IB/qib: Add new qib driver for QLogic PCIe InfiniBand adapters

Add a low-level IB driver for QLogic PCIe adapters.

Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 375 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/qib/qib_srq.c b/drivers/infiniband/hw/qib/qib_srq.c
new file mode 100644
index 000000000000..c3ec8efc2ed8
--- /dev/null
+++ b/drivers/infiniband/hw/qib/qib_srq.c
@@ -0,0 +1,375 @@
+/*
+ * 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/slab.h>
+#include <linux/vmalloc.h>
+
+#include "qib_verbs.h"
+
+/**
+ * qib_post_srq_receive - post a receive on a shared receive queue
+ * @ibsrq: the SRQ to post the receive on
+ * @wr: the list of work requests to post
+ * @bad_wr: A pointer to the first WR to cause a problem is put here
+ *
+ * This may be called from interrupt context.
+ */
+int qib_post_srq_receive(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
+                         struct ib_recv_wr **bad_wr)
+{
+        struct qib_srq *srq = to_isrq(ibsrq);
+        struct qib_rwq *wq;
+        unsigned long flags;
+        int ret;
+
+        for (; wr; wr = wr->next) {
+                struct qib_rwqe *wqe;
+                u32 next;
+                int i;
+
+                if ((unsigned) wr->num_sge > srq->rq.max_sge) {
+                        *bad_wr = wr;
+                        ret = -EINVAL;
+                        goto bail;
+                }
+
+                spin_lock_irqsave(&srq->rq.lock, flags);
+                wq = srq->rq.wq;
+                next = wq->head + 1;
+                if (next >= srq->rq.size)
+                        next = 0;
+                if (next == wq->tail) {
+                        spin_unlock_irqrestore(&srq->rq.lock, flags);
+                        *bad_wr = wr;
+                        ret = -ENOMEM;
+                        goto bail;
+                }
+
+                wqe = get_rwqe_ptr(&srq->rq, wq->head);
+                wqe->wr_id = wr->wr_id;
+                wqe->num_sge = wr->num_sge;
+                for (i = 0; i < wr->num_sge; i++)
+                        wqe->sg_list[i] = wr->sg_list[i];
+                /* Make sure queue entry is written before the head index. */
+                smp_wmb();
+                wq->head = next;
+                spin_unlock_irqrestore(&srq->rq.lock, flags);
+        }
+        ret = 0;
+
+bail:
+        return ret;
+}
+
+/**
+ * qib_create_srq - create a shared receive queue
+ * @ibpd: the protection domain of the SRQ to create
+ * @srq_init_attr: the attributes of the SRQ
+ * @udata: data from libibverbs when creating a user SRQ
+ */
+struct ib_srq *qib_create_srq(struct ib_pd *ibpd,
+                              struct ib_srq_init_attr *srq_init_attr,
+                              struct ib_udata *udata)
+{
+        struct qib_ibdev *dev = to_idev(ibpd->device);
+        struct qib_srq *srq;
+        u32 sz;
+        struct ib_srq *ret;
+
+        if (srq_init_attr->attr.max_sge == 0 ||
+            srq_init_attr->attr.max_sge > ib_qib_max_srq_sges ||
+            srq_init_attr->attr.max_wr == 0 ||
+            srq_init_attr->attr.max_wr > ib_qib_max_srq_wrs) {
+                ret = ERR_PTR(-EINVAL);
+                goto done;
+        }
+
+        srq = kmalloc(sizeof(*srq), GFP_KERNEL);
+        if (!srq) {
+                ret = ERR_PTR(-ENOMEM);
+                goto done;
+        }
+
+        /*
+         * Need to use vmalloc() if we want to support large #s of entries.
+         */
+        srq->rq.size = srq_init_attr->attr.max_wr + 1;
+        srq->rq.max_sge = srq_init_attr->attr.max_sge;
+        sz = sizeof(struct ib_sge) * srq->rq.max_sge +
+                sizeof(struct qib_rwqe);
+        srq->rq.wq = vmalloc_user(sizeof(struct qib_rwq) + srq->rq.size * sz);
+        if (!srq->rq.wq) {
+                ret = ERR_PTR(-ENOMEM);
+                goto bail_srq;
+        }
+
+        /*
+         * Return the address of the RWQ as the offset to mmap.
