{
+ u32 i, offset, max_scan, qpn;
+ struct qpn_map *map;
+ u32 ret;
+
+ if (type == IB_QPT_SMI || type == IB_QPT_GSI) {
+ unsigned n;
+
+ ret = type == IB_QPT_GSI;
+ n = 1 << (ret + 2 * (port - 1));
+ spin_lock(&qpt->lock);
+ if (qpt->flags & n)
+ ret = -EINVAL;
+ else
+ qpt->flags |= n;
+ spin_unlock(&qpt->lock);
+ goto bail;
+ }
+
+ qpn = qpt->last + qpt->incr;
+ if (qpn >= QPN_MAX)
+ qpn = qpt->incr | ((qpt->last & 1) ^ 1);
+ /* offset carries bit 0 */
+ offset = qpn & BITS_PER_PAGE_MASK;
+ map = &qpt->map[qpn / BITS_PER_PAGE];
+ max_scan = qpt->nmaps - !offset;
+ for (i = 0;;) {
+ if (unlikely(!map->page)) {
+ get_map_page(qpt, map);
+ if (unlikely(!map->page))
+ break;
+ }
+ do {
+ if (!test_and_set_bit(offset, map->page)) {
+ qpt->last = qpn;
+ ret = qpn;
+ goto bail;
+ }
+ offset += qpt->incr;
+ /*
+ * This qpn might be bogus if offset >= BITS_PER_PAGE.
+ * That is OK. It gets re-assigned below
+ */
+ qpn = mk_qpn(qpt, map, offset);
+ } while (offset < BITS_PER_PAGE && qpn < QPN_MAX);
+ /*
+ * In order to keep the number of pages allocated to a
+ * minimum, we scan the all existing pages before increasing
+ * the size of the bitmap table.
+ */
+ if (++i > max_scan) {
+ if (qpt->nmaps == QPNMAP_ENTRIES)
+ break;
+ map = &qpt->map[qpt->nmaps++];
+ /* start at incr with current bit 0 */
+ offset = qpt->incr | (offset & 1);
+ } else if (map < &qpt->map[qpt->nmaps]) {
+ ++map;
+ /* start at incr with current bit 0 */
+ offset = qpt->incr | (offset & 1);
+ } else {
+ map = &qpt->map[0];
+ /* wrap to first map page, invert bit 0 */
+ offset = qpt->incr | ((offset & 1) ^ 1);
+ }
+ /* there can be no bits at shift and below */
+ BUG_ON(offset & (dd->qos_shift - 1));
+ qpn = mk_qpn(qpt, map, offset);
+ }
+
+ ret = -ENOMEM;
+
+bail:
+ return ret;
+}
+
+static void free_qpn(struct hfi1_qpn_table *qpt, u32 qpn)
+{
+ struct qpn_map *map;
+
+ map = qpt->map + qpn / BITS_PER_PAGE;
+ if (map->page)
+ clear_bit(qpn & BITS_PER_PAGE_MASK, map->page);
+}
+
+static inline unsigned qpn_hash(struct hfi1_qp_ibdev *dev, u32 qpn)
+{
+ return jhash_1word(qpn, dev->qp_rnd) &
+ (dev->qp_table_size - 1);
+}
+
+
+/*
+ * Put the QP into the hash table.
+ * The hash table holds a reference to the QP.
+ */
+static void insert_qp(struct hfi1_ibdev *dev, struct hfi1_qp *qp)
+{
+ struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
+ unsigned long flags;
+ unsigned n = qpn_hash(dev->qp_dev, qp->ibqp.qp_num);
+
+ atomic_inc(&qp->refcount);
+ spin_lock_irqsave(&dev->qp_dev->qpt_lock, flags);
+
+ if (qp->ibqp.qp_num == 0)
+ rcu_assign_pointer(ibp->qp0, qp);
+ else if (qp->ibqp.qp_num == 1)
+ rcu_assign_pointer(ibp->qp1, qp);
+ else {
+ qp->next = dev->qp_dev->qp_table[n];
+ rcu_assign_pointer(dev->qp_dev->qp_table[n], qp);
+ }
+
+ spin_unlock_irqrestore(&dev->qp_dev->qpt_lock, flags);
+}
+
+/*
+ * Remove the QP from the table so it can't be found asynchronously by
+ * the receive interrupt routine.
+ */
+static void remove_qp(struct hfi1_ibdev *dev, struct hfi1_qp *qp)
+{
+ struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
+ unsigned n = qpn_hash(dev->qp_dev, qp->ibqp.qp_num);
+ unsigned long flags;
+ int removed = 1;
+
+ spin_lock_irqsave(&dev->qp_dev->qpt_lock, flags);
+
+ if (rcu_dereference_protected(ibp->qp0,
+ lockdep_is_held(&dev->qp_dev->qpt_lock)) == qp) {
+ RCU_INIT_POINTER(ibp->qp0, NULL);
+ } else if (rcu_dereference_protected(ibp->qp1,
+ lockdep_is_held(&dev->qp_dev->qpt_lock)) == qp) {
+ RCU_INIT_POINTER(ibp->qp1, NULL);
+ } else {
+ struct hfi1_qp *q;
+ struct hfi1_qp __rcu **qpp;
+
+ removed = 0;
+ qpp = &dev->qp_dev->qp_table[n];
+ for (; (q = rcu_dereference_protected(*qpp,
+ lockdep_is_held(&dev->qp_dev->qpt_lock)))
+ != NULL;
+ qpp = &q->next)
+ if (q == qp) {
+ RCU_INIT_POINTER(*qpp,
+ rcu_dereference_protected(qp->next,
+ lockdep_is_held(&dev->qp_dev->qpt_lock)));
+ removed = 1;
+ break;
+ }
+ }
+
+ spin_unlock_irqrestore(&dev->qp_dev->qpt_lock, flags);
+ if (removed) {
+ synchronize_rcu();
+ if (atomic_dec_and_test(&qp->refcount))
+ wake_up(&qp->wait);
+ }
+}
+
+/**
+ * free_all_qps - check for QPs still in use
+ * @qpt: the QP table to empty
+ *
+ * There should not be any QPs still in use.
+ * Free memory for table.
+ */
+static unsigned free_all_qps(struct hfi1_devdata *dd)
+{
+ struct hfi1_ibdev *dev = &dd->verbs_dev;
+ unsigned long flags;
+ struct hfi1_qp *qp;
+ unsigned n, qp_inuse = 0;
+
+ for (n = 0; n < dd->num_pports; n++) {
+ struct hfi1_ibport *ibp = &dd->pport[n].ibport_data;
+
+ if (!hfi1_mcast_tree_empty(ibp))
+ qp_inuse++;
+ rcu_read_lock();
+ if (rcu_dereference(ibp->qp0))
+ qp_inuse++;
+ if (rcu_dereference(ibp->qp1))
+ qp_inuse++;
+ rcu_read_unlock();
+ }
+
+ if (!dev->qp_dev)
+ goto bail;
+ spin_lock_irqsave(&dev->qp_dev->qpt_lock, flags);
+ for (n = 0; n < dev->qp_dev->qp_table_size; n++) {
+ qp = rcu_dereference_protected(dev->qp_dev->qp_table[n],
+ lockdep_is_held(&dev->qp_dev->qpt_lock));
+ RCU_INIT_POINTER(dev->qp_dev->qp_table[n], NULL);
+
+ for (; qp; qp = rcu_dereference_protected(qp->next,
+ lockdep_is_held(&dev->qp_dev->qpt_lock)))
+ qp_inuse++;
+ }
+ spin_unlock_irqrestore(&dev->qp_dev->qpt_lock, flags);
+ synchronize_rcu();
+bail:
+ return qp_inuse;
+}
+
+/**
+ * hfi1_lookup_qpn - return the QP with the given QPN
+ * @qpt: the QP table
+ * @qpn: the QP number to look up
+ *
+ * The caller is responsible for decrementing the QP reference count
+ * when done.
