[PATCH 29/53] IB/qib: Add qib_qp.c

Ralph Campbell
2009-11-19T23:39:28Z

creates the qib_qp.c file.

Signed-off-by: Ralph Campbell <ralph.campbell-h88ZbnxC6KDQT0dZR+AlfA@public.gmane.org>
---

drivers/infiniband/hw/qib/qib_qp.c | 1241 ++++++++++++++++++++++++++++++++++++
1 files changed, 1241 insertions(+), 0 deletions(-)
create mode 100644 drivers/infiniband/hw/qib/qib_qp.c

diff --git a/drivers/infiniband/hw/qib/qib_qp.c b/drivers/infiniband/hw/qib/qib_qp.c
new file mode 100644
index 0000000..d0ccbf5
--- /dev/null
+++ b/drivers/infiniband/hw/qib/qib_qp.c
@@ -0,0 +1,1241 @@
+/*
+ * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved.
+ * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * 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.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/err.h>
+#include <linux/vmalloc.h>
+
+#include "qib.h"
+
+#define BITS_PER_PAGE (PAGE_SIZE*BITS_PER_BYTE)
+#define BITS_PER_PAGE_MASK (BITS_PER_PAGE-1)
+
+static inline unsigned mk_qpn(struct qib_qpn_table *qpt,
+ struct qpn_map *map, unsigned off)
+{
+ return (map - qpt->map) * BITS_PER_PAGE + off;
+}
+
+static inline unsigned find_next_offset(struct qib_qpn_table *qpt,
+ struct qpn_map *map, unsigned off,
+ unsigned r)
+{
+ if (qpt->mask) {
+ off++;
+ if ((off & qpt->mask) >> 1 != r)
+ off = ((off & qpt->mask) ?
+ (off | qpt->mask) + 1 : off) | (r << 1);
+ } else
+ off = find_next_zero_bit(map->page, BITS_PER_PAGE, off);
+ return 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 qib_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 qib_devdata *dd, struct qib_qpn_table *qpt,
+ enum ib_qp_type type, u8 port)
+{
+ u32 i, offset, max_scan, qpn;
+ struct qpn_map *map;
+ u32 ret;
+ int r;
+
+ 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;
+ }
+
+ r = smp_processor_id();
+ if (r >= dd->n_krcv_queues)
+ r %= dd->n_krcv_queues;
+ qpn = qpt->last + 1;
+ if (qpn >= QPN_MAX)
+ qpn = 2;
+ if (qpt->mask && ((qpn & qpt->mask) >> 1) != r)
+ qpn = ((qpn & qpt->mask) ? (qpn | qpt->mask) + 1 : qpn) |
+ (r << 1);
+ 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 = find_next_offset(qpt, map, offset, r);
+ qpn = mk_qpn(qpt, map, offset);
+ /*
+ * This test differs from alloc_pidmap().
+ * If find_next_offset() does find a zero
+ * bit, we don't need to check for QPN
+ * wrapping around past our starting QPN.
+ * We just need to be sure we don't loop
+ * forever.
+ */
+ } 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++];
+ offset = qpt->mask ? (r << 1) : 0;
+ } else if (map < &qpt->map[qpt->nmaps]) {
+ ++map;
+ offset = qpt->mask ? (r << 1) : 0;
+ } else {
+ map = &qpt->map[0];
+ offset = qpt->mask ? (r << 1) : 2;
+ }
+ qpn = mk_qpn(qpt, map, offset);
+ }
+
+ ret = -ENOMEM;
+
+bail:
+ return ret;
+}
+
+static void free_qpn(struct qib_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);
+}
+
+/*
+ * Put the QP into the hash table.
+ * The hash table holds a reference to the QP.
