RDMA/cxgb3: Add driver for Chelsio T3 RNIC

Add an RDMA/iWARP driver for the Chelsio T3 1GbE and 10GbE adapters.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 1280 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/cxgb3/cxio_hal.c b/drivers/infiniband/hw/cxgb3/cxio_hal.c
new file mode 100644
index 000000000000..82fa72041989
--- /dev/null
+++ b/drivers/infiniband/hw/cxgb3/cxio_hal.c
@@ -0,0 +1,1280 @@
+/*
+ * Copyright (c) 2006 Chelsio, Inc. All rights reserved.
+ * Copyright (c) 2006 Open Grid Computing, 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 <asm/delay.h>
+
+#include <linux/mutex.h>
+#include <linux/netdevice.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/pci.h>
+
+#include "cxio_resource.h"
+#include "cxio_hal.h"
+#include "cxgb3_offload.h"
+#include "sge_defs.h"
+
+static LIST_HEAD(rdev_list);
+static cxio_hal_ev_callback_func_t cxio_ev_cb = NULL;
+
+static inline struct cxio_rdev *cxio_hal_find_rdev_by_name(char *dev_name)
+{
+        struct cxio_rdev *rdev;
+
+        list_for_each_entry(rdev, &rdev_list, entry)
+                if (!strcmp(rdev->dev_name, dev_name))
+                        return rdev;
+        return NULL;
+}
+
+static inline struct cxio_rdev *cxio_hal_find_rdev_by_t3cdev(struct t3cdev
+                                                             *tdev)
+{
+        struct cxio_rdev *rdev;
+
+        list_for_each_entry(rdev, &rdev_list, entry)
+                if (rdev->t3cdev_p == tdev)
+                        return rdev;
+        return NULL;
+}
+
+int cxio_hal_cq_op(struct cxio_rdev *rdev_p, struct t3_cq *cq,
+                   enum t3_cq_opcode op, u32 credit)
+{
+        int ret;
+        struct t3_cqe *cqe;
+        u32 rptr;
+
+        struct rdma_cq_op setup;
+        setup.id = cq->cqid;
+        setup.credits = (op == CQ_CREDIT_UPDATE) ? credit : 0;
+        setup.op = op;
+        ret = rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_OP, &setup);
+
+        if ((ret < 0) || (op == CQ_CREDIT_UPDATE))
+                return ret;
+
+        /*
+         * If the rearm returned an index other than our current index,
+         * then there might be CQE's in flight (being DMA'd).  We must wait
+         * here for them to complete or the consumer can miss a notification.
+         */
+        if (Q_PTR2IDX((cq->rptr), cq->size_log2) != ret) {
+                int i=0;
+
+                rptr = cq->rptr;
+
+                /*
+                 * Keep the generation correct by bumping rptr until it
+                 * matches the index returned by the rearm - 1.
+                 */
+                while (Q_PTR2IDX((rptr+1), cq->size_log2) != ret)
+                        rptr++;
+
+                /*
+                 * Now rptr is the index for the (last) cqe that was
+                 * in-flight at the time the HW rearmed the CQ.  We
+                 * spin until that CQE is valid.
+                 */
+                cqe = cq->queue + Q_PTR2IDX(rptr, cq->size_log2);
+                while (!CQ_VLD_ENTRY(rptr, cq->size_log2, cqe)) {
+                        udelay(1);
+                        if (i++ > 1000000) {
+                                BUG_ON(1);
+                                printk(KERN_ERR "%s: stalled rnic\n",
+                                       rdev_p->dev_name);
+                                return -EIO;
+                        }
+                }
+        }
+        return 0;
+}
+
+static inline int cxio_hal_clear_cq_ctx(struct cxio_rdev *rdev_p, u32 cqid)
+{
+        struct rdma_cq_setup setup;
+        setup.id = cqid;
+        setup.base_addr = 0;    /* NULL address */
+        setup.size = 0;         /* disaable the CQ */
+        setup.credits = 0;
+        setup.credit_thres = 0;
+        setup.ovfl_mode = 0;
+        return (rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_SETUP, &setup));
+}
+
+int cxio_hal_clear_qp_ctx(struct cxio_rdev *rdev_p, u32 qpid)
+{
+        u64 sge_cmd;
+        struct t3_modify_qp_wr *wqe;
+        struct sk_buff *skb = alloc_skb(sizeof(*wqe), GFP_KERNEL);
+        if (!skb) {
+                PDBG("%s alloc_skb failed\n", __FUNCTION__);
+                return -ENOMEM;
+        }
+        wqe = (struct t3_modify_qp_wr *) skb_put(skb, sizeof(*wqe));
+        memset(wqe, 0, sizeof(*wqe));
+        build_fw_riwrh((struct fw_riwrh *) wqe, T3_WR_QP_MOD, 3, 1, qpid, 7);
+        wqe->flags = cpu_to_be32(MODQP_WRITE_EC);
+        sge_cmd = qpid << 8 | 3;
+        wqe->sge_cmd = cpu_to_be64(sge_cmd);
+        skb->priority = CPL_PRIORITY_CONTROL;
+        return (cxgb3_ofld_send(rdev_p->t3cdev_p, skb));
+}
+
+int cxio_create_cq(struct cxio_rdev *rdev_p, struct t3_cq *cq)
+{
+        struct rdma_cq_setup setup;
+        int size = (1UL << (cq->size_log2)) * sizeof(struct t3_cqe);
+
+        cq->cqid = cxio_hal_get_cqid(rdev_p->rscp);
+        if (!cq->cqid)
+                return -ENOMEM;
+        cq->sw_queue = kzalloc(size, GFP_KERNEL);
+        if (!cq->sw_queue)
+                return -ENOMEM;
+        cq->queue = dma_alloc_coherent(&(rdev_p->rnic_info.pdev->dev),
+                                             (1UL << (cq->size_log2)) *
+                                             sizeof(struct t3_cqe),
+                                             &(cq->dma_addr), GFP_KERNEL);
+        if (!cq->queue) {
+                kfree(cq->sw_queue);
+                return -ENOMEM;
+        }
+        pci_unmap_addr_set(cq, mapping, cq->dma_addr);
+        memset(cq->queue, 0, size);
+        setup.id = cq->cqid;
+        setup.base_addr = (u64) (cq->dma_addr);
+        setup.size = 1UL << cq->size_log2;
+        setup.credits = 65535;
+        setup.credit_thres = 1;
+        if (rdev_p->t3cdev_p->type == T3B)
+                setup.ovfl_mode = 0;
+        else
+                setup.ovfl_mode = 1;
+        return (rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_SETUP, &setup));
+}
+
+int cxio_resize_cq(struct cxio_rdev *rdev_p, struct t3_cq *cq)
+{
+        struct rdma_cq_setup setup;
+        setup.id = cq->cqid;
+        setup.base_addr = (u64) (cq->dma_addr);
+        setup.size = 1UL << cq->size_log2;
+        setup.credits = setup.size;
+        setup.credit_thres = setup.size;        /* TBD: overflow recovery */
+        setup.ovfl_mode = 1;
+        return (rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_SETUP, &setup));
+}
+
+static u32 get_qpid(struct cxio_rdev *rdev_p, struct cxio_ucontext *uctx)
+{
+        struct cxio_qpid_list *entry;
+        u32 qpid;
+        int i;
+
+        mutex_lock(&uctx->lock);
+        if (!list_empty(&uctx->qpids)) {
+                entry = list_entry(uctx->qpids.next, struct cxio_qpid_list,
+                                   entry);
+                list_del(&entry->entry);
+                qpid = entry->qpid;
+                kfree(entry);
+        } else {
+                qpid = cxio_hal_get_qpid(rdev_p->rscp);
