Date:	Tue,  5 Oct 2010 08:54:25 +0200
From:	Bernard Metzler <bmt@...ich.ibm.com>
To:	netdev@...r.kernel.org
Cc:	linux-rdma@...r.kernel.org, Bernard Metzler <bmt@...ich.ibm.com>
Subject: [PATCH] SIW: Object management

---
 drivers/infiniband/hw/siw/siw_obj.c |  499 +++++++++++++++++++++++++++++++++++
 drivers/infiniband/hw/siw/siw_obj.h |  109 ++++++++
 2 files changed, 608 insertions(+), 0 deletions(-)
 create mode 100644 drivers/infiniband/hw/siw/siw_obj.c
 create mode 100644 drivers/infiniband/hw/siw/siw_obj.h

diff --git a/drivers/infiniband/hw/siw/siw_obj.c b/drivers/infiniband/hw/siw/siw_obj.c
new file mode 100644
index 0000000..b5a1a3d
--- /dev/null
+++ b/drivers/infiniband/hw/siw/siw_obj.c
@@ -0,0 +1,499 @@
+/*
+ * Software iWARP device driver for Linux
+ *
+ * Authors: Bernard Metzler <bmt@...ich.ibm.com>
+ *
+ * Copyright (c) 2008-2010, IBM Corporation
+ *
+ * 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
+ * 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.
+ *
+ *   - Neither the name of IBM nor the names of its contributors may be
+ *     used to endorse or promote products derived from this software without
+ *     specific prior written permission.
+ *
+ * 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/spinlock.h>
+#include <linux/kref.h>
+
+#include "siw.h"
+#include "siw_obj.h"
+#include "siw_cm.h"
+
+
+void siw_objhdr_init(struct siw_objhdr *hdr)
+{
+	kref_init(&hdr->ref);
+}
+
+void siw_idr_init(struct siw_dev *dev)
+{
+	spin_lock_init(&dev->idr_lock);
+
+	idr_init(&dev->qp_idr);
+	idr_init(&dev->cq_idr);
+	idr_init(&dev->pd_idr);
+	idr_init(&dev->mem_idr);
+}
+
+void siw_idr_release(struct siw_dev *dev)
+{
+	idr_destroy(&dev->qp_idr);
+	idr_destroy(&dev->cq_idr);
+	idr_destroy(&dev->pd_idr);
+	idr_destroy(&dev->mem_idr);
+}
+
+static inline int siw_add_obj(spinlock_t *lock, struct idr *idr,
+			      struct siw_objhdr *obj)
+{
+	u32		pre_id, id;
+	unsigned long	flags;
+	int		rv;
+
+	get_random_bytes(&pre_id, sizeof pre_id);
+	pre_id &= 0xffff;
+again:
+	do {
+		if (!(idr_pre_get(idr, GFP_KERNEL)))
+			return -ENOMEM;
+
+		spin_lock_irqsave(lock, flags);
+		rv = idr_get_new_above(idr, obj, pre_id, &id);
+		spin_unlock_irqrestore(lock, flags);
+
+	} while  (rv == -EAGAIN);
+
+	if (rv == 0) {
+		siw_objhdr_init(obj);
+		obj->id = id;
+		dprint(DBG_OBJ, "(OBJ%d): IDR New Object\n", id);
+	} else if (rv == -ENOSPC && pre_id != 1) {
+		pre_id = 1;
+		goto again;
+	} else {
+		dprint(DBG_OBJ|DBG_ON, "(OBJ??): IDR New Object failed!\n");
+	}
+	return rv;
+}
+
+static inline struct siw_objhdr *siw_get_obj(struct idr *idr, int id)
+{
+	struct siw_objhdr *obj;
+
+	obj = idr_find(idr, id);
+	if (obj)
+		kref_get(&obj->ref);
+
+	return obj;
+}
+
+struct siw_cq *siw_cq_id2obj(struct siw_dev *dev, int id)
+{
+	struct siw_objhdr *obj = siw_get_obj(&dev->cq_idr, id);
+	if (obj)
+		return container_of(obj, struct siw_cq, hdr);
+
+	return NULL;