+ */
+static void insert_qp(struct qib_ibdev *dev, struct qib_qp *qp)
+{
+ struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
+ unsigned n = qp->ibqp.qp_num % dev->qp_table_size;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev->qpt_lock, flags);
+
+ if (qp->ibqp.qp_num == 0)
+ ibp->qp0 = qp;
+ else if (qp->ibqp.qp_num == 1)
+ ibp->qp1 = qp;
+ else {
+ qp->next = dev->qp_table[n];
+ dev->qp_table[n] = qp;
+ }
+ atomic_inc(&qp->refcount);
+
+ spin_unlock_irqrestore(&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 qib_ibdev *dev, struct qib_qp *qp)
+{
+ struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
+ struct qib_qp *q, **qpp;
+ unsigned long flags;
+
+ qpp = &dev->qp_table[qp->ibqp.qp_num % dev->qp_table_size];
+
+ spin_lock_irqsave(&dev->qpt_lock, flags);
+
+ if (ibp->qp0 == qp) {
+ ibp->qp0 = NULL;
+ atomic_dec(&qp->refcount);
+ } else if (ibp->qp1 == qp) {
+ ibp->qp1 = NULL;
+ atomic_dec(&qp->refcount);
+ } else
+ for (; (q = *qpp) != NULL; qpp = &q->next)
+ if (q == qp) {
+ *qpp = qp->next;
+ qp->next = NULL;
+ atomic_dec(&qp->refcount);
+ break;
+ }
+
+ spin_unlock_irqrestore(&dev->qpt_lock, flags);
+}
+
+/**
+ * qib_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.
+ */
+unsigned qib_free_all_qps(struct qib_devdata *dd)
+{
+ struct qib_ibdev *dev = &dd->verbs_dev;
+ unsigned long flags;
+ struct qib_qp *qp;
+ unsigned n, qp_inuse = 0;
+
+ for (n = 0; n < dd->num_pports; n++) {
+ struct qib_ibport *ibp = &dd->pport[n].ibport_data;
+
+ if (!qib_mcast_tree_empty(ibp))
+ qp_inuse++;
+ if (ibp->qp0)
+ qp_inuse++;
+ if (ibp->qp1)
+ qp_inuse++;
+ }
+
+ spin_lock_irqsave(&dev->qpt_lock, flags);
+ for (n = 0; n < dev->qp_table_size; n++) {
+ qp = dev->qp_table[n];
+ dev->qp_table[n] = NULL;
+
+ for (; qp; qp = qp->next)
+ qp_inuse++;
+ }
+ spin_unlock_irqrestore(&dev->qpt_lock, flags);
+
+ return qp_inuse;
+}
+
+/**
+ * qib_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 qib_qp *qib_lookup_qpn(struct qib_ibport *ibp, u32 qpn)
+{
+ struct qib_ibdev *dev = &ppd_from_ibp(ibp)->dd->verbs_dev;
+ unsigned long flags;
+ struct qib_qp *qp;
+
+ spin_lock_irqsave(&dev->qpt_lock, flags);
+
+ if (qpn == 0)
+ qp = ibp->qp0;
+ else if (qpn == 1)
+ qp = ibp->qp1;
+ else
+ for (qp = dev->qp_table[qpn % dev->qp_table_size]; qp;
+ qp = qp->next)
+ if (qp->ibqp.qp_num == qpn)
+ break;
+ if (qp)
+ atomic_inc(&qp->refcount);
+
+ spin_unlock_irqrestore(&dev->qpt_lock, flags);
+ return qp;
+}
+
+/**
+ * qib_reset_qp - initialize the QP state to the reset state
+ * @qp: the QP to reset
+ * @type: the QP type
+ */
+static void qib_reset_qp(struct qib_qp *qp, enum ib_qp_type type)
+{
+ qp->remote_qpn = 0;
+ qp->qkey = 0;
+ qp->qp_access_flags = 0;
+ atomic_set(&qp->s_dma_busy, 0);
+ qp->s_flags &= QIB_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;
+ 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 qib_qp *qp, int clr_sends)
+{
+ unsigned n;
+
+ while (qp->r_sge.num_sge) {
+ atomic_dec(&qp->r_sge.sge.mr->refcount);
+ if (--qp->r_sge.num_sge)
+ qp->r_sge.sge = *qp->r_sge.sg_list++;
+ }
+
+ if (clr_sends) {
+ while (qp->s_last != qp->s_head) {
+ struct qib_swqe *wqe = get_swqe_ptr(qp, qp->s_last);
+ unsigned i;
+
+ for (i = 0; i < wqe->wr.num_sge; i++) {
+ struct qib_sge *sge = &wqe->sg_list[i];
+
+ atomic_dec(&sge->mr->refcount);
+ }
+ 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) {
+ atomic_dec(&qp->s_rdma_mr->refcount);
+ 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 qib_ack_entry *e = &qp->s_ack_queue[n];
+
+ if (e->opcode == IB_OPCODE_RC_RDMA_READ_REQUEST &&
+ e->rdma_sge.mr) {
+ atomic_dec(&e->rdma_sge.mr->refcount);
+ e->rdma_sge.mr = NULL;
+ }
+ }
+}
+
+/**
+ * qib_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 s_lock should be held and interrupts disabled.