+                if (!qpid)
+                        goto out;
+                for (i = qpid+1; i & rdev_p->qpmask; i++) {
+                        entry = kmalloc(sizeof *entry, GFP_KERNEL);
+                        if (!entry)
+                                break;
+                        entry->qpid = i;
+                        list_add_tail(&entry->entry, &uctx->qpids);
+                }
+        }
+out:
+        mutex_unlock(&uctx->lock);
+        PDBG("%s qpid 0x%x\n", __FUNCTION__, qpid);
+        return qpid;
+}
+
+static void put_qpid(struct cxio_rdev *rdev_p, u32 qpid,
+                     struct cxio_ucontext *uctx)
+{
+        struct cxio_qpid_list *entry;
+
+        entry = kmalloc(sizeof *entry, GFP_KERNEL);
+        if (!entry)
+                return;
+        PDBG("%s qpid 0x%x\n", __FUNCTION__, qpid);
+        entry->qpid = qpid;
+        mutex_lock(&uctx->lock);
+        list_add_tail(&entry->entry, &uctx->qpids);
+        mutex_unlock(&uctx->lock);
+}
+
+void cxio_release_ucontext(struct cxio_rdev *rdev_p, struct cxio_ucontext *uctx)
+{
+        struct list_head *pos, *nxt;
+        struct cxio_qpid_list *entry;
+
+        mutex_lock(&uctx->lock);
+        list_for_each_safe(pos, nxt, &uctx->qpids) {
+                entry = list_entry(pos, struct cxio_qpid_list, entry);
+                list_del_init(&entry->entry);
+                if (!(entry->qpid & rdev_p->qpmask))
+                        cxio_hal_put_qpid(rdev_p->rscp, entry->qpid);
+                kfree(entry);
+        }
+        mutex_unlock(&uctx->lock);
+}
+
+void cxio_init_ucontext(struct cxio_rdev *rdev_p, struct cxio_ucontext *uctx)
+{
+        INIT_LIST_HEAD(&uctx->qpids);
+        mutex_init(&uctx->lock);
+}
+
+int cxio_create_qp(struct cxio_rdev *rdev_p, u32 kernel_domain,
+                   struct t3_wq *wq, struct cxio_ucontext *uctx)
+{
+        int depth = 1UL << wq->size_log2;
+        int rqsize = 1UL << wq->rq_size_log2;
+
+        wq->qpid = get_qpid(rdev_p, uctx);
+        if (!wq->qpid)
+                return -ENOMEM;
+
+        wq->rq = kzalloc(depth * sizeof(u64), GFP_KERNEL);
+        if (!wq->rq)
+                goto err1;
+
+        wq->rq_addr = cxio_hal_rqtpool_alloc(rdev_p, rqsize);
+        if (!wq->rq_addr)
+                goto err2;
+
+        wq->sq = kzalloc(depth * sizeof(struct t3_swsq), GFP_KERNEL);
+        if (!wq->sq)
+                goto err3;
+
+        wq->queue = dma_alloc_coherent(&(rdev_p->rnic_info.pdev->dev),
+                                             depth * sizeof(union t3_wr),
+                                             &(wq->dma_addr), GFP_KERNEL);
+        if (!wq->queue)
+                goto err4;
+
+        memset(wq->queue, 0, depth * sizeof(union t3_wr));
+        pci_unmap_addr_set(wq, mapping, wq->dma_addr);
+        wq->doorbell = (void __iomem *)rdev_p->rnic_info.kdb_addr;
+        if (!kernel_domain)
+                wq->udb = (u64)rdev_p->rnic_info.udbell_physbase +
+                                        (wq->qpid << rdev_p->qpshift);
+        PDBG("%s qpid 0x%x doorbell 0x%p udb 0x%llx\n", __FUNCTION__,
+             wq->qpid, wq->doorbell, (unsigned long long) wq->udb);
+        return 0;
+err4:
+        kfree(wq->sq);
+err3:
+        cxio_hal_rqtpool_free(rdev_p, wq->rq_addr, rqsize);
+err2:
+        kfree(wq->rq);
+err1:
+        put_qpid(rdev_p, wq->qpid, uctx);
+        return -ENOMEM;
+}
+
+int cxio_destroy_cq(struct cxio_rdev *rdev_p, struct t3_cq *cq)
+{
+        int err;
+        err = cxio_hal_clear_cq_ctx(rdev_p, cq->cqid);
+        kfree(cq->sw_queue);
+        dma_free_coherent(&(rdev_p->rnic_info.pdev->dev),
+                          (1UL << (cq->size_log2))
+                          * sizeof(struct t3_cqe), cq->queue,
+                          pci_unmap_addr(cq, mapping));
+        cxio_hal_put_cqid(rdev_p->rscp, cq->cqid);
+        return err;
+}
+
+int cxio_destroy_qp(struct cxio_rdev *rdev_p, struct t3_wq *wq,
+                    struct cxio_ucontext *uctx)
+{
+        dma_free_coherent(&(rdev_p->rnic_info.pdev->dev),
+                          (1UL << (wq->size_log2))
+                          * sizeof(union t3_wr), wq->queue,
+                          pci_unmap_addr(wq, mapping));
+        kfree(wq->sq);
+        cxio_hal_rqtpool_free(rdev_p, wq->rq_addr, (1UL << wq->rq_size_log2));
+        kfree(wq->rq);
+        put_qpid(rdev_p, wq->qpid, uctx);
+        return 0;
+}
+
+static void insert_recv_cqe(struct t3_wq *wq, struct t3_cq *cq)
+{
+        struct t3_cqe cqe;
+
+        PDBG("%s wq %p cq %p sw_rptr 0x%x sw_wptr 0x%x\n", __FUNCTION__,
+             wq, cq, cq->sw_rptr, cq->sw_wptr);
+        memset(&cqe, 0, sizeof(cqe));
+        cqe.header = cpu_to_be32(V_CQE_STATUS(TPT_ERR_SWFLUSH) |
+                                 V_CQE_OPCODE(T3_SEND) |
+                                 V_CQE_TYPE(0) |
+                                 V_CQE_SWCQE(1) |
+                                 V_CQE_QPID(wq->qpid) |
+                                 V_CQE_GENBIT(Q_GENBIT(cq->sw_wptr,
+                                                       cq->size_log2)));
+        *(cq->sw_queue + Q_PTR2IDX(cq->sw_wptr, cq->size_log2)) = cqe;
+        cq->sw_wptr++;
+}
+
+void cxio_flush_rq(struct t3_wq *wq, struct t3_cq *cq, int count)
+{
+        u32 ptr;
+
+        PDBG("%s wq %p cq %p\n", __FUNCTION__, wq, cq);
+
+        /* flush RQ */
+        PDBG("%s rq_rptr %u rq_wptr %u skip count %u\n", __FUNCTION__,
+            wq->rq_rptr, wq->rq_wptr, count);
+        ptr = wq->rq_rptr + count;
+        while (ptr++ != wq->rq_wptr)
+                insert_recv_cqe(wq, cq);
+}
+
+static void insert_sq_cqe(struct t3_wq *wq, struct t3_cq *cq,
+                          struct t3_swsq *sqp)
+{
+        struct t3_cqe cqe;
+
+        PDBG("%s wq %p cq %p sw_rptr 0x%x sw_wptr 0x%x\n", __FUNCTION__,
+             wq, cq, cq->sw_rptr, cq->sw_wptr);
+        memset(&cqe, 0, sizeof(cqe));
+        cqe.header = cpu_to_be32(V_CQE_STATUS(TPT_ERR_SWFLUSH) |
+                                 V_CQE_OPCODE(sqp->opcode) |
+                                 V_CQE_TYPE(1) |
+                                 V_CQE_SWCQE(1) |
+                                 V_CQE_QPID(wq->qpid) |
+                                 V_CQE_GENBIT(Q_GENBIT(cq->sw_wptr,
+                                                       cq->size_log2)));
+        cqe.u.scqe.wrid_hi = sqp->sq_wptr;
+
+        *(cq->sw_queue + Q_PTR2IDX(cq->sw_wptr, cq->size_log2)) = cqe;
+        cq->sw_wptr++;
+}
+
+void cxio_flush_sq(struct t3_wq *wq, struct t3_cq *cq, int count)
+{
+        __u32 ptr;
+        struct t3_swsq *sqp = wq->sq + Q_PTR2IDX(wq->sq_rptr, wq->sq_size_log2);
+
+        ptr = wq->sq_rptr + count;
+        sqp += count;
+        while (ptr != wq->sq_wptr) {
+                insert_sq_cqe(wq, cq, sqp);
+                sqp++;
+                ptr++;
+        }
+}
+
+/*
+ * Move all CQEs from the HWCQ into the SWCQ.