+         * See qib_mmap() for details.
+         */
+        if (udata && udata->outlen >= sizeof(__u64)) {
+                int err;
+                u32 s = sizeof(struct qib_rwq) + srq->rq.size * sz;
+
+                srq->ip =
+                    qib_create_mmap_info(dev, s, ibpd->uobject->context,
+                                         srq->rq.wq);
+                if (!srq->ip) {
+                        ret = ERR_PTR(-ENOMEM);
+                        goto bail_wq;
+                }
+
+                err = ib_copy_to_udata(udata, &srq->ip->offset,
+                                       sizeof(srq->ip->offset));
+                if (err) {
+                        ret = ERR_PTR(err);
+                        goto bail_ip;
+                }
+        } else
+                srq->ip = NULL;
+
+        /*
+         * ib_create_srq() will initialize srq->ibsrq.
+         */
+        spin_lock_init(&srq->rq.lock);
+        srq->rq.wq->head = 0;
+        srq->rq.wq->tail = 0;
+        srq->limit = srq_init_attr->attr.srq_limit;
+
+        spin_lock(&dev->n_srqs_lock);
+        if (dev->n_srqs_allocated == ib_qib_max_srqs) {
+                spin_unlock(&dev->n_srqs_lock);
+                ret = ERR_PTR(-ENOMEM);
+                goto bail_ip;
+        }
+
+        dev->n_srqs_allocated++;
+        spin_unlock(&dev->n_srqs_lock);
+
+        if (srq->ip) {
+                spin_lock_irq(&dev->pending_lock);
+                list_add(&srq->ip->pending_mmaps, &dev->pending_mmaps);
+                spin_unlock_irq(&dev->pending_lock);
+        }
+
+        ret = &srq->ibsrq;
+        goto done;
+
+bail_ip:
+        kfree(srq->ip);
+bail_wq:
+        vfree(srq->rq.wq);
+bail_srq:
+        kfree(srq);
+done:
+        return ret;
+}
+
+/**
+ * qib_modify_srq - modify a shared receive queue
+ * @ibsrq: the SRQ to modify
+ * @attr: the new attributes of the SRQ
+ * @attr_mask: indicates which attributes to modify
+ * @udata: user data for libibverbs.so
+ */
+int qib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
+                   enum ib_srq_attr_mask attr_mask,
+                   struct ib_udata *udata)
+{
+        struct qib_srq *srq = to_isrq(ibsrq);
+        struct qib_rwq *wq;
+        int ret = 0;
+
+        if (attr_mask & IB_SRQ_MAX_WR) {
+                struct qib_rwq *owq;
+                struct qib_rwqe *p;
+                u32 sz, size, n, head, tail;
+
+                /* Check that the requested sizes are below the limits. */
+                if ((attr->max_wr > ib_qib_max_srq_wrs) ||
+                    ((attr_mask & IB_SRQ_LIMIT) ?
+                     attr->srq_limit : srq->limit) > attr->max_wr) {
+                        ret = -EINVAL;
+                        goto bail;
+                }
+
+                sz = sizeof(struct qib_rwqe) +
+                        srq->rq.max_sge * sizeof(struct ib_sge);
+                size = attr->max_wr + 1;
+                wq = vmalloc_user(sizeof(struct qib_rwq) + size * sz);
+                if (!wq) {
+                        ret = -ENOMEM;
+                        goto bail;
+                }
+
+                /* Check that we can write the offset to mmap. */
+                if (udata && udata->inlen >= sizeof(__u64)) {
+                        __u64 offset_addr;
+                        __u64 offset = 0;
+
+                        ret = ib_copy_from_udata(&offset_addr, udata,
+                                                 sizeof(offset_addr));
+                        if (ret)
+                                goto bail_free;
+                        udata->outbuf =
+                                (void __user *) (unsigned long) offset_addr;
+                        ret = ib_copy_to_udata(udata, &offset,
+                                               sizeof(offset));
+                        if (ret)
+                                goto bail_free;
+                }
+
+                spin_lock_irq(&srq->rq.lock);
+                /*
+                 * validate head and tail pointer values and compute
+                 * the number of remaining WQEs.