+ * If we are already in error state, just return.
+ */
+int qib_error_qp(struct qib_qp *qp, enum ib_wc_status err)
+{
+ struct qib_ibdev *dev = to_idev(qp->ibqp.device);
+ struct ib_wc wc;
+ int ret = 0;
+
+ if (qp->state == IB_QPS_ERR)
+ goto bail;
+
+ qp->state = IB_QPS_ERR;
+
+ if (qp->s_flags & (QIB_S_TIMER | QIB_S_WAIT_RNR)) {
+ qp->s_flags &= ~(QIB_S_TIMER | QIB_S_WAIT_RNR);
+ del_timer(&qp->s_timer);
+ }
+ spin_lock(&dev->pending_lock);
+ if (!list_empty(&qp->iowait) && !(qp->s_flags & QIB_S_BUSY)) {
+ qp->s_flags &= ~QIB_S_ANY_WAIT_IO;
+ list_del_init(&qp->iowait);
+ }
+ spin_unlock(&dev->pending_lock);
+
+ if (!(qp->s_flags & QIB_S_BUSY)) {
+ qp->s_hdrwords = 0;
+ if (qp->s_rdma_mr) {
+ atomic_dec(&qp->s_rdma_mr->refcount);
+ qp->s_rdma_mr = NULL;
+ }
+ if (qp->s_tx) {
+ qib_put_txreq(qp->s_tx);
+ qp->s_tx = NULL;
+ }
+ }
+
+ /* Schedule the sending tasklet to drain the send work queue. */
+ if (qp->s_last != qp->s_head)
+ qib_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(QIB_R_WRID_VALID, &qp->r_aflags)) {
+ wc.wr_id = qp->r_wr_id;
+ wc.status = err;
+ qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1);
+ }
+ wc.status = IB_WC_WR_FLUSH_ERR;
+
+ if (qp->r_rq.wq) {
+ struct qib_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;
+ qib_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;
+}
+
+/**
+ * qib_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 qib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
+ int attr_mask, struct ib_udata *udata)
+{
+ struct qib_ibdev *dev = to_idev(ibqp->device);
+ struct qib_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 */
+
+ spin_lock_irq(&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))
+ goto inval;
+
+ if (attr_mask & IB_QP_AV) {
+ if (attr->ah_attr.dlid >= QIB_MULTICAST_LID_BASE)
+ goto inval;
+ if (qib_check_ah(qp->ibqp.device, &attr->ah_attr))
+ goto inval;
+ }
+
+ if (attr_mask & IB_QP_ALT_PATH) {
+ if (attr->alt_ah_attr.dlid >= QIB_MULTICAST_LID_BASE)
+ goto inval;
+ if (qib_check_ah(qp->ibqp.device, &attr->alt_ah_attr))
+ goto inval;
+ if (attr->alt_pkey_index >= qib_get_npkeys(dd_from_dev(dev)))
+ goto inval;
+ }
+
+ if (attr_mask & IB_QP_PKEY_INDEX)
+ if (attr->pkey_index >= qib_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 > QIB_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) {
+ struct qib_devdata *dd = dd_from_dev(dev);
+ int mtu, pidx = qp->port_num - 1;
+
+ mtu = ib_mtu_enum_to_int(attr->path_mtu);
+ if (mtu == -1)
+ goto inval;
+ if (mtu > dd->pport[pidx].ibmtu) {
+ switch (dd->pport[pidx].ibmtu) {
+ case 4096:
+ pmtu = IB_MTU_4096;
+ break;
+ case 2048:
+ pmtu = IB_MTU_2048;
+ break;
+ case 1024:
+ pmtu = IB_MTU_1024;
+ break;
+ case 512:
+ pmtu = IB_MTU_512;
+ break;
+ case 256:
+ pmtu = IB_MTU_256;
+ break;
+ default:
+ pmtu = 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 > QIB_MAX_RDMA_ATOMIC)
+ goto inval;
+
+ switch (new_state) {
+ case IB_QPS_RESET:
+ if (qp->state != IB_QPS_RESET) {
+ qp->state = IB_QPS_RESET;
+ spin_lock(&dev->pending_lock);
+ if (!list_empty(&qp->iowait))
+ list_del_init(&qp->iowait);
+ spin_unlock(&dev->pending_lock);
+ qp->s_flags &= ~(QIB_S_TIMER | QIB_S_ANY_WAIT);
+ spin_unlock_irq(&qp->s_lock);
+ /* Stop the sending work queue and retry timer */
+ cancel_work_sync(&qp->s_work);