+ */
+void cxio_flush_hw_cq(struct t3_cq *cq)
+{
+        struct t3_cqe *cqe, *swcqe;
+
+        PDBG("%s cq %p cqid 0x%x\n", __FUNCTION__, cq, cq->cqid);
+        cqe = cxio_next_hw_cqe(cq);
+        while (cqe) {
+                PDBG("%s flushing hwcq rptr 0x%x to swcq wptr 0x%x\n",
+                     __FUNCTION__, cq->rptr, cq->sw_wptr);
+                swcqe = cq->sw_queue + Q_PTR2IDX(cq->sw_wptr, cq->size_log2);
+                *swcqe = *cqe;
+                swcqe->header |= cpu_to_be32(V_CQE_SWCQE(1));
+                cq->sw_wptr++;
+                cq->rptr++;
+                cqe = cxio_next_hw_cqe(cq);
+        }
+}
+
+static inline int cqe_completes_wr(struct t3_cqe *cqe, struct t3_wq *wq)
+{
+        if (CQE_OPCODE(*cqe) == T3_TERMINATE)
+                return 0;
+
+        if ((CQE_OPCODE(*cqe) == T3_RDMA_WRITE) && RQ_TYPE(*cqe))
+                return 0;
+
+        if ((CQE_OPCODE(*cqe) == T3_READ_RESP) && SQ_TYPE(*cqe))
+                return 0;
+
+        if ((CQE_OPCODE(*cqe) == T3_SEND) && RQ_TYPE(*cqe) &&
+            Q_EMPTY(wq->rq_rptr, wq->rq_wptr))
+                return 0;
+
+        return 1;
+}
+
+void cxio_count_scqes(struct t3_cq *cq, struct t3_wq *wq, int *count)
+{
+        struct t3_cqe *cqe;
+        u32 ptr;
+
+        *count = 0;
+        ptr = cq->sw_rptr;
+        while (!Q_EMPTY(ptr, cq->sw_wptr)) {
+                cqe = cq->sw_queue + (Q_PTR2IDX(ptr, cq->size_log2));
+                if ((SQ_TYPE(*cqe) || (CQE_OPCODE(*cqe) == T3_READ_RESP)) &&
+                    (CQE_QPID(*cqe) == wq->qpid))
+                        (*count)++;
+                ptr++;
+        }
+        PDBG("%s cq %p count %d\n", __FUNCTION__, cq, *count);
+}
+
+void cxio_count_rcqes(struct t3_cq *cq, struct t3_wq *wq, int *count)
+{
+        struct t3_cqe *cqe;
+        u32 ptr;
+
+        *count = 0;
+        PDBG("%s count zero %d\n", __FUNCTION__, *count);
+        ptr = cq->sw_rptr;
+        while (!Q_EMPTY(ptr, cq->sw_wptr)) {
+                cqe = cq->sw_queue + (Q_PTR2IDX(ptr, cq->size_log2));
+                if (RQ_TYPE(*cqe) && (CQE_OPCODE(*cqe) != T3_READ_RESP) &&
+                    (CQE_QPID(*cqe) == wq->qpid) && cqe_completes_wr(cqe, wq))
+                        (*count)++;
+                ptr++;
+        }
+        PDBG("%s cq %p count %d\n", __FUNCTION__, cq, *count);
+}
+
+static int cxio_hal_init_ctrl_cq(struct cxio_rdev *rdev_p)
+{
+        struct rdma_cq_setup setup;
+        setup.id = 0;
+        setup.base_addr = 0;    /* NULL address */
+        setup.size = 1;         /* enable the CQ */
+        setup.credits = 0;
+
+        /* force SGE to redirect to RspQ and interrupt */
+        setup.credit_thres = 0;
+        setup.ovfl_mode = 1;
+        return (rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_CQ_SETUP, &setup));
+}
+
+static int cxio_hal_init_ctrl_qp(struct cxio_rdev *rdev_p)
+{
+        int err;
+        u64 sge_cmd, ctx0, ctx1;
+        u64 base_addr;
+        struct t3_modify_qp_wr *wqe;
+        struct sk_buff *skb = alloc_skb(sizeof(*wqe), GFP_KERNEL);
+
+
+        if (!skb) {
+                PDBG("%s alloc_skb failed\n", __FUNCTION__);
+                return -ENOMEM;
+        }
+        err = cxio_hal_init_ctrl_cq(rdev_p);
+        if (err) {
+                PDBG("%s err %d initializing ctrl_cq\n", __FUNCTION__, err);
+                return err;
+        }
+        rdev_p->ctrl_qp.workq = dma_alloc_coherent(
+                                        &(rdev_p->rnic_info.pdev->dev),
+                                        (1 << T3_CTRL_QP_SIZE_LOG2) *
+                                        sizeof(union t3_wr),
+                                        &(rdev_p->ctrl_qp.dma_addr),
+                                        GFP_KERNEL);
+        if (!rdev_p->ctrl_qp.workq) {
+                PDBG("%s dma_alloc_coherent failed\n", __FUNCTION__);
+                return -ENOMEM;
+        }
+        pci_unmap_addr_set(&rdev_p->ctrl_qp, mapping,
+                           rdev_p->ctrl_qp.dma_addr);
+        rdev_p->ctrl_qp.doorbell = (void __iomem *)rdev_p->rnic_info.kdb_addr;
+        memset(rdev_p->ctrl_qp.workq, 0,
+               (1 << T3_CTRL_QP_SIZE_LOG2) * sizeof(union t3_wr));
+
+        mutex_init(&rdev_p->ctrl_qp.lock);
+        init_waitqueue_head(&rdev_p->ctrl_qp.waitq);
+
+        /* update HW Ctrl QP context */
+        base_addr = rdev_p->ctrl_qp.dma_addr;
+        base_addr >>= 12;
+        ctx0 = (V_EC_SIZE((1 << T3_CTRL_QP_SIZE_LOG2)) |
+                V_EC_BASE_LO((u32) base_addr & 0xffff));
+        ctx0 <<= 32;
+        ctx0 |= V_EC_CREDITS(FW_WR_NUM);
+        base_addr >>= 16;
+        ctx1 = (u32) base_addr;
+        base_addr >>= 32;
+        ctx1 |= ((u64) (V_EC_BASE_HI((u32) base_addr & 0xf) | V_EC_RESPQ(0) |
+                        V_EC_TYPE(0) | V_EC_GEN(1) |
+                        V_EC_UP_TOKEN(T3_CTL_QP_TID) | F_EC_VALID)) << 32;
+        wqe = (struct t3_modify_qp_wr *) skb_put(skb, sizeof(*wqe));
+        memset(wqe, 0, sizeof(*wqe));
+        build_fw_riwrh((struct fw_riwrh *) wqe, T3_WR_QP_MOD, 0, 1,
+                       T3_CTL_QP_TID, 7);
+        wqe->flags = cpu_to_be32(MODQP_WRITE_EC);
+        sge_cmd = (3ULL << 56) | FW_RI_SGEEC_START << 8 | 3;
+        wqe->sge_cmd = cpu_to_be64(sge_cmd);
+        wqe->ctx1 = cpu_to_be64(ctx1);
+        wqe->ctx0 = cpu_to_be64(ctx0);
+        PDBG("CtrlQP dma_addr 0x%llx workq %p size %d\n",
+             (unsigned long long) rdev_p->ctrl_qp.dma_addr,