+ */
+struct hfi1_qp *hfi1_lookup_qpn(struct hfi1_ibport *ibp, u32 qpn)
+{
+ struct hfi1_qp *qp = NULL;
+
+ rcu_read_lock();
+ if (unlikely(qpn <= 1)) {
+ if (qpn == 0)
+ qp = rcu_dereference(ibp->qp0);
+ else
+ qp = rcu_dereference(ibp->qp1);
+ if (qp)
+ atomic_inc(&qp->refcount);
+ } else {
+ struct hfi1_ibdev *dev = &ppd_from_ibp(ibp)->dd->verbs_dev;
+ unsigned n = qpn_hash(dev->qp_dev, qpn);
+
+ for (qp = rcu_dereference(dev->qp_dev->qp_table[n]); qp;
+ qp = rcu_dereference(qp->next))
+ if (qp->ibqp.qp_num == qpn) {
+ atomic_inc(&qp->refcount);
+ break;
+ }
+ }
+ rcu_read_unlock();
+ return qp;
+}
+
+/**
+ * reset_qp - initialize the QP state to the reset state
+ * @qp: the QP to reset
+ * @type: the QP type
+ */
+static void reset_qp(struct hfi1_qp *qp, enum ib_qp_type type)
+{
+ qp->remote_qpn = 0;
+ qp->qkey = 0;
+ qp->qp_access_flags = 0;
+ iowait_init(
+ &qp->s_iowait,
+ 1,
+ hfi1_do_send,
+ iowait_sleep,
+ iowait_wakeup);
+ qp->s_flags &= HFI1_S_SIGNAL_REQ_WR;
+ qp->s_hdrwords = 0;
+ qp->s_wqe = NULL;
+ qp->s_draining = 0;
+ qp->s_next_psn = 0;
+ qp->s_last_psn = 0;
+ qp->s_sending_psn = 0;
+ qp->s_sending_hpsn = 0;
+ qp->s_psn = 0;
+ qp->r_psn = 0;
+ qp->r_msn = 0;
+ if (type == IB_QPT_RC) {
+ qp->s_state = IB_OPCODE_RC_SEND_LAST;
+ qp->r_state = IB_OPCODE_RC_SEND_LAST;
+ } else {
+ qp->s_state = IB_OPCODE_UC_SEND_LAST;
+ qp->r_state = IB_OPCODE_UC_SEND_LAST;
+ }
+ qp->s_ack_state = IB_OPCODE_RC_ACKNOWLEDGE;
+ qp->r_nak_state = 0;
+ qp->r_aflags = 0;
+ qp->r_flags = 0;
+ qp->s_head = 0;
+ qp->s_tail = 0;
+ qp->s_cur = 0;
+ qp->s_acked = 0;
+ qp->s_last = 0;
+ qp->s_ssn = 1;
+ qp->s_lsn = 0;
+ clear_ahg(qp);
+ qp->s_mig_state = IB_MIG_MIGRATED;
+ memset(qp->s_ack_queue, 0, sizeof(qp->s_ack_queue));
+ qp->r_head_ack_queue = 0;
+ qp->s_tail_ack_queue = 0;
+ qp->s_num_rd_atomic = 0;
+ if (qp->r_rq.wq) {
+ qp->r_rq.wq->head = 0;
+ qp->r_rq.wq->tail = 0;
+ }
+ qp->r_sge.num_sge = 0;
+}
+
+static void clear_mr_refs(struct hfi1_qp *qp, int clr_sends)
+{
+ unsigned n;
+
+ if (test_and_clear_bit(HFI1_R_REWIND_SGE, &qp->r_aflags))
+ hfi1_put_ss(&qp->s_rdma_read_sge);
+
+ hfi1_put_ss(&qp->r_sge);
+
+ if (clr_sends) {
+ while (qp->s_last != qp->s_head) {
+ struct hfi1_swqe *wqe = get_swqe_ptr(qp, qp->s_last);
+ unsigned i;
+
+ for (i = 0; i < wqe->wr.num_sge; i++) {
+ struct hfi1_sge *sge = &wqe->sg_list[i];
+
+ hfi1_put_mr(sge->mr);
+ }
+ if (qp->ibqp.qp_type == IB_QPT_UD ||
+ qp->ibqp.qp_type == IB_QPT_SMI ||
+ qp->ibqp.qp_type == IB_QPT_GSI)
+ atomic_dec(&to_iah(wqe->wr.wr.ud.ah)->refcount);
+ if (++qp->s_last >= qp->s_size)
+ qp->s_last = 0;
+ }
+ if (qp->s_rdma_mr) {
+ hfi1_put_mr(qp->s_rdma_mr);
+ qp->s_rdma_mr = NULL;
+ }
+ }
+
+ if (qp->ibqp.qp_type != IB_QPT_RC)
+ return;
+
+ for (n = 0; n < ARRAY_SIZE(qp->s_ack_queue); n++) {
+ struct hfi1_ack_entry *e = &qp->s_ack_queue[n];
+
+ if (e->opcode == IB_OPCODE_RC_RDMA_READ_REQUEST &&
+ e->rdma_sge.mr) {
+ hfi1_put_mr(e->rdma_sge.mr);
+ e->rdma_sge.mr = NULL;
+ }
+ }
+}
+
+/**
+ * hfi1_error_qp - put a QP into the error state
+ * @qp: the QP to put into the error state
+ * @err: the receive completion error to signal if a RWQE is active
+ *
+ * Flushes both send and receive work queues.
+ * Returns true if last WQE event should be generated.
+ * The QP r_lock and s_lock should be held and interrupts disabled.
+ * If we are already in error state, just return.
+ */
+int hfi1_error_qp(struct hfi1_qp *qp, enum ib_wc_status err)
+{
+ struct hfi1_ibdev *dev = to_idev(qp->ibqp.device);
+ struct ib_wc wc;
+ int ret = 0;
+
+ if (qp->state == IB_QPS_ERR || qp->state == IB_QPS_RESET)
+ goto bail;
+
+ qp->state = IB_QPS_ERR;
+
+ if (qp->s_flags & (HFI1_S_TIMER | HFI1_S_WAIT_RNR)) {
+ qp->s_flags &= ~(HFI1_S_TIMER | HFI1_S_WAIT_RNR);
+ del_timer(&qp->s_timer);
+ }
+
+ if (qp->s_flags & HFI1_S_ANY_WAIT_SEND)
+ qp->s_flags &= ~HFI1_S_ANY_WAIT_SEND;
+
+ spin_lock(&dev->pending_lock);
+ if (!list_empty(&qp->s_iowait.list) && !(qp->s_flags & HFI1_S_BUSY)) {
+ qp->s_flags &= ~HFI1_S_ANY_WAIT_IO;
+ list_del_init(&qp->s_iowait.list);
+ if (atomic_dec_and_test(&qp->refcount))
+ wake_up(&qp->wait);
+ }
+ spin_unlock(&dev->pending_lock);
+
+ if (!(qp->s_flags & HFI1_S_BUSY)) {
+ qp->s_hdrwords = 0;
+ if (qp->s_rdma_mr) {
+ hfi1_put_mr(qp->s_rdma_mr);
+ qp->s_rdma_mr = NULL;
+ }
+ flush_tx_list(qp);
+ }
+
+ /* Schedule the sending tasklet to drain the send work queue. */
+ if (qp->s_last != qp->s_head)
+ hfi1_schedule_send(qp);
+
+ clear_mr_refs(qp, 0);
+
+ memset(&wc, 0, sizeof(wc));
+ wc.qp = &qp->ibqp;
+ wc.opcode = IB_WC_RECV;
+
+ if (test_and_clear_bit(HFI1_R_WRID_VALID, &qp->r_aflags)) {
+ wc.wr_id = qp->r_wr_id;
+ wc.status = err;
+ hfi1_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1);
+ }
+ wc.status = IB_WC_WR_FLUSH_ERR;
+
+ if (qp->r_rq.wq) {
+ struct hfi1_rwq *wq;
+ u32 head;
+ u32 tail;
+
+ spin_lock(&qp->r_rq.lock);
+
+ /* sanity check pointers before trusting them */
+ wq = qp->r_rq.wq;
+ head = wq->head;
+ if (head >= qp->r_rq.size)
+ head = 0;
+ tail = wq->tail;
+ if (tail >= qp->r_rq.size)
+ tail = 0;
+ while (tail != head) {
+ wc.wr_id = get_rwqe_ptr(&qp->r_rq, tail)->wr_id;
+ if (++tail >= qp->r_rq.size)
+ tail = 0;
+ hfi1_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1);
+ }
+ wq->tail = tail;
+
+ spin_unlock(&qp->r_rq.lock);
+ } else if (qp->ibqp.event_handler)
+ ret = 1;
+
+bail:
+ return ret;
+}
+
+static void flush_tx_list(struct hfi1_qp *qp)
+{
+ while (!list_empty(&qp->s_iowait.tx_head)) {
+ struct sdma_txreq *tx;
+
+ tx = list_first_entry(
+ &qp->s_iowait.tx_head,
+ struct sdma_txreq,
+ list);
+ list_del_init(&tx->list);
+ hfi1_put_txreq(
+ container_of(tx, struct verbs_txreq, txreq));
+ }
+}
+
+static void flush_iowait(struct hfi1_qp *qp)
+{
+ struct hfi1_ibdev *dev = to_idev(qp->ibqp.device);
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev->pending_lock, flags);
+ if (!list_empty(&qp->s_iowait.list)) {
+ list_del_init(&qp->s_iowait.list);
+ if (atomic_dec_and_test(&qp->refcount))
+ wake_up(&qp->wait);
+ }
+ spin_unlock_irqrestore(&dev->pending_lock, flags);
+}
+
+static inline int opa_mtu_enum_to_int(int mtu)
+{
+ switch (mtu) {
+ case OPA_MTU_8192: return 8192;
+ case OPA_MTU_10240: return 10240;
+ default: return -1;
+ }
+}
+
+/**
+ * This function is what we would push to the core layer if we wanted to be a
+ * "first class citizen". Instead we hide this here and rely on Verbs ULPs
+ * to blindly pass the MTU enum value from the PathRecord to us.
