IB/mthca: Add device-specific support for resizing CQs

Add low-level driver support for resizing CQs (both kernel and
userspace) to mthca.

Signed-off-by: Roland Dreier <rolandd@cisco.com>

7 files changed, 308 insertions, 52 deletions

diff --git a/drivers/infiniband/hw/mthca/mthca_cmd.c b/drivers/infiniband/hw/mthca/mthca_cmd.c
index 2825615ce81c..7780e974cfb5 100644
--- a/drivers/infiniband/hw/mthca/mthca_cmd.c
+++ b/drivers/infiniband/hw/mthca/mthca_cmd.c
@@ -1,7 +1,7 @@
 /*
  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
- * Copyright (c) 2005 Cisco Systems. All rights reserved.
+ * Copyright (c) 2005, 2006 Cisco Systems.  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
@@ -1514,6 +1514,37 @@ int mthca_HW2SW_CQ(struct mthca_dev *dev, struct mthca_mailbox *mailbox,
 			     CMD_TIME_CLASS_A, status);
 }
 
+int mthca_RESIZE_CQ(struct mthca_dev *dev, int cq_num, u32 lkey, u8 log_size,
+		    u8 *status)
+{
+	struct mthca_mailbox *mailbox;
+	__be32 *inbox;
+	int err;
+
+#define RESIZE_CQ_IN_SIZE		0x40
+#define RESIZE_CQ_LOG_SIZE_OFFSET	0x0c
+#define RESIZE_CQ_LKEY_OFFSET		0x1c
+
+	mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
+	if (IS_ERR(mailbox))
+		return PTR_ERR(mailbox);
+	inbox = mailbox->buf;
+
+	memset(inbox, 0, RESIZE_CQ_IN_SIZE);
+	/*
+	 * Leave start address fields zeroed out -- mthca assumes that
+	 * MRs for CQs always start at virtual address 0.
+	 */
+	MTHCA_PUT(inbox, log_size, RESIZE_CQ_LOG_SIZE_OFFSET);
+	MTHCA_PUT(inbox, lkey,     RESIZE_CQ_LKEY_OFFSET);
+
+	err = mthca_cmd(dev, mailbox->dma, cq_num, 1, CMD_RESIZE_CQ,
+			CMD_TIME_CLASS_B, status);
+
+	mthca_free_mailbox(dev, mailbox);
+	return err;
+}
+
 int mthca_SW2HW_SRQ(struct mthca_dev *dev, struct mthca_mailbox *mailbox,
 		    int srq_num, u8 *status)
 {
diff --git a/drivers/infiniband/hw/mthca/mthca_cmd.h b/drivers/infiniband/hw/mthca/mthca_cmd.h
index 18175bec84c2..3473b8235ee0 100644
--- a/drivers/infiniband/hw/mthca/mthca_cmd.h
+++ b/drivers/infiniband/hw/mthca/mthca_cmd.h
@@ -1,6 +1,7 @@
 /*
  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2006 Cisco Systems.  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
@@ -298,6 +299,8 @@ int mthca_SW2HW_CQ(struct mthca_dev *dev, struct mthca_mailbox *mailbox,
 		   int cq_num, u8 *status);
 int mthca_HW2SW_CQ(struct mthca_dev *dev, struct mthca_mailbox *mailbox,
 		   int cq_num, u8 *status);
+int mthca_RESIZE_CQ(struct mthca_dev *dev, int cq_num, u32 lkey, u8 log_size,
+		    u8 *status);
 int mthca_SW2HW_SRQ(struct mthca_dev *dev, struct mthca_mailbox *mailbox,
 		    int srq_num, u8 *status);
 int mthca_HW2SW_SRQ(struct mthca_dev *dev, struct mthca_mailbox *mailbox,
diff --git a/drivers/infiniband/hw/mthca/mthca_cq.c b/drivers/infiniband/hw/mthca/mthca_cq.c
index 78d9cc119f33..76aabc5bf371 100644
--- a/drivers/infiniband/hw/mthca/mthca_cq.c
+++ b/drivers/infiniband/hw/mthca/mthca_cq.c
@@ -1,7 +1,7 @@
 /*
  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
- * Copyright (c) 2005 Cisco Systems, Inc. All rights reserved.
+ * Copyright (c) 2005, 2006 Cisco Systems, Inc. All rights reserved.
  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
  *
@@ -150,24 +150,29 @@ struct mthca_err_cqe {
 #define MTHCA_ARBEL_CQ_DB_REQ_NOT      (2 << 24)
 #define MTHCA_ARBEL_CQ_DB_REQ_NOT_MULT (3 << 24)
 