+             rdev_p->ctrl_qp.workq, 1 << T3_CTRL_QP_SIZE_LOG2);
+        skb->priority = CPL_PRIORITY_CONTROL;
+        return (cxgb3_ofld_send(rdev_p->t3cdev_p, skb));
+}
+
+static int cxio_hal_destroy_ctrl_qp(struct cxio_rdev *rdev_p)
+{
+        dma_free_coherent(&(rdev_p->rnic_info.pdev->dev),
+                          (1UL << T3_CTRL_QP_SIZE_LOG2)
+                          * sizeof(union t3_wr), rdev_p->ctrl_qp.workq,
+                          pci_unmap_addr(&rdev_p->ctrl_qp, mapping));
+        return cxio_hal_clear_qp_ctx(rdev_p, T3_CTRL_QP_ID);
+}
+
+/* write len bytes of data into addr (32B aligned address)
+ * If data is NULL, clear len byte of memory to zero.
+ * caller aquires the ctrl_qp lock before the call
+ */
+static int cxio_hal_ctrl_qp_write_mem(struct cxio_rdev *rdev_p, u32 addr,
+                                      u32 len, void *data, int completion)
+{
+        u32 i, nr_wqe, copy_len;
+        u8 *copy_data;
+        u8 wr_len, utx_len;     /* lenght in 8 byte flit */
+        enum t3_wr_flags flag;
+        __be64 *wqe;
+        u64 utx_cmd;
+        addr &= 0x7FFFFFF;
+        nr_wqe = len % 96 ? len / 96 + 1 : len / 96;    /* 96B max per WQE */
+        PDBG("%s wptr 0x%x rptr 0x%x len %d, nr_wqe %d data %p addr 0x%0x\n",
+             __FUNCTION__, rdev_p->ctrl_qp.wptr, rdev_p->ctrl_qp.rptr, len,
+             nr_wqe, data, addr);
+        utx_len = 3;            /* in 32B unit */
+        for (i = 0; i < nr_wqe; i++) {
+                if (Q_FULL(rdev_p->ctrl_qp.rptr, rdev_p->ctrl_qp.wptr,
+                           T3_CTRL_QP_SIZE_LOG2)) {
+                        PDBG("%s ctrl_qp full wtpr 0x%0x rptr 0x%0x, "
+                             "wait for more space i %d\n", __FUNCTION__,
+                             rdev_p->ctrl_qp.wptr, rdev_p->ctrl_qp.rptr, i);
+                        if (wait_event_interruptible(rdev_p->ctrl_qp.waitq,
+                                             !Q_FULL(rdev_p->ctrl_qp.rptr,
+                                                     rdev_p->ctrl_qp.wptr,
+                                                     T3_CTRL_QP_SIZE_LOG2))) {
+                                PDBG("%s ctrl_qp workq interrupted\n",
+                                     __FUNCTION__);
+                                return -ERESTARTSYS;
+                        }
+                        PDBG("%s ctrl_qp wakeup, continue posting work request "
+                             "i %d\n", __FUNCTION__, i);
+                }
+                wqe = (__be64 *)(rdev_p->ctrl_qp.workq + (rdev_p->ctrl_qp.wptr %
+                                                (1 << T3_CTRL_QP_SIZE_LOG2)));
+                flag = 0;
+                if (i == (nr_wqe - 1)) {
+                        /* last WQE */
+                        flag = completion ? T3_COMPLETION_FLAG : 0;
+                        if (len % 32)
+                                utx_len = len / 32 + 1;
+                        else
+                                utx_len = len / 32;
+                }
+
+                /*
+                 * Force a CQE to return the credit to the workq in case
+                 * we posted more than half the max QP size of WRs
+                 */
+                if ((i != 0) &&
+                    (i % (((1 << T3_CTRL_QP_SIZE_LOG2)) >> 1) == 0)) {
+                        flag = T3_COMPLETION_FLAG;
+                        PDBG("%s force completion at i %d\n", __FUNCTION__, i);
+                }
+
+                /* build the utx mem command */
+                wqe += (sizeof(struct t3_bypass_wr) >> 3);
+                utx_cmd = (T3_UTX_MEM_WRITE << 28) | (addr + i * 3);
+                utx_cmd <<= 32;
+                utx_cmd |= (utx_len << 28) | ((utx_len << 2) + 1);
+                *wqe = cpu_to_be64(utx_cmd);
+                wqe++;
+                copy_data = (u8 *) data + i * 96;
+                copy_len = len > 96 ? 96 : len;
+
+                /* clear memory content if data is NULL */
+                if (data)
+                        memcpy(wqe, copy_data, copy_len);
+                else
+                        memset(wqe, 0, copy_len);
+                if (copy_len % 32)
+                        memset(((u8 *) wqe) + copy_len, 0,
+                               32 - (copy_len % 32));
+                wr_len = ((sizeof(struct t3_bypass_wr)) >> 3) + 1 +
+                         (utx_len << 2);
+                wqe = (__be64 *)(rdev_p->ctrl_qp.workq + (rdev_p->ctrl_qp.wptr %
+                              (1 << T3_CTRL_QP_SIZE_LOG2)));
+
+                /* wptr in the WRID[31:0] */
+                ((union t3_wrid *)(wqe+1))->id0.low = rdev_p->ctrl_qp.wptr;
+
+                /*
+                 * This must be the last write with a memory barrier
+                 * for the genbit
+                 */
+                build_fw_riwrh((struct fw_riwrh *) wqe, T3_WR_BP, flag,
+                               Q_GENBIT(rdev_p->ctrl_qp.wptr,
+                                        T3_CTRL_QP_SIZE_LOG2), T3_CTRL_QP_ID,
+                               wr_len);
+                if (flag == T3_COMPLETION_FLAG)
+                        ring_doorbell(rdev_p->ctrl_qp.doorbell, T3_CTRL_QP_ID);
+                len -= 96;
+                rdev_p->ctrl_qp.wptr++;
+        }
+        return 0;
+}
+
+/* IN: stag key, pdid, perm, zbva, to, len, page_size, pbl, and pbl_size
+ * OUT: stag index, actual pbl_size, pbl_addr allocated.