+}
+
+struct siw_qp *siw_qp_id2obj(struct siw_dev *dev, int id)
+{
+	struct siw_objhdr *obj = siw_get_obj(&dev->qp_idr, id);
+	if (obj)
+		return container_of(obj, struct siw_qp, hdr);
+
+	return NULL;
+}
+
+/*
+ * siw_mem_id2obj()
+ *
+ * resolves memory from stag given by id. might be called from:
+ * o process context before sending out of sgl
+ * o or in softirq when resolving target memory
+ */
+struct siw_mem *siw_mem_id2obj(struct siw_dev *dev, int id)
+{
+	struct siw_objhdr *obj;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->idr_lock, flags);
+	obj = siw_get_obj(&dev->mem_idr, id);
+	spin_unlock_irqrestore(&dev->idr_lock, flags);
+
+	if (obj) {
+		dprint(DBG_MM|DBG_OBJ, "(MEM%d): New refcount: %d\n",
+		       obj->id, obj->ref.refcount.counter);
+
+		return container_of(obj, struct siw_mem, hdr);
+	}
+	dprint(DBG_MM|DBG_OBJ|DBG_ON, "(MEM%d): not found!\n", id);
+
+	return NULL;
+}
+
+int siw_qp_add(struct siw_dev *dev, struct siw_qp *qp)
+{
+	int rv = siw_add_obj(&dev->idr_lock, &dev->qp_idr, &qp->hdr);
+	if (!rv) {
+		dprint(DBG_OBJ, "(QP%d): New Object\n", QP_ID(qp));
+		qp->hdr.dev = dev;
+	}
+	return rv;
+}
+
+int siw_cq_add(struct siw_dev *dev, struct siw_cq *cq)
+{
+	int rv = siw_add_obj(&dev->idr_lock, &dev->cq_idr, &cq->hdr);
+	if (!rv) {
+		dprint(DBG_OBJ, "(CQ%d): New Object\n", cq->hdr.id);
+		cq->hdr.dev = dev;
+	}
+	return rv;
+}
+
+int siw_pd_add(struct siw_dev *dev, struct siw_pd *pd)
+{
+	int rv = siw_add_obj(&dev->idr_lock, &dev->pd_idr, &pd->hdr);
+	if (!rv) {
+		dprint(DBG_OBJ, "(PD%d): New Object\n", pd->hdr.id);
+		pd->hdr.dev = dev;
+	}
+	return rv;
+}
+
+/*
+ * Stag lookup is based on its index part only (24 bits)
+ * It is assumed that the idr_get_new_above(,,1,) function will
+ * always return a new id within this range (0x1...0xffffff),
+ * if one is available.
+ * The code avoids special Stag of zero and tries to randomize
+ * STag values.
+ */
+int siw_mem_add(struct siw_dev *dev, struct siw_mem *m)
+{
+	u32		id, pre_id;
+	unsigned long	flags;
+	int		rv;
+
+	do {
+		get_random_bytes(&pre_id, sizeof pre_id);
+		pre_id &= 0xffff;
+	} while (pre_id == 0);
+again:
+	do {
+		if (!(idr_pre_get(&dev->mem_idr, GFP_KERNEL)))
+			return -ENOMEM;
+
+		spin_lock_irqsave(&dev->idr_lock, flags);
+		rv = idr_get_new_above(&dev->mem_idr, m, pre_id, &id);
+		spin_unlock_irqrestore(&dev->idr_lock, flags);
+
+	} while (rv == -EAGAIN);
+
+	if (rv == -ENOSPC || (rv == 0 && id > SIW_STAG_MAX)) {
+		if (rv == 0) {
+			spin_lock_irqsave(&dev->idr_lock, flags);
+			idr_remove(&dev->mem_idr, id);
+			spin_unlock_irqrestore(&dev->idr_lock, flags);
+		}
+		if (pre_id == 1) {
+			dprint(DBG_OBJ|DBG_MM|DBG_ON,
+				"(IDR): New Object failed: %d\n", pre_id);
+			return -ENOSPC;
+		}
+		pre_id = 1;
+		goto again;
+	} else if (rv) {
+		dprint(DBG_OBJ|DBG_MM|DBG_ON,
+			"(IDR%d): New Object failed: rv %d\n", id, rv);
+		return rv;
+	}
+	siw_objhdr_init(&m->hdr);
