RDMA/cxgb4: Remove kfifo usage

Using kfifos for ID management was limiting the number of QPs and
preventing NP384 MPI jobs.  So replace it with a simple bitmap
allocator.

Remove IDs from the IDR tables before deallocating them.  This bug was
causing the BUG_ON() in insert_handle() to fire because the ID was
getting reused before being removed from the IDR table.

Signed-off-by: Vipul Pandya <vipul@chelsio.com>
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

7 files changed, 203 insertions, 150 deletions

diff --git a/drivers/infiniband/hw/cxgb4/Makefile b/drivers/infiniband/hw/cxgb4/Makefile
index 46b878ca2c3..e11cf729994 100644
--- a/drivers/infiniband/hw/cxgb4/Makefile
+++ b/drivers/infiniband/hw/cxgb4/Makefile
@@ -2,4 +2,4 @@ ccflags-y := -Idrivers/net/ethernet/chelsio/cxgb4
 
 obj-$(CONFIG_INFINIBAND_CXGB4) += iw_cxgb4.o
 
-iw_cxgb4-y :=  device.o cm.o provider.o mem.o cq.o qp.o resource.o ev.o
+iw_cxgb4-y :=  device.o cm.o provider.o mem.o cq.o qp.o resource.o ev.o id_table.o
diff --git a/drivers/infiniband/hw/cxgb4/device.c b/drivers/infiniband/hw/cxgb4/device.c
index 85456291541..c8fd1d8b20e 100644
--- a/drivers/infiniband/hw/cxgb4/device.c
+++ b/drivers/infiniband/hw/cxgb4/device.c
@@ -252,25 +252,26 @@ static int stats_show(struct seq_file *seq, void *v)
 {
 	struct c4iw_dev *dev = seq->private;
 
-	seq_printf(seq, " Object: %10s %10s %10s\n", "Total", "Current", "Max");
-	seq_printf(seq, "     PDID: %10llu %10llu %10llu\n",
+	seq_printf(seq, "   Object: %10s %10s %10s %10s\n", "Total", "Current",
+		   "Max", "Fail");
+	seq_printf(seq, "     PDID: %10llu %10llu %10llu %10llu\n",
 			dev->rdev.stats.pd.total, dev->rdev.stats.pd.cur,
-			dev->rdev.stats.pd.max);
-	seq_printf(seq, "      QID: %10llu %10llu %10llu\n",
+			dev->rdev.stats.pd.max, dev->rdev.stats.pd.fail);
+	seq_printf(seq, "      QID: %10llu %10llu %10llu %10llu\n",
 			dev->rdev.stats.qid.total, dev->rdev.stats.qid.cur,
-			dev->rdev.stats.qid.max);
-	seq_printf(seq, "   TPTMEM: %10llu %10llu %10llu\n",
+			dev->rdev.stats.qid.max, dev->rdev.stats.qid.fail);
+	seq_printf(seq, "   TPTMEM: %10llu %10llu %10llu %10llu\n",
 			dev->rdev.stats.stag.total, dev->rdev.stats.stag.cur,
-			dev->rdev.stats.stag.max);
-	seq_printf(seq, "   PBLMEM: %10llu %10llu %10llu\n",
+			dev->rdev.stats.stag.max, dev->rdev.stats.stag.fail);
+	seq_printf(seq, "   PBLMEM: %10llu %10llu %10llu %10llu\n",
 			dev->rdev.stats.pbl.total, dev->rdev.stats.pbl.cur,
-			dev->rdev.stats.pbl.max);
-	seq_printf(seq, "   RQTMEM: %10llu %10llu %10llu\n",
+			dev->rdev.stats.pbl.max, dev->rdev.stats.pbl.fail);
+	seq_printf(seq, "   RQTMEM: %10llu %10llu %10llu %10llu\n",
 			dev->rdev.stats.rqt.total, dev->rdev.stats.rqt.cur,
-			dev->rdev.stats.rqt.max);
-	seq_printf(seq, "  OCQPMEM: %10llu %10llu %10llu\n",
+			dev->rdev.stats.rqt.max, dev->rdev.stats.rqt.fail);
+	seq_printf(seq, "  OCQPMEM: %10llu %10llu %10llu %10llu\n",
 			dev->rdev.stats.ocqp.total, dev->rdev.stats.ocqp.cur,
-			dev->rdev.stats.ocqp.max);
+			dev->rdev.stats.ocqp.max, dev->rdev.stats.ocqp.fail);
 	seq_printf(seq, "  DB FULL: %10llu\n", dev->rdev.stats.db_full);
 	seq_printf(seq, " DB EMPTY: %10llu\n", dev->rdev.stats.db_empty);
 	seq_printf(seq, "  DB DROP: %10llu\n", dev->rdev.stats.db_drop);
@@ -292,11 +293,17 @@ static ssize_t stats_clear(struct file *file, const char __user *buf,
 