+ * TBD: shared memory region support
+ */
+static int __cxio_tpt_op(struct cxio_rdev *rdev_p, u32 reset_tpt_entry,
+                         u32 *stag, u8 stag_state, u32 pdid,
+                         enum tpt_mem_type type, enum tpt_mem_perm perm,
+                         u32 zbva, u64 to, u32 len, u8 page_size, __be64 *pbl,
+                         u32 *pbl_size, u32 *pbl_addr)
+{
+        int err;
+        struct tpt_entry tpt;
+        u32 stag_idx;
+        u32 wptr;
+        int rereg = (*stag != T3_STAG_UNSET);
+
+        stag_state = stag_state > 0;
+        stag_idx = (*stag) >> 8;
+
+        if ((!reset_tpt_entry) && !(*stag != T3_STAG_UNSET)) {
+                stag_idx = cxio_hal_get_stag(rdev_p->rscp);
+                if (!stag_idx)
+                        return -ENOMEM;
+                *stag = (stag_idx << 8) | ((*stag) & 0xFF);
+        }
+        PDBG("%s stag_state 0x%0x type 0x%0x pdid 0x%0x, stag_idx 0x%x\n",
+             __FUNCTION__, stag_state, type, pdid, stag_idx);
+
+        if (reset_tpt_entry)
+                cxio_hal_pblpool_free(rdev_p, *pbl_addr, *pbl_size << 3);
+        else if (!rereg) {
+                *pbl_addr = cxio_hal_pblpool_alloc(rdev_p, *pbl_size << 3);
+                if (!*pbl_addr) {
+                        return -ENOMEM;
+                }
+        }
+
+        mutex_lock(&rdev_p->ctrl_qp.lock);
+
+        /* write PBL first if any - update pbl only if pbl list exist */
+        if (pbl) {
+
+                PDBG("%s *pdb_addr 0x%x, pbl_base 0x%x, pbl_size %d\n",
+                     __FUNCTION__, *pbl_addr, rdev_p->rnic_info.pbl_base,
+                     *pbl_size);
+                err = cxio_hal_ctrl_qp_write_mem(rdev_p,
+                                (*pbl_addr >> 5),
+                                (*pbl_size << 3), pbl, 0);
+                if (err)
+                        goto ret;
+        }
+
+        /* write TPT entry */
+        if (reset_tpt_entry)
+                memset(&tpt, 0, sizeof(tpt));
+        else {
+                tpt.valid_stag_pdid = cpu_to_be32(F_TPT_VALID |
+                                V_TPT_STAG_KEY((*stag) & M_TPT_STAG_KEY) |
+                                V_TPT_STAG_STATE(stag_state) |
+                                V_TPT_STAG_TYPE(type) | V_TPT_PDID(pdid));
+                BUG_ON(page_size >= 28);
+                tpt.flags_pagesize_qpid = cpu_to_be32(V_TPT_PERM(perm) |
+                                F_TPT_MW_BIND_ENABLE |
+                                V_TPT_ADDR_TYPE((zbva ? TPT_ZBTO : TPT_VATO)) |
+                                V_TPT_PAGE_SIZE(page_size));
+                tpt.rsvd_pbl_addr = reset_tpt_entry ? 0 :
+                                    cpu_to_be32(V_TPT_PBL_ADDR(PBL_OFF(rdev_p, *pbl_addr)>>3));
+                tpt.len = cpu_to_be32(len);
+                tpt.va_hi = cpu_to_be32((u32) (to >> 32));
+                tpt.va_low_or_fbo = cpu_to_be32((u32) (to & 0xFFFFFFFFULL));
+                tpt.rsvd_bind_cnt_or_pstag = 0;
+                tpt.rsvd_pbl_size = reset_tpt_entry ? 0 :
+                                  cpu_to_be32(V_TPT_PBL_SIZE((*pbl_size) >> 2));
+        }
+        err = cxio_hal_ctrl_qp_write_mem(rdev_p,
+                                       stag_idx +
+                                       (rdev_p->rnic_info.tpt_base >> 5),
+                                       sizeof(tpt), &tpt, 1);
+
+        /* release the stag index to free pool */
+        if (reset_tpt_entry)
+                cxio_hal_put_stag(rdev_p->rscp, stag_idx);
+ret:
+        wptr = rdev_p->ctrl_qp.wptr;
+        mutex_unlock(&rdev_p->ctrl_qp.lock);
+        if (!err)
+                if (wait_event_interruptible(rdev_p->ctrl_qp.waitq,
+                                             SEQ32_GE(rdev_p->ctrl_qp.rptr,
+                                                      wptr)))
+                        return -ERESTARTSYS;
+        return err;
+}
+
+/* IN : stag key, pdid, pbl_size
+ * Out: stag index, actaul pbl_size, and pbl_addr allocated.
+ */
+int cxio_allocate_stag(struct cxio_rdev *rdev_p, u32 * stag, u32 pdid,
+                       enum tpt_mem_perm perm, u32 * pbl_size, u32 * pbl_addr)
+{
+        *stag = T3_STAG_UNSET;
+        return (__cxio_tpt_op(rdev_p, 0, stag, 0, pdid, TPT_NON_SHARED_MR,
+                              perm, 0, 0ULL, 0, 0, NULL, pbl_size, pbl_addr));
+}
+
+int cxio_register_phys_mem(struct cxio_rdev *rdev_p, u32 *stag, u32 pdid,
+                           enum tpt_mem_perm perm, u32 zbva, u64 to, u32 len,
+                           u8 page_size, __be64 *pbl, u32 *pbl_size,
+                           u32 *pbl_addr)
+{
+        *stag = T3_STAG_UNSET;
+        return __cxio_tpt_op(rdev_p, 0, stag, 1, pdid, TPT_NON_SHARED_MR, perm,
+                             zbva, to, len, page_size, pbl, pbl_size, pbl_addr);
+}
+
+int cxio_reregister_phys_mem(struct cxio_rdev *rdev_p, u32 *stag, u32 pdid,
+                           enum tpt_mem_perm perm, u32 zbva, u64 to, u32 len,
+                           u8 page_size, __be64 *pbl, u32 *pbl_size,
+                           u32 *pbl_addr)
+{
+        return __cxio_tpt_op(rdev_p, 0, stag, 1, pdid, TPT_NON_SHARED_MR, perm,
+                             zbva, to, len, page_size, pbl, pbl_size, pbl_addr);
+}
+
+int cxio_dereg_mem(struct cxio_rdev *rdev_p, u32 stag, u32 pbl_size,
+                   u32 pbl_addr)
+{
+        return __cxio_tpt_op(rdev_p, 1, &stag, 0, 0, 0, 0, 0, 0ULL, 0, 0, NULL,
+                             &pbl_size, &pbl_addr);
+}
+
+int cxio_allocate_window(struct cxio_rdev *rdev_p, u32 * stag, u32 pdid)
+{
+        u32 pbl_size = 0;
+        *stag = T3_STAG_UNSET;
+        return __cxio_tpt_op(rdev_p, 0, stag, 0, pdid, TPT_MW, 0, 0, 0ULL, 0, 0,
+                             NULL, &pbl_size, NULL);