+                 */
+                owq = srq->rq.wq;
+                head = owq->head;
+                tail = owq->tail;
+                if (head >= srq->rq.size || tail >= srq->rq.size) {
+                        ret = -EINVAL;
+                        goto bail_unlock;
+                }
+                n = head;
+                if (n < tail)
+                        n += srq->rq.size - tail;
+                else
+                        n -= tail;
+                if (size <= n) {
+                        ret = -EINVAL;
+                        goto bail_unlock;
+                }
+                n = 0;
+                p = wq->wq;
+                while (tail != head) {
+                        struct qib_rwqe *wqe;
+                        int i;
+
+                        wqe = get_rwqe_ptr(&srq->rq, tail);
+                        p->wr_id = wqe->wr_id;
+                        p->num_sge = wqe->num_sge;
+                        for (i = 0; i < wqe->num_sge; i++)
+                                p->sg_list[i] = wqe->sg_list[i];
+                        n++;
+                        p = (struct qib_rwqe *)((char *) p + sz);
+                        if (++tail >= srq->rq.size)
+                                tail = 0;
+                }
+                srq->rq.wq = wq;
+                srq->rq.size = size;
+                wq->head = n;
+                wq->tail = 0;
+                if (attr_mask & IB_SRQ_LIMIT)
+                        srq->limit = attr->srq_limit;
+                spin_unlock_irq(&srq->rq.lock);
+
+                vfree(owq);
+
+                if (srq->ip) {
+                        struct qib_mmap_info *ip = srq->ip;
+                        struct qib_ibdev *dev = to_idev(srq->ibsrq.device);
+                        u32 s = sizeof(struct qib_rwq) + size * sz;
+
+                        qib_update_mmap_info(dev, ip, s, wq);
+
+                        /*
+                         * Return the offset to mmap.
+                         * See qib_mmap() for details.
+                         */
+                        if (udata && udata->inlen >= sizeof(__u64)) {
+                                ret = ib_copy_to_udata(udata, &ip->offset,
+                                                       sizeof(ip->offset));
+                                if (ret)
+                                        goto bail;
+                        }
+
+                        /*
+                         * Put user mapping info onto the pending list
+                         * unless it already is on the list.
+                         */
+                        spin_lock_irq(&dev->pending_lock);
+                        if (list_empty(&ip->pending_mmaps))
+                                list_add(&ip->pending_mmaps,
+                                         &dev->pending_mmaps);
+                        spin_unlock_irq(&dev->pending_lock);
+                }
+        } else if (attr_mask & IB_SRQ_LIMIT) {
+                spin_lock_irq(&srq->rq.lock);
+                if (attr->srq_limit >= srq->rq.size)
+                        ret = -EINVAL;
+                else
+                        srq->limit = attr->srq_limit;
+                spin_unlock_irq(&srq->rq.lock);
+        }
+        goto bail;
+
+bail_unlock:
+        spin_unlock_irq(&srq->rq.lock);
+bail_free:
+        vfree(wq);
+bail:
+        return ret;
+}
+
+int qib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr)
+{
+        struct qib_srq *srq = to_isrq(ibsrq);
+
+        attr->max_wr = srq->rq.size - 1;
+        attr->max_sge = srq->rq.max_sge;
+        attr->srq_limit = srq->limit;
+        return 0;
+}
+
+/**
+ * qib_destroy_srq - destroy a shared receive queue
+ * @ibsrq: the SRQ to destroy
+ */
+int qib_destroy_srq(struct ib_srq *ibsrq)
+{
+        struct qib_srq *srq = to_isrq(ibsrq);
+        struct qib_ibdev *dev = to_idev(ibsrq->device);
+
+        spin_lock(&dev->n_srqs_lock);
+        dev->n_srqs_allocated--;
+        spin_unlock(&dev->n_srqs_lock);
+        if (srq->ip)
+                kref_put(&srq->ip->ref, qib_release_mmap_info);
+        else
+                vfree(srq->rq.wq);
+        kfree(srq);
+
+        return 0;
+}