 	mutex_lock(&dev->rdev.stats.lock);
 	dev->rdev.stats.pd.max = 0;
+	dev->rdev.stats.pd.fail = 0;
 	dev->rdev.stats.qid.max = 0;
+	dev->rdev.stats.qid.fail = 0;
 	dev->rdev.stats.stag.max = 0;
+	dev->rdev.stats.stag.fail = 0;
 	dev->rdev.stats.pbl.max = 0;
+	dev->rdev.stats.pbl.fail = 0;
 	dev->rdev.stats.rqt.max = 0;
+	dev->rdev.stats.rqt.fail = 0;
 	dev->rdev.stats.ocqp.max = 0;
+	dev->rdev.stats.ocqp.fail = 0;
 	dev->rdev.stats.db_full = 0;
 	dev->rdev.stats.db_empty = 0;
 	dev->rdev.stats.db_drop = 0;
@@ -350,8 +357,8 @@ void c4iw_release_dev_ucontext(struct c4iw_rdev *rdev,
 		entry = list_entry(pos, struct c4iw_qid_list, entry);
 		list_del_init(&entry->entry);
 		if (!(entry->qid & rdev->qpmask)) {
-			c4iw_put_resource(&rdev->resource.qid_fifo, entry->qid,
-					&rdev->resource.qid_fifo_lock);
+			c4iw_put_resource(&rdev->resource.qid_table,
+					  entry->qid);
 			mutex_lock(&rdev->stats.lock);
 			rdev->stats.qid.cur -= rdev->qpmask + 1;
 			mutex_unlock(&rdev->stats.lock);
diff --git a/drivers/infiniband/hw/cxgb4/id_table.c b/drivers/infiniband/hw/cxgb4/id_table.c
new file mode 100644
index 00000000000..f95e5df30db
--- /dev/null
+++ b/drivers/infiniband/hw/cxgb4/id_table.c
@@ -0,0 +1,112 @@
+/*
+ * Copyright (c) 2011 Chelsio Communications.  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/kernel.h>
+#include <linux/random.h>
+#include "iw_cxgb4.h"
+
+#define RANDOM_SKIP 16
+
+/*
+ * Trivial bitmap-based allocator. If the random flag is set, the
+ * allocator is designed to:
+ * - pseudo-randomize the id returned such that it is not trivially predictable.
+ * - avoid reuse of recently used id (at the expense of predictability)
+ */
+u32 c4iw_id_alloc(struct c4iw_id_table *alloc)
+{
+	unsigned long flags;
+	u32 obj;
+
+	spin_lock_irqsave(&alloc->lock, flags);
+
+	obj = find_next_zero_bit(alloc->table, alloc->max, alloc->last);
+	if (obj >= alloc->max)
+		obj = find_first_zero_bit(alloc->table, alloc->max);
+
+	if (obj < alloc->max) {
+		if (alloc->flags & C4IW_ID_TABLE_F_RANDOM)
+			alloc->last += random32() % RANDOM_SKIP;
+		else
+			alloc->last = obj + 1;
+		if (alloc->last >= alloc->max)
+			alloc->last = 0;
+		set_bit(obj, alloc->table);
+		obj += alloc->start;
+	} else
+		obj = -1;
+
+	spin_unlock_irqrestore(&alloc->lock, flags);
+	return obj;
+}
+
+void c4iw_id_free(struct c4iw_id_table *alloc, u32 obj)
+{
+	unsigned long flags;
+
+	obj -= alloc->start;
+	BUG_ON((int)obj < 0);
+
+	spin_lock_irqsave(&alloc->lock, flags);
+	clear_bit(obj, alloc->table);
+	spin_unlock_irqrestore(&alloc->lock, flags);
+}
+
+int c4iw_id_table_alloc(struct c4iw_id_table *alloc, u32 start, u32 num,
+			u32 reserved, u32 flags)
+{
+	int i;
+
+	alloc->start = start;
+	alloc->flags = flags;
+	if (flags & C4IW_ID_TABLE_F_RANDOM)
+		alloc->last = random32() % RANDOM_SKIP;
+	else
+		alloc->last = 0;
+	alloc->max  = num;
+	spin_lock_init(&alloc->lock);
+	alloc->table = kmalloc(BITS_TO_LONGS(num) * sizeof(long),
+				GFP_KERNEL);
+	if (!alloc->table)
+		return -ENOMEM;
+
+	bitmap_zero(alloc->table, num);
+	if (!(alloc->flags & C4IW_ID_TABLE_F_EMPTY))
+		for (i = 0; i < reserved; ++i)
+			set_bit(i, alloc->table);
+
+	return 0;
+}
+
+void c4iw_id_table_free(struct c4iw_id_table *alloc)
+{
+	kfree(alloc->table);
+}
diff --git a/drivers/infiniband/hw/cxgb4/iw_cxgb4.h b/drivers/infiniband/hw/cxgb4/iw_cxgb4.h
index 6818659f261..2d5b06b3217 100644
--- a/drivers/infiniband/hw/cxgb4/iw_cxgb4.h
+++ b/drivers/infiniband/hw/cxgb4/iw_cxgb4.h
@@ -45,7 +45,6 @@
 #include <linux/kref.h>
 #include <linux/timer.h>
 #include <linux/io.h>
-#include <linux/kfifo.h>
 