+}
+
+int cxio_deallocate_window(struct cxio_rdev *rdev_p, u32 stag)
+{
+        return __cxio_tpt_op(rdev_p, 1, &stag, 0, 0, 0, 0, 0, 0ULL, 0, 0, NULL,
+                             NULL, NULL);
+}
+
+int cxio_rdma_init(struct cxio_rdev *rdev_p, struct t3_rdma_init_attr *attr)
+{
+        struct t3_rdma_init_wr *wqe;
+        struct sk_buff *skb = alloc_skb(sizeof(*wqe), GFP_ATOMIC);
+        if (!skb)
+                return -ENOMEM;
+        PDBG("%s rdev_p %p\n", __FUNCTION__, rdev_p);
+        wqe = (struct t3_rdma_init_wr *) __skb_put(skb, sizeof(*wqe));
+        wqe->wrh.op_seop_flags = cpu_to_be32(V_FW_RIWR_OP(T3_WR_INIT));
+        wqe->wrh.gen_tid_len = cpu_to_be32(V_FW_RIWR_TID(attr->tid) |
+                                           V_FW_RIWR_LEN(sizeof(*wqe) >> 3));
+        wqe->wrid.id1 = 0;
+        wqe->qpid = cpu_to_be32(attr->qpid);
+        wqe->pdid = cpu_to_be32(attr->pdid);
+        wqe->scqid = cpu_to_be32(attr->scqid);
+        wqe->rcqid = cpu_to_be32(attr->rcqid);
+        wqe->rq_addr = cpu_to_be32(attr->rq_addr - rdev_p->rnic_info.rqt_base);
+        wqe->rq_size = cpu_to_be32(attr->rq_size);
+        wqe->mpaattrs = attr->mpaattrs;
+        wqe->qpcaps = attr->qpcaps;
+        wqe->ulpdu_size = cpu_to_be16(attr->tcp_emss);
+        wqe->flags = cpu_to_be32(attr->flags);
+        wqe->ord = cpu_to_be32(attr->ord);
+        wqe->ird = cpu_to_be32(attr->ird);
+        wqe->qp_dma_addr = cpu_to_be64(attr->qp_dma_addr);
+        wqe->qp_dma_size = cpu_to_be32(attr->qp_dma_size);
+        wqe->rsvd = 0;
+        skb->priority = 0;      /* 0=>ToeQ; 1=>CtrlQ */
+        return (cxgb3_ofld_send(rdev_p->t3cdev_p, skb));
+}
+
+void cxio_register_ev_cb(cxio_hal_ev_callback_func_t ev_cb)
+{
+        cxio_ev_cb = ev_cb;
+}
+
+void cxio_unregister_ev_cb(cxio_hal_ev_callback_func_t ev_cb)
+{
+        cxio_ev_cb = NULL;
+}
+
+static int cxio_hal_ev_handler(struct t3cdev *t3cdev_p, struct sk_buff *skb)
+{
+        static int cnt;
+        struct cxio_rdev *rdev_p = NULL;
+        struct respQ_msg_t *rsp_msg = (struct respQ_msg_t *) skb->data;
+        PDBG("%d: %s cq_id 0x%x cq_ptr 0x%x genbit %0x overflow %0x an %0x"
+             " se %0x notify %0x cqbranch %0x creditth %0x\n",
+             cnt, __FUNCTION__, RSPQ_CQID(rsp_msg), RSPQ_CQPTR(rsp_msg),
+             RSPQ_GENBIT(rsp_msg), RSPQ_OVERFLOW(rsp_msg), RSPQ_AN(rsp_msg),
+             RSPQ_SE(rsp_msg), RSPQ_NOTIFY(rsp_msg), RSPQ_CQBRANCH(rsp_msg),
+             RSPQ_CREDIT_THRESH(rsp_msg));
+        PDBG("CQE: QPID 0x%0x genbit %0x type 0x%0x status 0x%0x opcode %d "
+             "len 0x%0x wrid_hi_stag 0x%x wrid_low_msn 0x%x\n",
+             CQE_QPID(rsp_msg->cqe), CQE_GENBIT(rsp_msg->cqe),
+             CQE_TYPE(rsp_msg->cqe), CQE_STATUS(rsp_msg->cqe),
+             CQE_OPCODE(rsp_msg->cqe), CQE_LEN(rsp_msg->cqe),
+             CQE_WRID_HI(rsp_msg->cqe), CQE_WRID_LOW(rsp_msg->cqe));
+        rdev_p = (struct cxio_rdev *)t3cdev_p->ulp;
+        if (!rdev_p) {
+                PDBG("%s called by t3cdev %p with null ulp\n", __FUNCTION__,
+                     t3cdev_p);
+                return 0;
+        }
+        if (CQE_QPID(rsp_msg->cqe) == T3_CTRL_QP_ID) {
+                rdev_p->ctrl_qp.rptr = CQE_WRID_LOW(rsp_msg->cqe) + 1;
+                wake_up_interruptible(&rdev_p->ctrl_qp.waitq);
+                dev_kfree_skb_irq(skb);
+        } else if (CQE_QPID(rsp_msg->cqe) == 0xfff8)
+                dev_kfree_skb_irq(skb);
+        else if (cxio_ev_cb)
+                (*cxio_ev_cb) (rdev_p, skb);
+        else
+                dev_kfree_skb_irq(skb);
+        cnt++;
+        return 0;
+}
+
+/* Caller takes care of locking if needed */
+int cxio_rdev_open(struct cxio_rdev *rdev_p)
+{
+        struct net_device *netdev_p = NULL;
+        int err = 0;
+        if (strlen(rdev_p->dev_name)) {
+                if (cxio_hal_find_rdev_by_name(rdev_p->dev_name)) {
+                        return -EBUSY;
+                }
+                netdev_p = dev_get_by_name(rdev_p->dev_name);
+                if (!netdev_p) {
+                        return -EINVAL;
+                }
+                dev_put(netdev_p);
+        } else if (rdev_p->t3cdev_p) {
+                if (cxio_hal_find_rdev_by_t3cdev(rdev_p->t3cdev_p)) {
+                        return -EBUSY;
+                }
+                netdev_p = rdev_p->t3cdev_p->lldev;
+                strncpy(rdev_p->dev_name, rdev_p->t3cdev_p->name,
+                        T3_MAX_DEV_NAME_LEN);
+        } else {
+                PDBG("%s t3cdev_p or dev_name must be set\n", __FUNCTION__);
+                return -EINVAL;
+        }
+
+        list_add_tail(&rdev_p->entry, &rdev_list);
+
+        PDBG("%s opening rnic dev %s\n", __FUNCTION__, rdev_p->dev_name);
+        memset(&rdev_p->ctrl_qp, 0, sizeof(rdev_p->ctrl_qp));
+        if (!rdev_p->t3cdev_p)
+                rdev_p->t3cdev_p = T3CDEV(netdev_p);
+        rdev_p->t3cdev_p->ulp = (void *) rdev_p;
+        err = rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, RDMA_GET_PARAMS,
+                                         &(rdev_p->rnic_info));
+        if (err) {
+                printk(KERN_ERR "%s t3cdev_p(%p)->ctl returned error %d.\n",
+                     __FUNCTION__, rdev_p->t3cdev_p, err);
+                goto err1;
+        }
+        err = rdev_p->t3cdev_p->ctl(rdev_p->t3cdev_p, GET_PORTS,
+                                    &(rdev_p->port_info));
+        if (err) {
+                printk(KERN_ERR "%s t3cdev_p(%p)->ctl returned error %d.\n",
+                     __FUNCTION__, rdev_p->t3cdev_p, err);
+                goto err1;
+        }
+
+        /*
+         * qpshift is the number of bits to shift the qpid left in order
+         * to get the correct address of the doorbell for that qp.