+	m->hdr.id = id;
+	m->hdr.dev = dev;
+	dprint(DBG_OBJ|DBG_MM, "(IDR%d): New Object\n", id);
+
+	return 0;
+}
+
+void siw_remove_obj(spinlock_t *lock, struct idr *idr,
+		      struct siw_objhdr *hdr)
+{
+	unsigned long	flags;
+
+	dprint(DBG_OBJ, "(OBJ%d): IDR Remove Object\n", hdr->id);
+
+	spin_lock_irqsave(lock, flags);
+	idr_remove(idr, hdr->id);
+	spin_unlock_irqrestore(lock, flags);
+}
+
+
+/********** routines to put objs back and free if no ref left *****/
+
+static void siw_free_cq(struct kref *ref)
+{
+	struct siw_cq *cq =
+		(container_of(container_of(ref, struct siw_objhdr, ref),
+			      struct siw_cq, hdr));
+
+	dprint(DBG_OBJ, "(CQ%d): Free Object\n", cq->hdr.id);
+
+	kfree(cq);
+}
+
+static void siw_free_qp(struct kref *ref)
+{
+	struct siw_qp	*qp =
+		container_of(container_of(ref, struct siw_objhdr, ref),
+			     struct siw_qp, hdr);
+
+	dprint(DBG_OBJ|DBG_CM, "(QP%d): Free Object\n", QP_ID(qp));
+
+	if (qp->cep)
+		siw_cep_put(qp->cep);
+
+	kfree(qp);
+}
+
+static void siw_free_pd(struct kref *ref)
+{
+	struct siw_pd	*pd =
+		container_of(container_of(ref, struct siw_objhdr, ref),
+			     struct siw_pd, hdr);
+
+	dprint(DBG_OBJ, "(PD%d): Free Object\n", pd->hdr.id);
+
+	kfree(pd);
+}
+
+static void siw_free_mem(struct kref *ref)
+{
+	struct siw_mem *m;
+
+	m = container_of(container_of(ref, struct siw_objhdr, ref),
+			 struct siw_mem, hdr);
+
+	dprint(DBG_MM|DBG_OBJ, "(MEM%d): Free Object\n", OBJ_ID(m));
+
+	if (SIW_MEM_IS_MW(m)) {
+		struct siw_mw *mw = container_of(m, struct siw_mw, mem);
+		kfree(mw);
+	} else {
+		struct siw_mr *mr = container_of(m, struct siw_mr, mem);
+		dprint(DBG_MM|DBG_OBJ, "(MEM%d): Release UMem\n", OBJ_ID(m));
+		ib_umem_release(mr->umem);
+		kfree(mr);
+	}
+}
+
+
+void siw_cq_put(struct siw_cq *cq)
+{
+	dprint(DBG_OBJ, "(CQ%d): Old refcount: %d\n",
+		OBJ_ID(cq), atomic_read(&cq->hdr.ref.refcount));
+	kref_put(&cq->hdr.ref, siw_free_cq);
+}
+
+void siw_qp_put(struct siw_qp *qp)
+{
+	dprint(DBG_OBJ, "(QP%d): Old refcount: %d\n",
+		QP_ID(qp), atomic_read(&qp->hdr.ref.refcount));
+	kref_put(&qp->hdr.ref, siw_free_qp);
+}
+
+void siw_pd_put(struct siw_pd *pd)
+{
+	dprint(DBG_OBJ, "(PD%d): Old refcount: %d\n",
+		OBJ_ID(pd), atomic_read(&pd->hdr.ref.refcount));
+	kref_put(&pd->hdr.ref, siw_free_pd);
+}
+
+void siw_mem_put(struct siw_mem *m)
+{
+	dprint(DBG_MM|DBG_OBJ, "(MEM%d): Old refcount: %d\n",
+		OBJ_ID(m), atomic_read(&m->hdr.ref.refcount));
+	kref_put(&m->hdr.ref, siw_free_mem);
+}
+
+
+/***** routines for WQE handling ***/
+
+/*
+ * siw_wqe_get()
+ *
+ * Get new WQE. For READ RESPONSE, take it from the free list which
+ * has a maximum size of maximum inbound READs. All other WQE are
+ * malloc'ed which creates some overhead. Consider change to
+ *
+ * 1. malloc WR only if it cannot be synchonously completed, or
+ * 2. operate own cache of reuseable WQE's.
+ *
+ * Current code trusts on malloc efficiency.