+ *
+ * The actual flag used to determine "8k MTU" will change and is currently
+ * unknown.
+ */
+static inline int verbs_mtu_enum_to_int(struct ib_device *dev, enum ib_mtu mtu)
+{
+ int val = opa_mtu_enum_to_int((int)mtu);
+
+ if (val > 0)
+ return val;
+ return ib_mtu_enum_to_int(mtu);
+}
+
+
+/**
+ * hfi1_modify_qp - modify the attributes of a queue pair
+ * @ibqp: the queue pair who's attributes we're modifying
+ * @attr: the new attributes
+ * @attr_mask: the mask of attributes to modify
+ * @udata: user data for libibverbs.so
+ *
+ * Returns 0 on success, otherwise returns an errno.
+ */
+int hfi1_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
+ int attr_mask, struct ib_udata *udata)
+{
+ struct hfi1_ibdev *dev = to_idev(ibqp->device);
+ struct hfi1_qp *qp = to_iqp(ibqp);
+ enum ib_qp_state cur_state, new_state;
+ struct ib_event ev;
+ int lastwqe = 0;
+ int mig = 0;
+ int ret;
+ u32 pmtu = 0; /* for gcc warning only */
+ struct hfi1_devdata *dd;
+
+ spin_lock_irq(&qp->r_lock);
+ spin_lock(&qp->s_lock);
+
+ cur_state = attr_mask & IB_QP_CUR_STATE ?
+ attr->cur_qp_state : qp->state;
+ new_state = attr_mask & IB_QP_STATE ? attr->qp_state : cur_state;
+
+ if (!ib_modify_qp_is_ok(cur_state, new_state, ibqp->qp_type,
+ attr_mask, IB_LINK_LAYER_UNSPECIFIED))
+ goto inval;
+
+ if (attr_mask & IB_QP_AV) {
+ if (attr->ah_attr.dlid >= HFI1_MULTICAST_LID_BASE)
+ goto inval;
+ if (hfi1_check_ah(qp->ibqp.device, &attr->ah_attr))
+ goto inval;
+ }
+
+ if (attr_mask & IB_QP_ALT_PATH) {
+ if (attr->alt_ah_attr.dlid >= HFI1_MULTICAST_LID_BASE)
+ goto inval;
+ if (hfi1_check_ah(qp->ibqp.device, &attr->alt_ah_attr))
+ goto inval;
+ if (attr->alt_pkey_index >= hfi1_get_npkeys(dd_from_dev(dev)))
+ goto inval;
+ }
+
+ if (attr_mask & IB_QP_PKEY_INDEX)
+ if (attr->pkey_index >= hfi1_get_npkeys(dd_from_dev(dev)))
+ goto inval;
+
+ if (attr_mask & IB_QP_MIN_RNR_TIMER)
+ if (attr->min_rnr_timer > 31)
+ goto inval;
+
+ if (attr_mask & IB_QP_PORT)
+ if (qp->ibqp.qp_type == IB_QPT_SMI ||
+ qp->ibqp.qp_type == IB_QPT_GSI ||
+ attr->port_num == 0 ||
+ attr->port_num > ibqp->device->phys_port_cnt)
+ goto inval;
+
+ if (attr_mask & IB_QP_DEST_QPN)
+ if (attr->dest_qp_num > HFI1_QPN_MASK)
+ goto inval;
+
+ if (attr_mask & IB_QP_RETRY_CNT)
+ if (attr->retry_cnt > 7)
+ goto inval;
+
+ if (attr_mask & IB_QP_RNR_RETRY)
+ if (attr->rnr_retry > 7)
+ goto inval;
+
+ /*
+ * Don't allow invalid path_mtu values. OK to set greater
+ * than the active mtu (or even the max_cap, if we have tuned
+ * that to a small mtu. We'll set qp->path_mtu
+ * to the lesser of requested attribute mtu and active,
+ * for packetizing messages.
+ * Note that the QP port has to be set in INIT and MTU in RTR.