 #include <asm/byteorder.h>
 
@@ -79,13 +78,22 @@ static inline void *cplhdr(struct sk_buff *skb)
 	return skb->data;
 }
 
+#define C4IW_ID_TABLE_F_RANDOM 1       /* Pseudo-randomize the id's returned */
+#define C4IW_ID_TABLE_F_EMPTY  2       /* Table is initially empty */
+
+struct c4iw_id_table {
+	u32 flags;
+	u32 start;              /* logical minimal id */
+	u32 last;               /* hint for find */
+	u32 max;
+	spinlock_t lock;
+	unsigned long *table;
+};
+
 struct c4iw_resource {
-	struct kfifo tpt_fifo;
-	spinlock_t tpt_fifo_lock;
-	struct kfifo qid_fifo;
-	spinlock_t qid_fifo_lock;
-	struct kfifo pdid_fifo;
-	spinlock_t pdid_fifo_lock;
+	struct c4iw_id_table tpt_table;
+	struct c4iw_id_table qid_table;
+	struct c4iw_id_table pdid_table;
 };
 
 struct c4iw_qid_list {
@@ -107,6 +115,7 @@ struct c4iw_stat {
 	u64 total;
 	u64 cur;
 	u64 max;
+	u64 fail;
 };
 
 struct c4iw_stats {
@@ -253,7 +262,7 @@ static inline int _insert_handle(struct c4iw_dev *rhp, struct idr *idr,
 		if (lock)
 			spin_lock_irq(&rhp->lock);
 		ret = idr_get_new_above(idr, handle, id, &newid);
-		BUG_ON(newid != id);
+		BUG_ON(!ret && newid != id);
 		if (lock)
 			spin_unlock_irq(&rhp->lock);
 	} while (ret == -EAGAIN);
@@ -755,14 +764,20 @@ static inline int compute_wscale(int win)
 	return wscale;
 }
 