+ */
+inline struct siw_wqe *siw_wqe_get(struct siw_qp *qp, enum siw_wr_opcode op)
+{
+	struct siw_wqe *wqe;
+
+	if (op == SIW_WR_RDMA_READ_RESP) {
+		spin_lock(&qp->freelist_lock);
+		if (!(list_empty(&qp->wqe_freelist))) {
+			wqe = list_entry(qp->wqe_freelist.next,
+					 struct siw_wqe, list);
+			list_del(&wqe->list);
+			spin_unlock(&qp->freelist_lock);
+			wqe->processed = 0;
+			dprint(DBG_OBJ|DBG_WR,
+				"(QP%d): WQE from FreeList p: %p\n",
+				QP_ID(qp), wqe);
+		} else {
+			spin_unlock(&qp->freelist_lock);
+			wqe = NULL;
+			dprint(DBG_ON|DBG_OBJ|DBG_WR,
+				"(QP%d): FreeList empty!\n", QP_ID(qp));
+		}
+	} else {
+		wqe = kzalloc(sizeof(struct siw_wqe), GFP_KERNEL);
+		dprint(DBG_OBJ|DBG_WR, "(QP%d): New WQE p: %p\n",
+			QP_ID(qp), wqe);
+	}
+	if (wqe) {
+		INIT_LIST_HEAD(&wqe->list);
+		siw_qp_get(qp);
+		wqe->qp = qp;
+	}
+	return wqe;
+}
+
+inline struct siw_wqe *siw_srq_wqe_get(struct siw_srq *srq)
+{
+	struct siw_wqe *wqe = kzalloc(sizeof(struct siw_wqe), GFP_KERNEL);
+
+	dprint(DBG_OBJ|DBG_WR, "(SRQ%p): New WQE p: %p\n", srq, wqe);
+	if (wqe) {
+		/* implicite: wqe->qp = NULL; */
+		INIT_LIST_HEAD(&wqe->list);
+		wqe->qp = NULL;
+	}
+	return wqe;
+}
+
+/*
+ * siw_srq_fetch_wqe()
+ *
+ * fetch one RQ wqe from the SRQ and inform user
+ * if SRQ lower watermark reached
+ */
+inline struct siw_wqe *siw_srq_fetch_wqe(struct siw_qp *qp)
+{
+	struct siw_wqe *wqe;
+	struct siw_srq *srq = qp->srq;
+	int qlen;
+
+	lock_srq(srq);
+	if (!list_empty(&srq->rq)) {
+		wqe = list_first_wqe(&srq->rq);
+		list_del_init(&wqe->list);
+		qlen = srq->max_wr - atomic_inc_return(&srq->space);
+		unlock_srq(srq);
+		wqe->qp = qp;
+		if (srq->armed && qlen < srq->limit) {
+			srq->armed = 0;
+			siw_async_srq_ev(srq, IB_EVENT_SRQ_LIMIT_REACHED);
+		}
+		return wqe;
+	}
+	unlock_srq(srq);
+	return NULL;
+}
+
+inline void siw_free_inline_sgl(struct siw_sge *sge, int num_sge)
+{
+	while (num_sge--) {
+		kfree(sge->mem.buf); /* kfree handles NULL pointers */
+		sge++;
+	}
+}
+
+inline void siw_unref_mem_sgl(struct siw_sge *sge, int num_sge)
+{
+	while (num_sge--) {
+		if (sge->mem.obj != NULL)
+			siw_mem_put(sge->mem.obj);
+		sge++;
+	}
+}
+
+
+void siw_wqe_put(struct siw_wqe *wqe)
+{
+	struct siw_qp *qp = wqe->qp;
+	unsigned long flags;
+
+	dprint(DBG_OBJ|DBG_WR, " WQE: %llu:, type: %d, p: %p\n",
+		(unsigned long long)wr_id(wqe), wr_type(wqe), wqe);
+
+	switch (wr_type(wqe)) {
+
+	case SIW_WR_SEND:
+	case SIW_WR_RDMA_WRITE:
+		if (likely(!SIW_INLINED_DATA(wqe)))
+			siw_unref_mem_sgl(wqe->wr.sgl.sge,
+					  wqe->wr.sgl.num_sge);
+		else
+			siw_free_inline_sgl(wqe->wr.sgl.sge,
+					    wqe->wr.sgl.num_sge);
+	case SIW_WR_RDMA_WRITE_WITH_IMM:
+	case SIW_WR_SEND_WITH_IMM:
+		kfree(wqe);
+		break;
+
+	case SIW_WR_RECEIVE:
+	case SIW_WR_RDMA_READ_REQ:
+		siw_unref_mem_sgl(wqe->wr.sgl.sge, wqe->wr.sgl.num_sge);
+		kfree(wqe);
+		break;
+
+	case SIW_WR_RDMA_READ_RESP:
+		siw_unref_mem_sgl(wqe->wr.sgl.sge, 1);
+		wqe->wr.sgl.sge[0].mem.obj = NULL;
+		/*
+		 * freelist can be accessed by tx processing (rresp done)
+		 * and rx softirq (get new wqe for rresponse scheduling)
+		 */
+		INIT_LIST_HEAD(&wqe->list);
+		spin_lock_irqsave(&wqe->qp->freelist_lock, flags);
+		list_add_tail(&wqe->list, &wqe->qp->wqe_freelist);
+		spin_unlock_irqrestore(&wqe->qp->freelist_lock, flags);
+		break;
+
+	default:
+		WARN_ON(1);
+	}
+	siw_qp_put(qp);
+}
diff --git a/drivers/infiniband/hw/siw/siw_obj.h b/drivers/infiniband/hw/siw/siw_obj.h
new file mode 100644
index 0000000..7b8af6c
--- /dev/null
+++ b/drivers/infiniband/hw/siw/siw_obj.h
@@ -0,0 +1,109 @@
+/*
+ * Software iWARP device driver for Linux
+ *
+ * Authors: Bernard Metzler <bmt@...ich.ibm.com>
+ *
+ * Copyright (c) 2008-2010, IBM Corporation
+ *
+ * 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
+ * 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.