+ */
+ if (attr_mask & IB_QP_PATH_MTU) {
+ int mtu, pidx = qp->port_num - 1;
+
+ dd = dd_from_dev(dev);
+ mtu = verbs_mtu_enum_to_int(ibqp->device, attr->path_mtu);
+ if (mtu == -1)
+ goto inval;
+
+ if (mtu > dd->pport[pidx].ibmtu)
+ pmtu = mtu_to_enum(dd->pport[pidx].ibmtu, IB_MTU_2048);
+ else
+ pmtu = attr->path_mtu;
+ }
+
+ if (attr_mask & IB_QP_PATH_MIG_STATE) {
+ if (attr->path_mig_state == IB_MIG_REARM) {
+ if (qp->s_mig_state == IB_MIG_ARMED)
+ goto inval;
+ if (new_state != IB_QPS_RTS)
+ goto inval;
+ } else if (attr->path_mig_state == IB_MIG_MIGRATED) {
+ if (qp->s_mig_state == IB_MIG_REARM)
+ goto inval;
+ if (new_state != IB_QPS_RTS && new_state != IB_QPS_SQD)
+ goto inval;
+ if (qp->s_mig_state == IB_MIG_ARMED)
+ mig = 1;
+ } else
+ goto inval;
+ }
+
+ if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
+ if (attr->max_dest_rd_atomic > HFI1_MAX_RDMA_ATOMIC)
+ goto inval;
+
+ switch (new_state) {
+ case IB_QPS_RESET:
+ if (qp->state != IB_QPS_RESET) {
+ qp->state = IB_QPS_RESET;
+ flush_iowait(qp);
+ qp->s_flags &= ~(HFI1_S_TIMER | HFI1_S_ANY_WAIT);
+ spin_unlock(&qp->s_lock);
+ spin_unlock_irq(&qp->r_lock);
+ /* Stop the sending work queue and retry timer */
+ cancel_work_sync(&qp->s_iowait.iowork);
+ del_timer_sync(&qp->s_timer);
+ iowait_sdma_drain(&qp->s_iowait);
+ flush_tx_list(qp);
+ remove_qp(dev, qp);
+ wait_event(qp->wait, !atomic_read(&qp->refcount));
+ spin_lock_irq(&qp->r_lock);
+ spin_lock(&qp->s_lock);
+ clear_mr_refs(qp, 1);
+ clear_ahg(qp);
+ reset_qp(qp, ibqp->qp_type);
+ }
+ break;
+
+ case IB_QPS_RTR:
+ /* Allow event to re-trigger if QP set to RTR more than once */
+ qp->r_flags &= ~HFI1_R_COMM_EST;
+ qp->state = new_state;
+ break;
+
+ case IB_QPS_SQD:
+ qp->s_draining = qp->s_last != qp->s_cur;
+ qp->state = new_state;
+ break;
+
+ case IB_QPS_SQE:
+ if (qp->ibqp.qp_type == IB_QPT_RC)
+ goto inval;
+ qp->state = new_state;
+ break;
+
+ case IB_QPS_ERR:
+ lastwqe = hfi1_error_qp(qp, IB_WC_WR_FLUSH_ERR);
+ break;
+
+ default:
+ qp->state = new_state;
+ break;
+ }
+
+ if (attr_mask & IB_QP_PKEY_INDEX)
+ qp->s_pkey_index = attr->pkey_index;
+
+ if (attr_mask & IB_QP_PORT)
+ qp->port_num = attr->port_num;
+
+ if (attr_mask & IB_QP_DEST_QPN)
+ qp->remote_qpn = attr->dest_qp_num;
+
+ if (attr_mask & IB_QP_SQ_PSN) {
+ qp->s_next_psn = attr->sq_psn & PSN_MODIFY_MASK;
+ qp->s_psn = qp->s_next_psn;
+ qp->s_sending_psn = qp->s_next_psn;
+ qp->s_last_psn = qp->s_next_psn - 1;
+ qp->s_sending_hpsn = qp->s_last_psn;
+ }
+
+ if (attr_mask & IB_QP_RQ_PSN)
+ qp->r_psn = attr->rq_psn & PSN_MODIFY_MASK;
+
+ if (attr_mask & IB_QP_ACCESS_FLAGS)
+ qp->qp_access_flags = attr->qp_access_flags;
+
+ if (attr_mask & IB_QP_AV) {
+ qp->remote_ah_attr = attr->ah_attr;
+ qp->s_srate = attr->ah_attr.static_rate;
+ qp->srate_mbps = ib_rate_to_mbps(qp->s_srate);
+ }
+
+ if (attr_mask & IB_QP_ALT_PATH) {
+ qp->alt_ah_attr = attr->alt_ah_attr;
+ qp->s_alt_pkey_index = attr->alt_pkey_index;
+ }
+
+ if (attr_mask & IB_QP_PATH_MIG_STATE) {
+ qp->s_mig_state = attr->path_mig_state;
+ if (mig) {
+ qp->remote_ah_attr = qp->alt_ah_attr;
+ qp->port_num = qp->alt_ah_attr.port_num;
+ qp->s_pkey_index = qp->s_alt_pkey_index;
+ qp->s_flags |= HFI1_S_AHG_CLEAR;
+ }
+ }
+
+ if (attr_mask & IB_QP_PATH_MTU) {
+ struct hfi1_ibport *ibp;
+ u8 sc, vl;
+ u32 mtu;
+
+ dd = dd_from_dev(dev);
+ ibp = &dd->pport[qp->port_num - 1].ibport_data;
+
+ sc = ibp->sl_to_sc[qp->remote_ah_attr.sl];
+ vl = sc_to_vlt(dd, sc);
+
+ mtu = verbs_mtu_enum_to_int(ibqp->device, pmtu);
+ if (vl < PER_VL_SEND_CONTEXTS)
+ mtu = min_t(u32, mtu, dd->vld[vl].mtu);
+ pmtu = mtu_to_enum(mtu, OPA_MTU_8192);
+
+ qp->path_mtu = pmtu;
+ qp->pmtu = mtu;
+ }
+
+ if (attr_mask & IB_QP_RETRY_CNT) {
+ qp->s_retry_cnt = attr->retry_cnt;
+ qp->s_retry = attr->retry_cnt;
+ }
+
+ if (attr_mask & IB_QP_RNR_RETRY) {
+ qp->s_rnr_retry_cnt = attr->rnr_retry;
+ qp->s_rnr_retry = attr->rnr_retry;
+ }
+
+ if (attr_mask & IB_QP_MIN_RNR_TIMER)
+ qp->r_min_rnr_timer = attr->min_rnr_timer;
+
+ if (attr_mask & IB_QP_TIMEOUT) {
+ qp->timeout = attr->timeout;
+ qp->timeout_jiffies =
+ usecs_to_jiffies((4096UL * (1UL << qp->timeout)) /
+ 1000UL);
+ }
+
+ if (attr_mask & IB_QP_QKEY)
+ qp->qkey = attr->qkey;
+
+ if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
+ qp->r_max_rd_atomic = attr->max_dest_rd_atomic;
+
+ if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC)
+ qp->s_max_rd_atomic = attr->max_rd_atomic;
+
+ spin_unlock(&qp->s_lock);
+ spin_unlock_irq(&qp->r_lock);
+
+ if (cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
+ insert_qp(dev, qp);
+
+ if (lastwqe) {
+ ev.device = qp->ibqp.device;
+ ev.element.qp = &qp->ibqp;
+ ev.event = IB_EVENT_QP_LAST_WQE_REACHED;
+ qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
+ }
+ if (mig) {
+ ev.device = qp->ibqp.device;
+ ev.element.qp = &qp->ibqp;
+ ev.event = IB_EVENT_PATH_MIG;
+ qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
+ }
+ ret = 0;
+ goto bail;
+
+inval:
+ spin_unlock(&qp->s_lock);
+ spin_unlock_irq(&qp->r_lock);
+ ret = -EINVAL;
+
+bail:
+ return ret;
+}
+
+int hfi1_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
+ int attr_mask, struct ib_qp_init_attr *init_attr)
+{
+ struct hfi1_qp *qp = to_iqp(ibqp);
+
+ attr->qp_state = qp->state;
+ attr->cur_qp_state = attr->qp_state;
+ attr->path_mtu = qp->path_mtu;
+ attr->path_mig_state = qp->s_mig_state;
+ attr->qkey = qp->qkey;
+ attr->rq_psn = mask_psn(qp->r_psn);
+ attr->sq_psn = mask_psn(qp->s_next_psn);
+ attr->dest_qp_num = qp->remote_qpn;
+ attr->qp_access_flags = qp->qp_access_flags;
+ attr->cap.max_send_wr = qp->s_size - 1;
+ attr->cap.max_recv_wr = qp->ibqp.srq ? 0 : qp->r_rq.size - 1;
+ attr->cap.max_send_sge = qp->s_max_sge;
+ attr->cap.max_recv_sge = qp->r_rq.max_sge;
+ attr->cap.max_inline_data = 0;
+ attr->ah_attr = qp->remote_ah_attr;
+ attr->alt_ah_attr = qp->alt_ah_attr;
+ attr->pkey_index = qp->s_pkey_index;
+ attr->alt_pkey_index = qp->s_alt_pkey_index;
+ attr->en_sqd_async_notify = 0;
+ attr->sq_draining = qp->s_draining;
+ attr->max_rd_atomic = qp->s_max_rd_atomic;
+ attr->max_dest_rd_atomic = qp->r_max_rd_atomic;
+ attr->min_rnr_timer = qp->r_min_rnr_timer;
+ attr->port_num = qp->port_num;
+ attr->timeout = qp->timeout;
+ attr->retry_cnt = qp->s_retry_cnt;
+ attr->rnr_retry = qp->s_rnr_retry_cnt;
+ attr->alt_port_num = qp->alt_ah_attr.port_num;
+ attr->alt_timeout = qp->alt_timeout;
+
+ init_attr->event_handler = qp->ibqp.event_handler;
+ init_attr->qp_context = qp->ibqp.qp_context;
+ init_attr->send_cq = qp->ibqp.send_cq;
+ init_attr->recv_cq = qp->ibqp.recv_cq;
+ init_attr->srq = qp->ibqp.srq;
+ init_attr->cap = attr->cap;
+ if (qp->s_flags & HFI1_S_SIGNAL_REQ_WR)
+ init_attr->sq_sig_type = IB_SIGNAL_REQ_WR;
+ else
+ init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
+ init_attr->qp_type = qp->ibqp.qp_type;
+ init_attr->port_num = qp->port_num;
+ return 0;
+}
+
+/**
+ * hfi1_compute_aeth - compute the AETH (syndrome + MSN)
+ * @qp: the queue pair to compute the AETH for
+ *
+ * Returns the AETH.