+u32 c4iw_id_alloc(struct c4iw_id_table *alloc);
+void c4iw_id_free(struct c4iw_id_table *alloc, u32 obj);
+int c4iw_id_table_alloc(struct c4iw_id_table *alloc, u32 start, u32 num,
+			u32 reserved, u32 flags);
+void c4iw_id_table_free(struct c4iw_id_table *alloc);
+
 typedef int (*c4iw_handler_func)(struct c4iw_dev *dev, struct sk_buff *skb);
 
 int c4iw_ep_redirect(void *ctx, struct dst_entry *old, struct dst_entry *new,
 		     struct l2t_entry *l2t);
 void c4iw_put_qpid(struct c4iw_rdev *rdev, u32 qpid,
 		   struct c4iw_dev_ucontext *uctx);
-u32 c4iw_get_resource(struct kfifo *fifo, spinlock_t *lock);
-void c4iw_put_resource(struct kfifo *fifo, u32 entry, spinlock_t *lock);
+u32 c4iw_get_resource(struct c4iw_id_table *id_table);
+void c4iw_put_resource(struct c4iw_id_table *id_table, u32 entry);
 int c4iw_init_resource(struct c4iw_rdev *rdev, u32 nr_tpt, u32 nr_pdid);
 int c4iw_init_ctrl_qp(struct c4iw_rdev *rdev);
 int c4iw_pblpool_create(struct c4iw_rdev *rdev);
diff --git a/drivers/infiniband/hw/cxgb4/mem.c b/drivers/infiniband/hw/cxgb4/mem.c
index 2a87379f52a..57e07c61ace 100644
--- a/drivers/infiniband/hw/cxgb4/mem.c
+++ b/drivers/infiniband/hw/cxgb4/mem.c
@@ -131,8 +131,7 @@ static int write_tpt_entry(struct c4iw_rdev *rdev, u32 reset_tpt_entry,
 	stag_idx = (*stag) >> 8;
 
 	if ((!reset_tpt_entry) && (*stag == T4_STAG_UNSET)) {
-		stag_idx = c4iw_get_resource(&rdev->resource.tpt_fifo,
-					     &rdev->resource.tpt_fifo_lock);
+		stag_idx = c4iw_get_resource(&rdev->resource.tpt_table);
 		if (!stag_idx)
 			return -ENOMEM;
 		mutex_lock(&rdev->stats.lock);
@@ -171,8 +170,7 @@ static int write_tpt_entry(struct c4iw_rdev *rdev, u32 reset_tpt_entry,
 				sizeof(tpt), &tpt);
 
 	if (reset_tpt_entry) {
-		c4iw_put_resource(&rdev->resource.tpt_fifo, stag_idx,
-				  &rdev->resource.tpt_fifo_lock);
+		c4iw_put_resource(&rdev->resource.tpt_table, stag_idx);
 		mutex_lock(&rdev->stats.lock);
 		rdev->stats.stag.cur -= 32;
 		mutex_unlock(&rdev->stats.lock);
@@ -695,8 +693,8 @@ int c4iw_dealloc_mw(struct ib_mw *mw)
 	mhp = to_c4iw_mw(mw);
 	rhp = mhp->rhp;
 	mmid = (mw->rkey) >> 8;
-	deallocate_window(&rhp->rdev, mhp->attr.stag);
 	remove_handle(rhp, &rhp->mmidr, mmid);
+	deallocate_window(&rhp->rdev, mhp->attr.stag);
 	kfree(mhp);
 	PDBG("%s ib_mw %p mmid 0x%x ptr %p\n", __func__, mw, mmid, mhp);
 	return 0;
@@ -798,12 +796,12 @@ int c4iw_dereg_mr(struct ib_mr *ib_mr)
 	mhp = to_c4iw_mr(ib_mr);
 	rhp = mhp->rhp;
 	mmid = mhp->attr.stag >> 8;
+	remove_handle(rhp, &rhp->mmidr, mmid);
 	dereg_mem(&rhp->rdev, mhp->attr.stag, mhp->attr.pbl_size,
 		       mhp->attr.pbl_addr);
 	if (mhp->attr.pbl_size)
 		c4iw_pblpool_free(&mhp->rhp->rdev, mhp->attr.pbl_addr,
 				  mhp->attr.pbl_size << 3);
-	remove_handle(rhp, &rhp->mmidr, mmid);
 	if (mhp->kva)
 		kfree((void *) (unsigned long) mhp->kva);
 	if (mhp->umem)
diff --git a/drivers/infiniband/hw/cxgb4/provider.c b/drivers/infiniband/hw/cxgb4/provider.c
index 8d58736f9b4..fe98a0a5543 100644
--- a/drivers/infiniband/hw/cxgb4/provider.c
+++ b/drivers/infiniband/hw/cxgb4/provider.c
@@ -188,8 +188,7 @@ static int c4iw_deallocate_pd(struct ib_pd *pd)
 	php = to_c4iw_pd(pd);
 	rhp = php->rhp;
 	PDBG("%s ibpd %p pdid 0x%x\n", __func__, pd, php->pdid);
-	c4iw_put_resource(&rhp->rdev.resource.pdid_fifo, php->pdid,
-			  &rhp->rdev.resource.pdid_fifo_lock);
+	c4iw_put_resource(&rhp->rdev.resource.pdid_table, php->pdid);
 	mutex_lock(&rhp->rdev.stats.lock);
 	rhp->rdev.stats.pd.cur--;
 	mutex_unlock(&rhp->rdev.stats.lock);
@@ -207,14 +206,12 @@ static struct ib_pd *c4iw_allocate_pd(struct ib_device *ibdev,
 