+ del_timer_sync(&qp->s_timer);
+ wait_event(qp->wait_dma, !atomic_read(&qp->s_dma_busy));
+ if (qp->s_tx) {
+ qib_put_txreq(qp->s_tx);
+ qp->s_tx = NULL;
+ }
+ remove_qp(dev, qp);
+ wait_event(qp->wait, !atomic_read(&qp->refcount));
+ spin_lock_irq(&qp->s_lock);
+ clear_mr_refs(qp, 1);
+ qib_reset_qp(qp, ibqp->qp_type);
+ }
+ break;
+
+ case IB_QPS_RTR:
+ /* Allow event to retrigger if QP set to RTR more than once */
+ qp->r_flags &= ~QIB_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 = qib_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 & QIB_PSN_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 & QIB_PSN_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;
+ }
+
+ 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;
+ }
+ }
+
+ if (attr_mask & IB_QP_PATH_MTU)
+ qp->path_mtu = pmtu;
+
+ 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;
+
+ 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_irq(&qp->s_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_irq(&qp->s_lock);
+ ret = -EINVAL;
+
+bail:
+ return ret;
+}
+
+int qib_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
+ int attr_mask, struct ib_qp_init_attr *init_attr)
+{
+ struct qib_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 = qp->r_psn & QIB_PSN_MASK;
+ attr->sq_psn = qp->s_next_psn & QIB_PSN_MASK;
+ 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 & QIB_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;
+}
+
+/**
+ * qib_compute_aeth - compute the AETH (syndrome + MSN)
+ * @qp: the queue pair to compute the AETH for
+ *
+ * Returns the AETH.
+ */
+__be32 qib_compute_aeth(struct qib_qp *qp)
+{
+ u32 aeth = qp->r_msn & QIB_MSN_MASK;
+
+ if (qp->ibqp.srq) {
+ /*
+ * Shared receive queues don't generate credits.
+ * Set the credit field to the invalid value.
+ */
+ aeth |= QIB_AETH_CREDIT_INVAL << QIB_AETH_CREDIT_SHIFT;
+ } else {
+ u32 min, max, x;
+ u32 credits;
+ struct qib_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).
+ * XXX Not holding the r_rq.lock here so there is a small
+ * chance that the pair of reads are not atomic.
+ */
+ 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 << QIB_AETH_CREDIT_SHIFT;
+ }
+ return cpu_to_be32(aeth);
+}
+
+/**
+ * qib_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 *qib_create_qp(struct ib_pd *ibpd,
+ struct ib_qp_init_attr *init_attr,
+ struct ib_udata *udata)
+{
+ struct qib_qp *qp;
+ int err;
+ struct qib_swqe *swq = NULL;
+ struct qib_ibdev *dev;
+ struct qib_devdata *dd;
+ size_t sz;
+ size_t sg_list_sz;
+ struct ib_qp *ret;
+
+ if (init_attr->cap.max_send_sge > ib_qib_max_sges ||
+ init_attr->cap.max_send_wr > ib_qib_max_qp_wrs) {
+ 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 > ib_qib_max_sges ||
+ init_attr->cap.max_recv_wr > ib_qib_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 qib_sge) *
+ init_attr->cap.max_send_sge +
+ sizeof(struct qib_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 qib_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;
+ }
+ 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 qib_rwqe);
+ qp->r_rq.wq = vmalloc_user(sizeof(struct qib_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_waitqueue_head(&qp->wait_dma);
+ init_timer(&qp->s_timer);
+ qp->s_timer.data = (unsigned long)qp;