+ */
+__be32 hfi1_compute_aeth(struct hfi1_qp *qp)
+{
+ u32 aeth = qp->r_msn & HFI1_MSN_MASK;
+
+ if (qp->ibqp.srq) {
+ /*
+ * Shared receive queues don't generate credits.
+ * Set the credit field to the invalid value.
+ */
+ aeth |= HFI1_AETH_CREDIT_INVAL << HFI1_AETH_CREDIT_SHIFT;
+ } else {
+ u32 min, max, x;
+ u32 credits;
+ struct hfi1_rwq *wq = qp->r_rq.wq;
+ u32 head;
+ u32 tail;
+
+ /* sanity check pointers before trusting them */
+ head = wq->head;
+ if (head >= qp->r_rq.size)
+ head = 0;
+ tail = wq->tail;
+ if (tail >= qp->r_rq.size)
+ tail = 0;
+ /*
+ * Compute the number of credits available (RWQEs).
+ * There is a small chance that the pair of reads are
+ * not atomic, which is OK, since the fuzziness is
+ * resolved as further ACKs go out.
+ */
+ credits = head - tail;
+ if ((int)credits < 0)
+ credits += qp->r_rq.size;
+ /*
+ * Binary search the credit table to find the code to
+ * use.
+ */
+ min = 0;
+ max = 31;
+ for (;;) {
+ x = (min + max) / 2;
+ if (credit_table[x] == credits)
+ break;
+ if (credit_table[x] > credits)
+ max = x;
+ else if (min == x)
+ break;
+ else
+ min = x;
+ }
+ aeth |= x << HFI1_AETH_CREDIT_SHIFT;
+ }
+ return cpu_to_be32(aeth);
+}
+
+/**
+ * hfi1_create_qp - create a queue pair for a device
+ * @ibpd: the protection domain who's device we create the queue pair for
+ * @init_attr: the attributes of the queue pair
+ * @udata: user data for libibverbs.so
+ *
+ * Returns the queue pair on success, otherwise returns an errno.
+ *
+ * Called by the ib_create_qp() core verbs function.
+ */
+struct ib_qp *hfi1_create_qp(struct ib_pd *ibpd,
+ struct ib_qp_init_attr *init_attr,
+ struct ib_udata *udata)
+{
+ struct hfi1_qp *qp;
+ int err;
+ struct hfi1_swqe *swq = NULL;
+ struct hfi1_ibdev *dev;
+ struct hfi1_devdata *dd;
+ size_t sz;
+ size_t sg_list_sz;
+ struct ib_qp *ret;
+
+ if (init_attr->cap.max_send_sge > hfi1_max_sges ||
+ init_attr->cap.max_send_wr > hfi1_max_qp_wrs ||
+ init_attr->create_flags) {
+ ret = ERR_PTR(-EINVAL);
+ goto bail;
+ }
+
+ /* Check receive queue parameters if no SRQ is specified. */
+ if (!init_attr->srq) {
+ if (init_attr->cap.max_recv_sge > hfi1_max_sges ||
+ init_attr->cap.max_recv_wr > hfi1_max_qp_wrs) {
+ ret = ERR_PTR(-EINVAL);
+ goto bail;
+ }
+ if (init_attr->cap.max_send_sge +
+ init_attr->cap.max_send_wr +
+ init_attr->cap.max_recv_sge +
+ init_attr->cap.max_recv_wr == 0) {
+ ret = ERR_PTR(-EINVAL);
+ goto bail;
+ }
+ }
+
+ switch (init_attr->qp_type) {
+ case IB_QPT_SMI:
+ case IB_QPT_GSI:
+ if (init_attr->port_num == 0 ||
+ init_attr->port_num > ibpd->device->phys_port_cnt) {
+ ret = ERR_PTR(-EINVAL);
+ goto bail;
+ }
+ case IB_QPT_UC:
+ case IB_QPT_RC:
+ case IB_QPT_UD:
+ sz = sizeof(struct hfi1_sge) *
+ init_attr->cap.max_send_sge +
+ sizeof(struct hfi1_swqe);
+ swq = vmalloc((init_attr->cap.max_send_wr + 1) * sz);
+ if (swq == NULL) {
+ ret = ERR_PTR(-ENOMEM);
+ goto bail;
+ }
+ sz = sizeof(*qp);
+ sg_list_sz = 0;
+ if (init_attr->srq) {
+ struct hfi1_srq *srq = to_isrq(init_attr->srq);
+
+ if (srq->rq.max_sge > 1)
+ sg_list_sz = sizeof(*qp->r_sg_list) *
+ (srq->rq.max_sge - 1);
+ } else if (init_attr->cap.max_recv_sge > 1)
+ sg_list_sz = sizeof(*qp->r_sg_list) *
+ (init_attr->cap.max_recv_sge - 1);
+ qp = kzalloc(sz + sg_list_sz, GFP_KERNEL);
+ if (!qp) {
+ ret = ERR_PTR(-ENOMEM);
+ goto bail_swq;
+ }
+ RCU_INIT_POINTER(qp->next, NULL);
+ qp->s_hdr = kzalloc(sizeof(*qp->s_hdr), GFP_KERNEL);
+ if (!qp->s_hdr) {
+ ret = ERR_PTR(-ENOMEM);
+ goto bail_qp;
+ }
+ qp->timeout_jiffies =
+ usecs_to_jiffies((4096UL * (1UL << qp->timeout)) /
+ 1000UL);
+ if (init_attr->srq)
+ sz = 0;
+ else {
+ qp->r_rq.size = init_attr->cap.max_recv_wr + 1;
+ qp->r_rq.max_sge = init_attr->cap.max_recv_sge;
+ sz = (sizeof(struct ib_sge) * qp->r_rq.max_sge) +
+ sizeof(struct hfi1_rwqe);
+ qp->r_rq.wq = vmalloc_user(sizeof(struct hfi1_rwq) +
+ qp->r_rq.size * sz);
+ if (!qp->r_rq.wq) {
+ ret = ERR_PTR(-ENOMEM);
+ goto bail_qp;
+ }
+ }
+
+ /*
+ * ib_create_qp() will initialize qp->ibqp
+ * except for qp->ibqp.qp_num.
+ */
+ spin_lock_init(&qp->r_lock);
+ spin_lock_init(&qp->s_lock);
+ spin_lock_init(&qp->r_rq.lock);
+ atomic_set(&qp->refcount, 0);
+ init_waitqueue_head(&qp->wait);
+ init_timer(&qp->s_timer);
+ qp->s_timer.data = (unsigned long)qp;
+ INIT_LIST_HEAD(&qp->rspwait);
+ qp->state = IB_QPS_RESET;
+ qp->s_wq = swq;
+ qp->s_size = init_attr->cap.max_send_wr + 1;
+ qp->s_max_sge = init_attr->cap.max_send_sge;
+ if (init_attr->sq_sig_type == IB_SIGNAL_REQ_WR)
+ qp->s_flags = HFI1_S_SIGNAL_REQ_WR;
+ dev = to_idev(ibpd->device);
+ dd = dd_from_dev(dev);
+ err = alloc_qpn(dd, &dev->qp_dev->qpn_table, init_attr->qp_type,
+ init_attr->port_num);
+ if (err < 0) {
+ ret = ERR_PTR(err);
+ vfree(qp->r_rq.wq);
+ goto bail_qp;
+ }
+ qp->ibqp.qp_num = err;
+ qp->port_num = init_attr->port_num;
+ reset_qp(qp, init_attr->qp_type);
+ break;
+
+ default:
+ /* Don't support raw QPs */
+ ret = ERR_PTR(-ENOSYS);
+ goto bail;
+ }
+
+ init_attr->cap.max_inline_data = 0;
+
+ /*
+ * Return the address of the RWQ as the offset to mmap.