 	PDBG("%s ibdev %p\n", __func__, ibdev);
 	rhp = (struct c4iw_dev *) ibdev;
-	pdid =  c4iw_get_resource(&rhp->rdev.resource.pdid_fifo,
-				  &rhp->rdev.resource.pdid_fifo_lock);
+	pdid =  c4iw_get_resource(&rhp->rdev.resource.pdid_table);
 	if (!pdid)
 		return ERR_PTR(-EINVAL);
 	php = kzalloc(sizeof(*php), GFP_KERNEL);
 	if (!php) {
-		c4iw_put_resource(&rhp->rdev.resource.pdid_fifo, pdid,
-				  &rhp->rdev.resource.pdid_fifo_lock);
+		c4iw_put_resource(&rhp->rdev.resource.pdid_table, pdid);
 		return ERR_PTR(-ENOMEM);
 	}
 	php->pdid = pdid;
diff --git a/drivers/infiniband/hw/cxgb4/resource.c b/drivers/infiniband/hw/cxgb4/resource.c
index 1b948d192d3..cdef4d7fb6d 100644
--- a/drivers/infiniband/hw/cxgb4/resource.c
+++ b/drivers/infiniband/hw/cxgb4/resource.c
@@ -30,96 +30,25 @@
  * SOFTWARE.
  */
 /* Crude resource management */
-#include <linux/kernel.h>
-#include <linux/random.h>
-#include <linux/slab.h>
-#include <linux/kfifo.h>
 #include <linux/spinlock.h>
-#include <linux/errno.h>
 #include <linux/genalloc.h>
 #include <linux/ratelimit.h>
 #include "iw_cxgb4.h"
 
-#define RANDOM_SIZE 16
-
-static int __c4iw_init_resource_fifo(struct kfifo *fifo,
-				   spinlock_t *fifo_lock,
-				   u32 nr, u32 skip_low,
-				   u32 skip_high,
-				   int random)
-{
-	u32 i, j, entry = 0, idx;
-	u32 random_bytes;
-	u32 rarray[16];
-	spin_lock_init(fifo_lock);
-
-	if (kfifo_alloc(fifo, nr * sizeof(u32), GFP_KERNEL))
-		return -ENOMEM;
-
-	for (i = 0; i < skip_low + skip_high; i++)
-		kfifo_in(fifo, (unsigned char *) &entry, sizeof(u32));
-	if (random) {
-		j = 0;
-		random_bytes = random32();
-		for (i = 0; i < RANDOM_SIZE; i++)
-			rarray[i] = i + skip_low;
-		for (i = skip_low + RANDOM_SIZE; i < nr - skip_high; i++) {
-			if (j >= RANDOM_SIZE) {
-				j = 0;
-				random_bytes = random32();
-			}
-			idx = (random_bytes >> (j * 2)) & 0xF;
-			kfifo_in(fifo,
-				(unsigned char *) &rarray[idx],
-				sizeof(u32));
-			rarray[idx] = i;
-			j++;
-		}
-		for (i = 0; i < RANDOM_SIZE; i++)
-			kfifo_in(fifo,
-				(unsigned char *) &rarray[i],
-				sizeof(u32));
-	} else
-		for (i = skip_low; i < nr - skip_high; i++)
-			kfifo_in(fifo, (unsigned char *) &i, sizeof(u32));
-
-	for (i = 0; i < skip_low + skip_high; i++)
-		if (kfifo_out_locked(fifo, (unsigned char *) &entry,
-				     sizeof(u32), fifo_lock))
-			break;
-	return 0;
-}
-
-static int c4iw_init_resource_fifo(struct kfifo *fifo, spinlock_t * fifo_lock,
-				   u32 nr, u32 skip_low, u32 skip_high)
-{
-	return __c4iw_init_resource_fifo(fifo, fifo_lock, nr, skip_low,
-					  skip_high, 0);
-}
-
-static int c4iw_init_resource_fifo_random(struct kfifo *fifo,
-				   spinlock_t *fifo_lock,
-				   u32 nr, u32 skip_low, u32 skip_high)
-{
-	return __c4iw_init_resource_fifo(fifo, fifo_lock, nr, skip_low,
-					  skip_high, 1);
-}
-
-static int c4iw_init_qid_fifo(struct c4iw_rdev *rdev)
+static int c4iw_init_qid_table(struct c4iw_rdev *rdev)
 {
 	u32 i;
 