+         */
+        cxio_init_ucontext(rdev_p, &rdev_p->uctx);
+        rdev_p->qpshift = PAGE_SHIFT -
+                          ilog2(65536 >>
+                                    ilog2(rdev_p->rnic_info.udbell_len >>
+                                              PAGE_SHIFT));
+        rdev_p->qpnr = rdev_p->rnic_info.udbell_len >> PAGE_SHIFT;
+        rdev_p->qpmask = (65536 >> ilog2(rdev_p->qpnr)) - 1;
+        PDBG("%s rnic %s info: tpt_base 0x%0x tpt_top 0x%0x num stags %d "
+             "pbl_base 0x%0x pbl_top 0x%0x rqt_base 0x%0x, rqt_top 0x%0x\n",
+             __FUNCTION__, rdev_p->dev_name, rdev_p->rnic_info.tpt_base,
+             rdev_p->rnic_info.tpt_top, cxio_num_stags(rdev_p),
+             rdev_p->rnic_info.pbl_base,
+             rdev_p->rnic_info.pbl_top, rdev_p->rnic_info.rqt_base,
+             rdev_p->rnic_info.rqt_top);
+        PDBG("udbell_len 0x%0x udbell_physbase 0x%lx kdb_addr %p qpshift %lu "
+             "qpnr %d qpmask 0x%x\n",
+             rdev_p->rnic_info.udbell_len,
+             rdev_p->rnic_info.udbell_physbase, rdev_p->rnic_info.kdb_addr,
+             rdev_p->qpshift, rdev_p->qpnr, rdev_p->qpmask);
+
+        err = cxio_hal_init_ctrl_qp(rdev_p);
+        if (err) {
+                printk(KERN_ERR "%s error %d initializing ctrl_qp.\n",
+                       __FUNCTION__, err);
+                goto err1;
+        }
+        err = cxio_hal_init_resource(rdev_p, cxio_num_stags(rdev_p), 0,
+                                     0, T3_MAX_NUM_QP, T3_MAX_NUM_CQ,
+                                     T3_MAX_NUM_PD);
+        if (err) {
+                printk(KERN_ERR "%s error %d initializing hal resources.\n",
+                       __FUNCTION__, err);
+                goto err2;
+        }
+        err = cxio_hal_pblpool_create(rdev_p);
+        if (err) {
+                printk(KERN_ERR "%s error %d initializing pbl mem pool.\n",
+                       __FUNCTION__, err);
+                goto err3;
+        }
+        err = cxio_hal_rqtpool_create(rdev_p);
+        if (err) {
+                printk(KERN_ERR "%s error %d initializing rqt mem pool.\n",
+                       __FUNCTION__, err);
+                goto err4;
+        }
+        return 0;
+err4:
+        cxio_hal_pblpool_destroy(rdev_p);
+err3:
+        cxio_hal_destroy_resource(rdev_p->rscp);
+err2:
+        cxio_hal_destroy_ctrl_qp(rdev_p);
+err1:
+        list_del(&rdev_p->entry);
+        return err;
+}
+
+void cxio_rdev_close(struct cxio_rdev *rdev_p)
+{
+        if (rdev_p) {
+                cxio_hal_pblpool_destroy(rdev_p);
+                cxio_hal_rqtpool_destroy(rdev_p);
+                list_del(&rdev_p->entry);
+                rdev_p->t3cdev_p->ulp = NULL;
+                cxio_hal_destroy_ctrl_qp(rdev_p);
+                cxio_hal_destroy_resource(rdev_p->rscp);
+        }
+}
+
+int __init cxio_hal_init(void)
+{
+        if (cxio_hal_init_rhdl_resource(T3_MAX_NUM_RI))
+                return -ENOMEM;
+        t3_register_cpl_handler(CPL_ASYNC_NOTIF, cxio_hal_ev_handler);
+        return 0;
+}
+
+void __exit cxio_hal_exit(void)
+{
+        struct cxio_rdev *rdev, *tmp;
+
+        t3_register_cpl_handler(CPL_ASYNC_NOTIF, NULL);
+        list_for_each_entry_safe(rdev, tmp, &rdev_list, entry)
+                cxio_rdev_close(rdev);
+        cxio_hal_destroy_rhdl_resource();
+}
+
+static inline void flush_completed_wrs(struct t3_wq *wq, struct t3_cq *cq)
+{
+        struct t3_swsq *sqp;
+        __u32 ptr = wq->sq_rptr;
+        int count = Q_COUNT(wq->sq_rptr, wq->sq_wptr);
+
+        sqp = wq->sq + Q_PTR2IDX(ptr, wq->sq_size_log2);
+        while (count--)
+                if (!sqp->signaled) {
+                        ptr++;
+                        sqp = wq->sq + Q_PTR2IDX(ptr,  wq->sq_size_log2);
+                } else if (sqp->complete) {
+
+                        /*
+                         * Insert this completed cqe into the swcq.
+                         */
+                        PDBG("%s moving cqe into swcq sq idx %ld cq idx %ld\n",
+                             __FUNCTION__, Q_PTR2IDX(ptr,  wq->sq_size_log2),
+                             Q_PTR2IDX(cq->sw_wptr, cq->size_log2));
+                        sqp->cqe.header |= htonl(V_CQE_SWCQE(1));
+                        *(cq->sw_queue + Q_PTR2IDX(cq->sw_wptr, cq->size_log2))
+                                = sqp->cqe;
+                        cq->sw_wptr++;
+                        sqp->signaled = 0;
+                        break;
+                } else
+                        break;
+}
+
+static inline void create_read_req_cqe(struct t3_wq *wq,
+                                       struct t3_cqe *hw_cqe,
+                                       struct t3_cqe *read_cqe)
+{
+        read_cqe->u.scqe.wrid_hi = wq->oldest_read->sq_wptr;
+        read_cqe->len = wq->oldest_read->read_len;
+        read_cqe->header = htonl(V_CQE_QPID(CQE_QPID(*hw_cqe)) |
+                                 V_CQE_SWCQE(SW_CQE(*hw_cqe)) |
+                                 V_CQE_OPCODE(T3_READ_REQ) |
+                                 V_CQE_TYPE(1));
+}
+
+/*
+ * Return a ptr to the next read wr in the SWSQ or NULL.
+ */
+static inline void advance_oldest_read(struct t3_wq *wq)
+{
+
+        u32 rptr = wq->oldest_read - wq->sq + 1;
+        u32 wptr = Q_PTR2IDX(wq->sq_wptr, wq->sq_size_log2);
+
+        while (Q_PTR2IDX(rptr, wq->sq_size_log2) != wptr) {
+                wq->oldest_read = wq->sq + Q_PTR2IDX(rptr, wq->sq_size_log2);
+
+                if (wq->oldest_read->opcode == T3_READ_REQ)
+                        return;
+                rptr++;
+        }
+        wq->oldest_read = NULL;
+}
+
+/*
+ * cxio_poll_cq
+ *
+ * Caller must:
+ *     check the validity of the first CQE,
+ *     supply the wq assicated with the qpid.
+ *
+ * credit: cq credit to return to sge.
+ * cqe_flushed: 1 iff the CQE is flushed.