+ * See hfi1_mmap() for details.
+ */
+ if (udata && udata->outlen >= sizeof(__u64)) {
+ if (!qp->r_rq.wq) {
+ __u64 offset = 0;
+
+ err = ib_copy_to_udata(udata, &offset,
+ sizeof(offset));
+ if (err) {
+ ret = ERR_PTR(err);
+ goto bail_ip;
+ }
+ } else {
+ u32 s = sizeof(struct hfi1_rwq) + qp->r_rq.size * sz;
+
+ qp->ip = hfi1_create_mmap_info(dev, s,
+ ibpd->uobject->context,
+ qp->r_rq.wq);
+ if (!qp->ip) {
+ ret = ERR_PTR(-ENOMEM);
+ goto bail_ip;
+ }
+
+ err = ib_copy_to_udata(udata, &(qp->ip->offset),
+ sizeof(qp->ip->offset));
+ if (err) {
+ ret = ERR_PTR(err);
+ goto bail_ip;
+ }
+ }
+ }
+
+ spin_lock(&dev->n_qps_lock);
+ if (dev->n_qps_allocated == hfi1_max_qps) {
+ spin_unlock(&dev->n_qps_lock);
+ ret = ERR_PTR(-ENOMEM);
+ goto bail_ip;
+ }
+
+ dev->n_qps_allocated++;
+ spin_unlock(&dev->n_qps_lock);
+
+ if (qp->ip) {
+ spin_lock_irq(&dev->pending_lock);
+ list_add(&qp->ip->pending_mmaps, &dev->pending_mmaps);
+ spin_unlock_irq(&dev->pending_lock);
+ }
+
+ ret = &qp->ibqp;
+ goto bail;
+
+bail_ip:
+ if (qp->ip)
+ kref_put(&qp->ip->ref, hfi1_release_mmap_info);
+ else
+ vfree(qp->r_rq.wq);
+ free_qpn(&dev->qp_dev->qpn_table, qp->ibqp.qp_num);
+bail_qp:
+ kfree(qp->s_hdr);
+ kfree(qp);
+bail_swq:
+ vfree(swq);
+bail:
+ return ret;
+}
+
+/**
+ * hfi1_destroy_qp - destroy a queue pair
+ * @ibqp: the queue pair to destroy
+ *
+ * Returns 0 on success.
+ *
+ * Note that this can be called while the QP is actively sending or
+ * receiving!
+ */
+int hfi1_destroy_qp(struct ib_qp *ibqp)
+{
+ struct hfi1_qp *qp = to_iqp(ibqp);
+ struct hfi1_ibdev *dev = to_idev(ibqp->device);
+
+ /* Make sure HW and driver activity is stopped. */
+ spin_lock_irq(&qp->r_lock);
+ spin_lock(&qp->s_lock);
+ if (qp->state != IB_QPS_RESET) {
+ qp->state = IB_QPS_RESET;
+ flush_iowait(qp);
+ qp->s_flags &= ~(HFI1_S_TIMER | HFI1_S_ANY_WAIT);
+ spin_unlock(&qp->s_lock);
+ spin_unlock_irq(&qp->r_lock);
+ cancel_work_sync(&qp->s_iowait.iowork);
+ del_timer_sync(&qp->s_timer);
+ iowait_sdma_drain(&qp->s_iowait);
+ flush_tx_list(qp);
+ remove_qp(dev, qp);
+ wait_event(qp->wait, !atomic_read(&qp->refcount));
+ spin_lock_irq(&qp->r_lock);
+ spin_lock(&qp->s_lock);
+ clear_mr_refs(qp, 1);
+ clear_ahg(qp);
+ }
+ spin_unlock(&qp->s_lock);
+ spin_unlock_irq(&qp->r_lock);
+
+ /* all user's cleaned up, mark it available */
+ free_qpn(&dev->qp_dev->qpn_table, qp->ibqp.qp_num);
+ spin_lock(&dev->n_qps_lock);
+ dev->n_qps_allocated--;
+ spin_unlock(&dev->n_qps_lock);
+
+ if (qp->ip)
+ kref_put(&qp->ip->ref, hfi1_release_mmap_info);
+ else
+ vfree(qp->r_rq.wq);
+ vfree(qp->s_wq);
+ kfree(qp->s_hdr);
+ kfree(qp);
+ return 0;
+}
+
+/**
+ * init_qpn_table - initialize the QP number table for a device
+ * @qpt: the QPN table
+ */
+static int init_qpn_table(struct hfi1_devdata *dd, struct hfi1_qpn_table *qpt)
+{
+ u32 offset, qpn, i;
+ struct qpn_map *map;
+ int ret = 0;
+
+ spin_lock_init(&qpt->lock);
+
+ qpt->last = 0;
+ qpt->incr = 1 << dd->qos_shift;
+
+ /* insure we don't assign QPs from KDETH 64K window */
+ qpn = kdeth_qp << 16;
+ qpt->nmaps = qpn / BITS_PER_PAGE;
+ /* This should always be zero */
+ offset = qpn & BITS_PER_PAGE_MASK;
+ map = &qpt->map[qpt->nmaps];
+ dd_dev_info(dd, "Reserving QPNs for KDETH window from 0x%x to 0x%x\n",
+ qpn, qpn + 65535);
+ for (i = 0; i < 65536; i++) {
+ if (!map->page) {
+ get_map_page(qpt, map);
+ if (!map->page) {
+ ret = -ENOMEM;
+ break;
+ }
+ }
+ set_bit(offset, map->page);
+ offset++;
+ if (offset == BITS_PER_PAGE) {
+ /* next page */
+ qpt->nmaps++;
+ map++;
+ offset = 0;
+ }
+ }
+ return ret;
+}
+
+/**
+ * free_qpn_table - free the QP number table for a device
+ * @qpt: the QPN table
+ */
+static void free_qpn_table(struct hfi1_qpn_table *qpt)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(qpt->map); i++)
+ free_page((unsigned long) qpt->map[i].page);
+}
+
+/**
+ * hfi1_get_credit - flush the send work queue of a QP
+ * @qp: the qp who's send work queue to flush
+ * @aeth: the Acknowledge Extended Transport Header
+ *
+ * The QP s_lock should be held.
+ */
+void hfi1_get_credit(struct hfi1_qp *qp, u32 aeth)
+{
+ u32 credit = (aeth >> HFI1_AETH_CREDIT_SHIFT) & HFI1_AETH_CREDIT_MASK;
+
+ /*
+ * If the credit is invalid, we can send
+ * as many packets as we like. Otherwise, we have to
+ * honor the credit field.
+ */
+ if (credit == HFI1_AETH_CREDIT_INVAL) {
+ if (!(qp->s_flags & HFI1_S_UNLIMITED_CREDIT)) {
+ qp->s_flags |= HFI1_S_UNLIMITED_CREDIT;
+ if (qp->s_flags & HFI1_S_WAIT_SSN_CREDIT) {
+ qp->s_flags &= ~HFI1_S_WAIT_SSN_CREDIT;
+ hfi1_schedule_send(qp);
+ }
+ }
+ } else if (!(qp->s_flags & HFI1_S_UNLIMITED_CREDIT)) {
+ /* Compute new LSN (i.e., MSN + credit) */
+ credit = (aeth + credit_table[credit]) & HFI1_MSN_MASK;
+ if (cmp_msn(credit, qp->s_lsn) > 0) {
+ qp->s_lsn = credit;
+ if (qp->s_flags & HFI1_S_WAIT_SSN_CREDIT) {
+ qp->s_flags &= ~HFI1_S_WAIT_SSN_CREDIT;
+ hfi1_schedule_send(qp);
+ }
+ }
+ }
+}
+
+void hfi1_qp_wakeup(struct hfi1_qp *qp, u32 flag)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&qp->s_lock, flags);
+ if (qp->s_flags & flag) {
+ qp->s_flags &= ~flag;
+ trace_hfi1_qpwakeup(qp, flag);
+ hfi1_schedule_send(qp);
+ }
+ spin_unlock_irqrestore(&qp->s_lock, flags);
+ /* Notify hfi1_destroy_qp() if it is waiting. */
+ if (atomic_dec_and_test(&qp->refcount))
+ wake_up(&qp->wait);
+}
+
+static int iowait_sleep(
+ struct sdma_engine *sde,
+ struct iowait *wait,
+ struct sdma_txreq *stx,
+ unsigned seq)
+{
+ struct verbs_txreq *tx = container_of(stx, struct verbs_txreq, txreq);
+ struct hfi1_qp *qp;
+ unsigned long flags;
+ int ret = 0;
+ struct hfi1_ibdev *dev;
+
+ qp = tx->qp;
+
+ spin_lock_irqsave(&qp->s_lock, flags);
+ if (ib_hfi1_state_ops[qp->state] & HFI1_PROCESS_RECV_OK) {
+
+ /*
+ * If we couldn't queue the DMA request, save the info
+ * and try again later rather than destroying the
+ * buffer and undoing the side effects of the copy.