-	spin_lock_init(&rdev->resource.qid_fifo_lock);
-
-	if (kfifo_alloc(&rdev->resource.qid_fifo, rdev->lldi.vr->qp.size *
-			sizeof(u32), GFP_KERNEL))
+	if (c4iw_id_table_alloc(&rdev->resource.qid_table,
+				rdev->lldi.vr->qp.start,
+				rdev->lldi.vr->qp.size,
+				rdev->lldi.vr->qp.size, 0))
 		return -ENOMEM;
 
 	for (i = rdev->lldi.vr->qp.start;
-	     i < rdev->lldi.vr->qp.start + rdev->lldi.vr->qp.size; i++)
+		i < rdev->lldi.vr->qp.start + rdev->lldi.vr->qp.size; i++)
 		if (!(i & rdev->qpmask))
-			kfifo_in(&rdev->resource.qid_fifo,
-				    (unsigned char *) &i, sizeof(u32));
+			c4iw_id_free(&rdev->resource.qid_table, i);
 	return 0;
 }
 
@@ -127,44 +56,42 @@ static int c4iw_init_qid_fifo(struct c4iw_rdev *rdev)
 int c4iw_init_resource(struct c4iw_rdev *rdev, u32 nr_tpt, u32 nr_pdid)
 {
 	int err = 0;
-	err = c4iw_init_resource_fifo_random(&rdev->resource.tpt_fifo,
-					     &rdev->resource.tpt_fifo_lock,
-					     nr_tpt, 1, 0);
+	err = c4iw_id_table_alloc(&rdev->resource.tpt_table, 0, nr_tpt, 1,
+					C4IW_ID_TABLE_F_RANDOM);
 	if (err)
 		goto tpt_err;
-	err = c4iw_init_qid_fifo(rdev);
+	err = c4iw_init_qid_table(rdev);
 	if (err)
 		goto qid_err;
-	err = c4iw_init_resource_fifo(&rdev->resource.pdid_fifo,
-				      &rdev->resource.pdid_fifo_lock,
-				      nr_pdid, 1, 0);
+	err = c4iw_id_table_alloc(&rdev->resource.pdid_table, 0,
+					nr_pdid, 1, 0);
 	if (err)
 		goto pdid_err;
 	return 0;
-pdid_err:
-	kfifo_free(&rdev->resource.qid_fifo);
-qid_err:
-	kfifo_free(&rdev->resource.tpt_fifo);
-tpt_err:
+ pdid_err:
+	c4iw_id_table_free(&rdev->resource.qid_table);
+ qid_err:
+	c4iw_id_table_free(&rdev->resource.tpt_table);
+ tpt_err:
 	return -ENOMEM;
 }
 
 /*
  * returns 0 if no resource available
  */
-u32 c4iw_get_resource(struct kfifo *fifo, spinlock_t *lock)
+u32 c4iw_get_resource(struct c4iw_id_table *id_table)
 {
 	u32 entry;
-	if (kfifo_out_locked(fifo, (unsigned char *) &entry, sizeof(u32), lock))
-		return entry;
-	else
+	entry = c4iw_id_alloc(id_table);
+	if (entry == (u32)(-1))
 		return 0;
+	return entry;
 }
 