+ * cqe: copy of the polled CQE.
+ *
+ * return value:
+ *     0       CQE returned,
+ *    -1       CQE skipped, try again.
+ */
+int cxio_poll_cq(struct t3_wq *wq, struct t3_cq *cq, struct t3_cqe *cqe,
+                     u8 *cqe_flushed, u64 *cookie, u32 *credit)
+{
+        int ret = 0;
+        struct t3_cqe *hw_cqe, read_cqe;
+
+        *cqe_flushed = 0;
+        *credit = 0;
+        hw_cqe = cxio_next_cqe(cq);
+
+        PDBG("%s CQE OOO %d qpid 0x%0x genbit %d type %d status 0x%0x"
+             " opcode 0x%0x len 0x%0x wrid_hi_stag 0x%x wrid_low_msn 0x%x\n",
+             __FUNCTION__, CQE_OOO(*hw_cqe), CQE_QPID(*hw_cqe),
+             CQE_GENBIT(*hw_cqe), CQE_TYPE(*hw_cqe), CQE_STATUS(*hw_cqe),
+             CQE_OPCODE(*hw_cqe), CQE_LEN(*hw_cqe), CQE_WRID_HI(*hw_cqe),
+             CQE_WRID_LOW(*hw_cqe));
+
+        /*
+         * skip cqe's not affiliated with a QP.
+         */
+        if (wq == NULL) {
+                ret = -1;
+                goto skip_cqe;
+        }
+
+        /*
+         * Gotta tweak READ completions:
+         *      1) the cqe doesn't contain the sq_wptr from the wr.
+         *      2) opcode not reflected from the wr.
+         *      3) read_len not reflected from the wr.
+         *      4) cq_type is RQ_TYPE not SQ_TYPE.
+         */
+        if (RQ_TYPE(*hw_cqe) && (CQE_OPCODE(*hw_cqe) == T3_READ_RESP)) {
+
+                /*
+                 * Don't write to the HWCQ, so create a new read req CQE
+                 * in local memory.
+                 */
+                create_read_req_cqe(wq, hw_cqe, &read_cqe);
+                hw_cqe = &read_cqe;
+                advance_oldest_read(wq);
+        }
+
+        /*
+         * T3A: Discard TERMINATE CQEs.
+         */
+        if (CQE_OPCODE(*hw_cqe) == T3_TERMINATE) {
+                ret = -1;
+                wq->error = 1;
+                goto skip_cqe;
+        }
+
+        if (CQE_STATUS(*hw_cqe) || wq->error) {
+                *cqe_flushed = wq->error;
+                wq->error = 1;
+
+                /*
+                 * T3A inserts errors into the CQE.  We cannot return
+                 * these as work completions.
+                 */
+                /* incoming write failures */
+                if ((CQE_OPCODE(*hw_cqe) == T3_RDMA_WRITE)
+                     && RQ_TYPE(*hw_cqe)) {
+                        ret = -1;
+                        goto skip_cqe;
+                }
+                /* incoming read request failures */
+                if ((CQE_OPCODE(*hw_cqe) == T3_READ_RESP) && SQ_TYPE(*hw_cqe)) {
+                        ret = -1;
+                        goto skip_cqe;
+                }
+
+                /* incoming SEND with no receive posted failures */
+                if ((CQE_OPCODE(*hw_cqe) == T3_SEND) && RQ_TYPE(*hw_cqe) &&
+                    Q_EMPTY(wq->rq_rptr, wq->rq_wptr)) {
+                        ret = -1;
+                        goto skip_cqe;
+                }
+                goto proc_cqe;
+        }
+
+        /*
+         * RECV completion.
+         */
+        if (RQ_TYPE(*hw_cqe)) {
+
+                /*
+                 * HW only validates 4 bits of MSN.  So we must validate that
+                 * the MSN in the SEND is the next expected MSN.  If its not,
+                 * then we complete this with TPT_ERR_MSN and mark the wq in
+                 * error.
+                 */
+                if (unlikely((CQE_WRID_MSN(*hw_cqe) != (wq->rq_rptr + 1)))) {
+                        wq->error = 1;
+                        hw_cqe->header |= htonl(V_CQE_STATUS(TPT_ERR_MSN));
+                        goto proc_cqe;
+                }
+                goto proc_cqe;
+        }
+
+        /*
+         * If we get here its a send completion.
+         *
+         * Handle out of order completion. These get stuffed
+         * in the SW SQ. Then the SW SQ is walked to move any
+         * now in-order completions into the SW CQ.  This handles
+         * 2 cases:
+         *      1) reaping unsignaled WRs when the first subsequent
+         *         signaled WR is completed.
+         *      2) out of order read completions.
+         */
+        if (!SW_CQE(*hw_cqe) && (CQE_WRID_SQ_WPTR(*hw_cqe) != wq->sq_rptr)) {
+                struct t3_swsq *sqp;
+
+                PDBG("%s out of order completion going in swsq at idx %ld\n",
+                     __FUNCTION__,
+                     Q_PTR2IDX(CQE_WRID_SQ_WPTR(*hw_cqe), wq->sq_size_log2));
+                sqp = wq->sq +
+                      Q_PTR2IDX(CQE_WRID_SQ_WPTR(*hw_cqe), wq->sq_size_log2);
+                sqp->cqe = *hw_cqe;
+                sqp->complete = 1;
+                ret = -1;
+                goto flush_wq;
+        }
+
+proc_cqe:
+        *cqe = *hw_cqe;
+
+        /*
+         * Reap the associated WR(s) that are freed up with this
+         * completion.
+         */
+        if (SQ_TYPE(*hw_cqe)) {
+                wq->sq_rptr = CQE_WRID_SQ_WPTR(*hw_cqe);
+                PDBG("%s completing sq idx %ld\n", __FUNCTION__,
+                     Q_PTR2IDX(wq->sq_rptr, wq->sq_size_log2));
+                *cookie = (wq->sq +
+                           Q_PTR2IDX(wq->sq_rptr, wq->sq_size_log2))->wr_id;
+                wq->sq_rptr++;
+        } else {
+                PDBG("%s completing rq idx %ld\n", __FUNCTION__,
+                     Q_PTR2IDX(wq->rq_rptr, wq->rq_size_log2));
+                *cookie = *(wq->rq + Q_PTR2IDX(wq->rq_rptr, wq->rq_size_log2));
+                wq->rq_rptr++;
+        }
+
+flush_wq:
+        /*
+         * Flush any completed cqes that are now in-order.
+         */
+        flush_completed_wrs(wq, cq);
+
+skip_cqe:
+        if (SW_CQE(*hw_cqe)) {
+                PDBG("%s cq %p cqid 0x%x skip sw cqe sw_rptr 0x%x\n",
+                     __FUNCTION__, cq, cq->cqid, cq->sw_rptr);
+                ++cq->sw_rptr;
+        } else {
+                PDBG("%s cq %p cqid 0x%x skip hw cqe rptr 0x%x\n",
+                     __FUNCTION__, cq, cq->cqid, cq->rptr);
+                ++cq->rptr;
+
+                /*
+                 * T3A: compute credits.
+                 */
+                if (((cq->rptr - cq->wptr) > (1 << (cq->size_log2 - 1)))
+                    || ((cq->rptr - cq->wptr) >= 128)) {
+                        *credit = cq->rptr - cq->wptr;
+                        cq->wptr = cq->rptr;
+                }
+        }
+        return ret;
+}