+ */
+ /* Make a common routine? */
+ dev = &sde->dd->verbs_dev;
+ list_add_tail(&stx->list, &wait->tx_head);
+ spin_lock(&dev->pending_lock);
+ if (sdma_progress(sde, seq, stx))
+ goto eagain;
+ if (list_empty(&qp->s_iowait.list)) {
+ struct hfi1_ibport *ibp =
+ to_iport(qp->ibqp.device, qp->port_num);
+
+ ibp->n_dmawait++;
+ qp->s_flags |= HFI1_S_WAIT_DMA_DESC;
+ list_add_tail(&qp->s_iowait.list, &sde->dmawait);
+ trace_hfi1_qpsleep(qp, HFI1_S_WAIT_DMA_DESC);
+ atomic_inc(&qp->refcount);
+ }
+ spin_unlock(&dev->pending_lock);
+ qp->s_flags &= ~HFI1_S_BUSY;
+ spin_unlock_irqrestore(&qp->s_lock, flags);
+ ret = -EBUSY;
+ } else {
+ spin_unlock_irqrestore(&qp->s_lock, flags);
+ hfi1_put_txreq(tx);
+ }
+ return ret;
+eagain:
+ spin_unlock(&dev->pending_lock);
+ spin_unlock_irqrestore(&qp->s_lock, flags);
+ list_del_init(&stx->list);
+ return -EAGAIN;
+}
+
+static void iowait_wakeup(struct iowait *wait, int reason)
+{
+ struct hfi1_qp *qp = container_of(wait, struct hfi1_qp, s_iowait);
+
+ BUG_ON(reason != SDMA_AVAIL_REASON);
+ hfi1_qp_wakeup(qp, HFI1_S_WAIT_DMA_DESC);
+}
+
+int hfi1_qp_init(struct hfi1_ibdev *dev)
+{
+ struct hfi1_devdata *dd = dd_from_dev(dev);
+ int i;
+ int ret = -ENOMEM;
+
+ /* allocate parent object */
+ dev->qp_dev = kzalloc(sizeof(*dev->qp_dev), GFP_KERNEL);
+ if (!dev->qp_dev)
+ goto nomem;
+ /* allocate hash table */
+ dev->qp_dev->qp_table_size = hfi1_qp_table_size;
+ get_random_bytes(&dev->qp_dev->qp_rnd,
+ sizeof(dev->qp_dev->qp_rnd));
+ dev->qp_dev->qp_table =
+ kmalloc(dev->qp_dev->qp_table_size *
+ sizeof(*dev->qp_dev->qp_table),
+ GFP_KERNEL);
+ if (!dev->qp_dev->qp_table)
+ goto nomem;
+ for (i = 0; i < dev->qp_dev->qp_table_size; i++)
+ RCU_INIT_POINTER(dev->qp_dev->qp_table[i], NULL);
+ spin_lock_init(&dev->qp_dev->qpt_lock);
+ /* initialize qpn map */
+ ret = init_qpn_table(dd, &dev->qp_dev->qpn_table);
+ if (ret)
+ goto nomem;
+ return ret;
+nomem:
+ if (dev->qp_dev) {
+ kfree(dev->qp_dev->qp_table);
+ free_qpn_table(&dev->qp_dev->qpn_table);
+ kfree(dev->qp_dev);
+ }
+ return ret;
+}
+
+void hfi1_qp_exit(struct hfi1_ibdev *dev)
+{
+ struct hfi1_devdata *dd = dd_from_dev(dev);
+ u32 qps_inuse;
+
+ qps_inuse = free_all_qps(dd);
+ if (qps_inuse)
+ dd_dev_err(dd, "QP memory leak! %u still in use\n",
+ qps_inuse);
+ if (dev->qp_dev) {
+ kfree(dev->qp_dev->qp_table);
+ free_qpn_table(&dev->qp_dev->qpn_table);
+ kfree(dev->qp_dev);
+ }
+}
+
+/**
+ *
+ * qp_to_sdma_engine - map a qp to a send engine
+ * @qp: the QP
+ * @sc5: the 5 bit sc
+ *
+ * Return:
+ * A send engine for the qp or NULL for SMI type qp.
+ */
+struct sdma_engine *qp_to_sdma_engine(struct hfi1_qp *qp, u8 sc5)
+{
+ struct hfi1_devdata *dd = dd_from_ibdev(qp->ibqp.device);
+ struct sdma_engine *sde;
+
+ if (!(dd->flags & HFI1_HAS_SEND_DMA))
+ return NULL;
+ switch (qp->ibqp.qp_type) {
+ case IB_QPT_UC:
+ case IB_QPT_RC:
+ break;
+ case IB_QPT_SMI:
+ return NULL;
+ default:
+ break;
+ }
+ sde = sdma_select_engine_sc(dd, qp->ibqp.qp_num >> dd->qos_shift, sc5);
+ return sde;
+}
+
+struct qp_iter {
+ struct hfi1_ibdev *dev;
+ struct hfi1_qp *qp;
+ int specials;
+ int n;
+};
+
+struct qp_iter *qp_iter_init(struct hfi1_ibdev *dev)
+{
+ struct qp_iter *iter;
+
+ iter = kzalloc(sizeof(*iter), GFP_KERNEL);
+ if (!iter)
+ return NULL;
+
+ iter->dev = dev;
+ iter->specials = dev->ibdev.phys_port_cnt * 2;
+ if (qp_iter_next(iter)) {
+ kfree(iter);
+ return NULL;
+ }
+
+ return iter;
+}
+
+int qp_iter_next(struct qp_iter *iter)
+{
+ struct hfi1_ibdev *dev = iter->dev;
+ int n = iter->n;
+ int ret = 1;
+ struct hfi1_qp *pqp = iter->qp;
+ struct hfi1_qp *qp;
+
+ /*
+ * The approach is to consider the special qps
+ * as an additional table entries before the
+ * real hash table. Since the qp code sets
+ * the qp->next hash link to NULL, this works just fine.