-void c4iw_put_resource(struct kfifo *fifo, u32 entry, spinlock_t *lock)
+void c4iw_put_resource(struct c4iw_id_table *id_table, u32 entry)
 {
 	PDBG("%s entry 0x%x\n", __func__, entry);
-	kfifo_in_locked(fifo, (unsigned char *) &entry, sizeof(u32), lock);
+	c4iw_id_free(id_table, entry);
 }
 
 u32 c4iw_get_cqid(struct c4iw_rdev *rdev, struct c4iw_dev_ucontext *uctx)
@@ -181,8 +108,7 @@ u32 c4iw_get_cqid(struct c4iw_rdev *rdev, struct c4iw_dev_ucontext *uctx)
 		qid = entry->qid;
 		kfree(entry);
 	} else {
-		qid = c4iw_get_resource(&rdev->resource.qid_fifo,
-					&rdev->resource.qid_fifo_lock);
+		qid = c4iw_get_resource(&rdev->resource.qid_table);
 		if (!qid)
 			goto out;
 		mutex_lock(&rdev->stats.lock);
@@ -252,8 +178,7 @@ u32 c4iw_get_qpid(struct c4iw_rdev *rdev, struct c4iw_dev_ucontext *uctx)
 		qid = entry->qid;
 		kfree(entry);
 	} else {
-		qid = c4iw_get_resource(&rdev->resource.qid_fifo,
-					&rdev->resource.qid_fifo_lock);
+		qid = c4iw_get_resource(&rdev->resource.qid_table);
 		if (!qid)
 			goto out;
 		mutex_lock(&rdev->stats.lock);
@@ -311,9 +236,9 @@ void c4iw_put_qpid(struct c4iw_rdev *rdev, u32 qid,
 
 void c4iw_destroy_resource(struct c4iw_resource *rscp)
 {
-	kfifo_free(&rscp->tpt_fifo);
-	kfifo_free(&rscp->qid_fifo);
-	kfifo_free(&rscp->pdid_fifo);
+	c4iw_id_table_free(&rscp->tpt_table);
+	c4iw_id_table_free(&rscp->qid_table);
+	c4iw_id_table_free(&rscp->pdid_table);
 }
 
 /*
@@ -326,16 +251,14 @@ u32 c4iw_pblpool_alloc(struct c4iw_rdev *rdev, int size)
 {
 	unsigned long addr = gen_pool_alloc(rdev->pbl_pool, size);
 	PDBG("%s addr 0x%x size %d\n", __func__, (u32)addr, size);
-	if (!addr)
-		printk_ratelimited(KERN_WARNING MOD "%s: Out of PBL memory\n",
-		       pci_name(rdev->lldi.pdev));
+	mutex_lock(&rdev->stats.lock);
 	if (addr) {
-		mutex_lock(&rdev->stats.lock);
 		rdev->stats.pbl.cur += roundup(size, 1 << MIN_PBL_SHIFT);
 		if (rdev->stats.pbl.cur > rdev->stats.pbl.max)
 			rdev->stats.pbl.max = rdev->stats.pbl.cur;
-		mutex_unlock(&rdev->stats.lock);
-	}
+	} else
+		rdev->stats.pbl.fail++;
+	mutex_unlock(&rdev->stats.lock);
 	return (u32)addr;
 }
 
@@ -401,13 +324,14 @@ u32 c4iw_rqtpool_alloc(struct c4iw_rdev *rdev, int size)
 	if (!addr)
 		printk_ratelimited(KERN_WARNING MOD "%s: Out of RQT memory\n",
 		       pci_name(rdev->lldi.pdev));
+	mutex_lock(&rdev->stats.lock);
 	if (addr) {
-		mutex_lock(&rdev->stats.lock);
 		rdev->stats.rqt.cur += roundup(size << 6, 1 << MIN_RQT_SHIFT);
 		if (rdev->stats.rqt.cur > rdev->stats.rqt.max)
 			rdev->stats.rqt.max = rdev->stats.rqt.cur;
-		mutex_unlock(&rdev->stats.lock);
-	}
+	} else
+		rdev->stats.rqt.fail++;
+	mutex_unlock(&rdev->stats.lock);
 	return (u32)addr;
 }