+ *
+ *   - Neither the name of IBM nor the names of its contributors may be
+ *     used to endorse or promote products derived from this software without
+ *     specific prior written permission.
+ *
+ * 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.
+ */
+
+#ifndef _SIW_OBJ_H
+#define _SIW_OBJ_H
+
+#include <linux/idr.h>
+#include <linux/rwsem.h>
+#include <linux/version.h>
+#include <linux/sched.h>
+#include <linux/semaphore.h>
+
+#include <rdma/ib_verbs.h>
+
+#include "siw_debug.h"
+
+
+static inline struct siw_dev *siw_dev_ofa2siw(struct ib_device *ofa_dev)
+{
+	return container_of(ofa_dev, struct siw_dev, ofa_dev);
+}
+
+static inline void siw_cq_get(struct siw_cq *cq)
+{
+	kref_get(&cq->hdr.ref);
+	dprint(DBG_OBJ, "(CQ%d): New refcount: %d\n",
+		OBJ_ID(cq), atomic_read(&cq->hdr.ref.refcount));
+}
+static inline void siw_qp_get(struct siw_qp *qp)
+{
+	kref_get(&qp->hdr.ref);
+	dprint(DBG_OBJ, "(QP%d): New refcount: %d\n",
+		OBJ_ID(qp), atomic_read(&qp->hdr.ref.refcount));
+}
+static inline void siw_pd_get(struct siw_pd *pd)
+{
+	kref_get(&pd->hdr.ref);
+	dprint(DBG_OBJ, "(PD%d): New refcount: %d\n",
+		OBJ_ID(pd), atomic_read(&pd->hdr.ref.refcount));
+}
+static inline void siw_mem_get(struct siw_mem *mem)
+{
+	kref_get(&mem->hdr.ref);
+	dprint(DBG_OBJ|DBG_MM, "(MEM%d): New refcount: %d\n",
+		OBJ_ID(mem), atomic_read(&mem->hdr.ref.refcount));
+}
+
+extern void siw_remove_obj(spinlock_t *lock, struct idr *idr,
+				struct siw_objhdr *hdr);
+
+extern void siw_objhdr_init(struct siw_objhdr *);
+extern void siw_idr_init(struct siw_dev *);
+extern void siw_idr_release(struct siw_dev *);
+
+extern struct siw_cq *siw_cq_id2obj(struct siw_dev *, int);
+extern struct siw_qp *siw_qp_id2obj(struct siw_dev *, int);
+extern struct siw_mem *siw_mem_id2obj(struct siw_dev *, int);
+
+extern int siw_qp_add(struct siw_dev *, struct siw_qp *);
+extern int siw_cq_add(struct siw_dev *, struct siw_cq *);
+extern int siw_pd_add(struct siw_dev *, struct siw_pd *);
+extern int siw_mem_add(struct siw_dev *, struct siw_mem *m);
+
+extern struct siw_wqe *siw_wqe_get(struct siw_qp *, enum siw_wr_opcode);
+extern struct siw_wqe *siw_srq_wqe_get(struct siw_srq *);
+extern struct siw_wqe *siw_srq_fetch_wqe(struct siw_qp *);
+
+extern void siw_cq_put(struct siw_cq *);
+extern void siw_qp_put(struct siw_qp *);
+extern void siw_pd_put(struct siw_pd *);
+extern void siw_mem_put(struct siw_mem *);
+extern void siw_wqe_put(struct siw_wqe *);
+
+#endif
-- 
1.5.4.3

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