+ *
+ * iter->specials is 2 * # ports
+ *
+ * n = 0..iter->specials is the special qp indices
+ *
+ * n = iter->specials..dev->qp_dev->qp_table_size+iter->specials are
+ * the potential hash bucket entries
+ *
+ */
+ for (; n < dev->qp_dev->qp_table_size + iter->specials; n++) {
+ if (pqp) {
+ qp = rcu_dereference(pqp->next);
+ } else {
+ if (n < iter->specials) {
+ struct hfi1_pportdata *ppd;
+ struct hfi1_ibport *ibp;
+ int pidx;
+
+ pidx = n % dev->ibdev.phys_port_cnt;
+ ppd = &dd_from_dev(dev)->pport[pidx];
+ ibp = &ppd->ibport_data;
+
+ if (!(n & 1))
+ qp = rcu_dereference(ibp->qp0);
+ else
+ qp = rcu_dereference(ibp->qp1);
+ } else {
+ qp = rcu_dereference(
+ dev->qp_dev->qp_table[
+ (n - iter->specials)]);
+ }
+ }
+ pqp = qp;
+ if (qp) {
+ iter->qp = qp;
+ iter->n = n;
+ return 0;
+ }
+ }
+ return ret;
+}
+
+static const char * const qp_type_str[] = {
+ "SMI", "GSI", "RC", "UC", "UD",
+};
+
+static int qp_idle(struct hfi1_qp *qp)
+{
+ return
+ qp->s_last == qp->s_acked &&
+ qp->s_acked == qp->s_cur &&
+ qp->s_cur == qp->s_tail &&
+ qp->s_tail == qp->s_head;
+}
+
+void qp_iter_print(struct seq_file *s, struct qp_iter *iter)
+{
+ struct hfi1_swqe *wqe;
+ struct hfi1_qp *qp = iter->qp;
+ struct sdma_engine *sde;
+
+ sde = qp_to_sdma_engine(qp, qp->s_sc);
+ wqe = get_swqe_ptr(qp, qp->s_last);
+ seq_printf(s,
+ "N %d %s QP%u R %u %s %u %u %u f=%x %u %u %u %u %u PSN %x %x %x %x %x (%u %u %u %u %u %u) QP%u LID %x SL %u MTU %d %u %u %u SDE %p,%u\n",
+ iter->n,
+ qp_idle(qp) ? "I" : "B",
+ qp->ibqp.qp_num,
+ atomic_read(&qp->refcount),
+ qp_type_str[qp->ibqp.qp_type],
+ qp->state,
+ wqe ? wqe->wr.opcode : 0,
+ qp->s_hdrwords,
+ qp->s_flags,
+ atomic_read(&qp->s_iowait.sdma_busy),
+ !list_empty(&qp->s_iowait.list),
+ qp->timeout,
+ wqe ? wqe->ssn : 0,
+ qp->s_lsn,
+ qp->s_last_psn,
+ qp->s_psn, qp->s_next_psn,
+ qp->s_sending_psn, qp->s_sending_hpsn,
+ qp->s_last, qp->s_acked, qp->s_cur,
+ qp->s_tail, qp->s_head, qp->s_size,
+ qp->remote_qpn,
+ qp->remote_ah_attr.dlid,
+ qp->remote_ah_attr.sl,
+ qp->pmtu,
+ qp->s_retry_cnt,
+ qp->timeout,
+ qp->s_rnr_retry_cnt,
+ sde,
+ sde ? sde->this_idx : 0);
+}
diff --git a/drivers/infiniband/hw/hfi1/qp.h b/drivers/infiniband/hw/hfi1/qp.h
new file mode 100644
index 0000000..442d2d1
--- /dev/null
+++ b/drivers/infiniband/hw/hfi1/qp.h
@@ -0,0 +1,206 @@
+#ifndef _QP_H
+#define _QP_H
+/*
+ *
+ * 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
+ *
+ * Copyright(c) 2015 Intel Corporation.
+ *
+ * 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
+ *
+ * Copyright(c) 2015 Intel Corporation.
+ *
+ * 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 "verbs.h"
+
+#define QPN_MAX (1 << 24)
+#define QPNMAP_ENTRIES (QPN_MAX / PAGE_SIZE / BITS_PER_BYTE)
+
+/*
+ * QPN-map pages start out as NULL, they get allocated upon
+ * first use and are never deallocated. This way,
+ * large bitmaps are not allocated unless large numbers of QPs are used.
+ */
+struct qpn_map {
+ void *page;
+};
+
+struct hfi1_qpn_table {
+ spinlock_t lock; /* protect changes in this struct */
+ unsigned flags; /* flags for QP0/1 allocated for each port */
+ u32 last; /* last QP number allocated */
+ u32 nmaps; /* size of the map table */
+ u16 limit;
+ u8 incr;
+ /* bit map of free QP numbers other than 0/1 */
+ struct qpn_map map[QPNMAP_ENTRIES];
+};
+
+struct hfi1_qp_ibdev {
+ u32 qp_table_size;
+ u32 qp_rnd;
+ struct hfi1_qp __rcu **qp_table;
+ spinlock_t qpt_lock;
+ struct hfi1_qpn_table qpn_table;
+};
+
+/**
+ * hfi1_lookup_qpn - return the QP with the given QPN
+ * @ibp: a pointer to the IB port
+ * @qpn: the QP number to look up
+ *
+ * The caller is responsible for decrementing the QP reference count
+ * when done.
+ */
+struct hfi1_qp *hfi1_lookup_qpn(struct hfi1_ibport *ibp, u32 qpn);
+
+/**
+ * hfi1_error_qp - put a QP into the error state
+ * @qp: the QP to put into the error state
+ * @err: the receive completion error to signal if a RWQE is active
+ *
+ * Flushes both send and receive work queues.
+ * Returns true if last WQE event should be generated.
+ * The QP r_lock and s_lock should be held and interrupts disabled.
+ * If we are already in error state, just return.
+ */
+int hfi1_error_qp(struct hfi1_qp *qp, enum ib_wc_status err);
+
+/**
+ * hfi1_modify_qp - modify the attributes of a queue pair
+ * @ibqp: the queue pair who's attributes we're modifying
+ * @attr: the new attributes
+ * @attr_mask: the mask of attributes to modify
+ * @udata: user data for libibverbs.so
+ *
+ * Returns 0 on success, otherwise returns an errno.
+ */
+int hfi1_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
+ int attr_mask, struct ib_udata *udata);
+
+int hfi1_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
+ int attr_mask, struct ib_qp_init_attr *init_attr);
+
+/**
+ * hfi1_compute_aeth - compute the AETH (syndrome + MSN)
+ * @qp: the queue pair to compute the AETH for
+ *
+ * Returns the AETH.
+ */
+__be32 hfi1_compute_aeth(struct hfi1_qp *qp);
+
+/**
+ * hfi1_create_qp - create a queue pair for a device
+ * @ibpd: the protection domain who's device we create the queue pair for
+ * @init_attr: the attributes of the queue pair
+ * @udata: user data for libibverbs.so
+ *
+ * Returns the queue pair on success, otherwise returns an errno.
+ *
+ * Called by the ib_create_qp() core verbs function.
+ */
+struct ib_qp *hfi1_create_qp(struct ib_pd *ibpd,
+ struct ib_qp_init_attr *init_attr,
+ struct ib_udata *udata);
+/**
+ * hfi1_destroy_qp - destroy a queue pair
+ * @ibqp: the queue pair to destroy
+ *
+ * Returns 0 on success.
+ *
+ * Note that this can be called while the QP is actively sending or
+ * receiving!
+ */
+int hfi1_destroy_qp(struct ib_qp *ibqp);
+
+/**
+ * hfi1_get_credit - flush the send work queue of a QP
+ * @qp: the qp who's send work queue to flush
+ * @aeth: the Acknowledge Extended Transport Header
+ *
+ * The QP s_lock should be held.
+ */
+void hfi1_get_credit(struct hfi1_qp *qp, u32 aeth);
+
+/**
+ * hfi1_qp_init - allocate QP tables
+ * @dev: a pointer to the hfi1_ibdev
+ */
+int hfi1_qp_init(struct hfi1_ibdev *dev);
+
+/**
+ * hfi1_qp_exit - free the QP related structures
+ * @dev: a pointer to the hfi1_ibdev
+ */
+void hfi1_qp_exit(struct hfi1_ibdev *dev);
+
+/**
+ * hfi1_qp_waitup - wake up on the indicated event
+ * @qp: the QP
+ * @flag: flag the qp on which the qp is stalled
+ */
+void hfi1_qp_wakeup(struct hfi1_qp *qp, u32 flag);
+
+struct sdma_engine *qp_to_sdma_engine(struct hfi1_qp *qp, u8 sc5);
+
+struct qp_iter;
+
+/**
+ * qp_iter_init - wake up on the indicated event
+ * @dev: the hfi1_ibdev
+ */
+struct qp_iter *qp_iter_init(struct hfi1_ibdev *dev);
+
+/**
+ * qp_iter_next - wakeup on the indicated event
+ * @iter: the iterator for the qp hash list
+ */
+int qp_iter_next(struct qp_iter *iter);
+
+/**
+ * qp_iter_next - wake up on the indicated event
+ * @s: the seq_file to emit the qp information on
+ * @iter: the iterator for the qp hash list
+ */
+void qp_iter_print(struct seq_file *s, struct qp_iter *iter);
+
+#endif /* _PIO_H */