+ INIT_WORK(&qp->s_work, qib_do_send);
+ INIT_LIST_HEAD(&qp->iowait);
+ 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 = QIB_S_SIGNAL_REQ_WR;
+ dev = to_idev(ibpd->device);
+ dd = dd_from_dev(dev);
+ err = alloc_qpn(dd, &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;
+ qp->processor_id = smp_processor_id();
+ qib_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 qib_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 qib_rwq) + qp->r_rq.size * sz;
+
+ qp->ip = qib_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 == ib_qib_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, qib_release_mmap_info);
+ else
+ vfree(qp->r_rq.wq);
+ free_qpn(&dev->qpn_table, qp->ibqp.qp_num);
+bail_qp:
+ kfree(qp);
+bail_swq:
+ vfree(swq);
+bail:
+ return ret;
+}
+
+/**
+ * qib_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 qib_destroy_qp(struct ib_qp *ibqp)
+{
+ struct qib_qp *qp = to_iqp(ibqp);
+ struct qib_ibdev *dev = to_idev(ibqp->device);
+
+ /* Make sure HW and driver activity is stopped. */
+ spin_lock_irq(&qp->s_lock);
+ if (qp->state != IB_QPS_RESET) {
+ qp->state = IB_QPS_RESET;
+ spin_lock(&dev->pending_lock);
+ if (!list_empty(&qp->iowait))
+ list_del_init(&qp->iowait);
+ spin_unlock(&dev->pending_lock);
+ qp->s_flags &= ~(QIB_S_TIMER | QIB_S_ANY_WAIT);
+ spin_unlock_irq(&qp->s_lock);
+ cancel_work_sync(&qp->s_work);
+ del_timer_sync(&qp->s_timer);
+ wait_event(qp->wait_dma, !atomic_read(&qp->s_dma_busy));
+ if (qp->s_tx) {
+ qib_put_txreq(qp->s_tx);
+ qp->s_tx = NULL;
+ }
+ remove_qp(dev, qp);
+ wait_event(qp->wait, !atomic_read(&qp->refcount));
+ clear_mr_refs(qp, 1);
+ } else
+ spin_unlock_irq(&qp->s_lock);
+
+ /* all user's cleaned up, mark it available */
+ free_qpn(&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, qib_release_mmap_info);
+ else
+ vfree(qp->r_rq.wq);
+ vfree(qp->s_wq);
+ kfree(qp);
+ return 0;
+}
+
+/**
+ * qib_init_qpn_table - initialize the QP number table for a device
+ * @qpt: the QPN table
+ */
+void qib_init_qpn_table(struct qib_devdata *dd, struct qib_qpn_table *qpt)
+{
+ spin_lock_init(&qpt->lock);
+ qpt->last = 1; /* start with QPN 2 */
+ qpt->nmaps = 1;
+ qpt->mask = dd->qpn_mask;
+}
+
+/**
+ * qib_free_qpn_table - free the QP number table for a device
+ * @qpt: the QPN table
+ */
+void qib_free_qpn_table(struct qib_qpn_table *qpt)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(qpt->map); i++)
+ if (qpt->map[i].page)
+ free_page((unsigned long) qpt->map[i].page);
+}
+
+/**
+ * qib_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 qib_get_credit(struct qib_qp *qp, u32 aeth)
+{
+ u32 credit = (aeth >> QIB_AETH_CREDIT_SHIFT) & QIB_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 == QIB_AETH_CREDIT_INVAL) {
+ if (!(qp->s_flags & QIB_S_UNLIMITED_CREDIT)) {
+ qp->s_flags |= QIB_S_UNLIMITED_CREDIT;
+ if (qp->s_flags & QIB_S_WAIT_SSN_CREDIT) {
+ qp->s_flags &= ~QIB_S_WAIT_SSN_CREDIT;
+ qib_schedule_send(qp);
+ }
+ }
+ } else if (!(qp->s_flags & QIB_S_UNLIMITED_CREDIT)) {
+ /* Compute new LSN (i.e., MSN + credit) */
+ credit = (aeth + credit_table[credit]) & QIB_MSN_MASK;
+ if (qib_cmp24(credit, qp->s_lsn) > 0) {
+ qp->s_lsn = credit;
+ if (qp->s_flags & QIB_S_WAIT_SSN_CREDIT) {
+ qp->s_flags &= ~QIB_S_WAIT_SSN_CREDIT;
+ qib_schedule_send(qp);
+ }
+ }
+ }