-static inline struct mthca_cqe *get_cqe(struct mthca_cq *cq, int entry)
+static inline struct mthca_cqe *get_cqe_from_buf(struct mthca_cq_buf *buf,
+						 int entry)
 {
-	if (cq->is_direct)
-		return cq->queue.direct.buf + (entry * MTHCA_CQ_ENTRY_SIZE);
+	if (buf->is_direct)
+		return buf->queue.direct.buf + (entry * MTHCA_CQ_ENTRY_SIZE);
 	else
-		return cq->queue.page_list[entry * MTHCA_CQ_ENTRY_SIZE / PAGE_SIZE].buf
+		return buf->queue.page_list[entry * MTHCA_CQ_ENTRY_SIZE / PAGE_SIZE].buf
 			+ (entry * MTHCA_CQ_ENTRY_SIZE) % PAGE_SIZE;
 }
 
-static inline struct mthca_cqe *cqe_sw(struct mthca_cq *cq, int i)
+static inline struct mthca_cqe *get_cqe(struct mthca_cq *cq, int entry)
+{
+	return get_cqe_from_buf(&cq->buf, entry);
+}
+
+static inline struct mthca_cqe *cqe_sw(struct mthca_cqe *cqe)
 {
-	struct mthca_cqe *cqe = get_cqe(cq, i);
 	return MTHCA_CQ_ENTRY_OWNER_HW & cqe->owner ? NULL : cqe;
 }
 
 static inline struct mthca_cqe *next_cqe_sw(struct mthca_cq *cq)
 {
-	return cqe_sw(cq, cq->cons_index & cq->ibcq.cqe);
+	return cqe_sw(get_cqe(cq, cq->cons_index & cq->ibcq.cqe));
 }
 
 static inline void set_cqe_hw(struct mthca_cqe *cqe)
@@ -289,7 +294,7 @@ void mthca_cq_clean(struct mthca_dev *dev, u32 cqn, u32 qpn,
 	 * from our QP and therefore don't need to be checked.
 	 */
 	for (prod_index = cq->cons_index;
-	     cqe_sw(cq, prod_index & cq->ibcq.cqe);
+	     cqe_sw(get_cqe(cq, prod_index & cq->ibcq.cqe));
 	     ++prod_index)
 		if (prod_index == cq->cons_index + cq->ibcq.cqe)
 			break;
@@ -324,6 +329,53 @@ void mthca_cq_clean(struct mthca_dev *dev, u32 cqn, u32 qpn,
 		wake_up(&cq->wait);
 }
 
+void mthca_cq_resize_copy_cqes(struct mthca_cq *cq)
+{
+	int i;
+
+	/*
+	 * In Tavor mode, the hardware keeps the consumer and producer
+	 * indices mod the CQ size.  Since we might be making the CQ
+	 * bigger, we need to deal with the case where the producer
+	 * index wrapped around before the CQ was resized.
+	 */
+	if (!mthca_is_memfree(to_mdev(cq->ibcq.device)) &&
+	    cq->ibcq.cqe < cq->resize_buf->cqe) {
+		cq->cons_index &= cq->ibcq.cqe;
+		if (cqe_sw(get_cqe(cq, cq->ibcq.cqe)))
+			cq->cons_index -= cq->ibcq.cqe + 1;
+	}
+
+	for (i = cq->cons_index; cqe_sw(get_cqe(cq, i & cq->ibcq.cqe)); ++i)
+		memcpy(get_cqe_from_buf(&cq->resize_buf->buf,
+					i & cq->resize_buf->cqe),
+		       get_cqe(cq, i & cq->ibcq.cqe), MTHCA_CQ_ENTRY_SIZE);
+}
+
+int mthca_alloc_cq_buf(struct mthca_dev *dev, struct mthca_cq_buf *buf, int nent)
+{
+	int ret;
+	int i;
+
+	ret = mthca_buf_alloc(dev, nent * MTHCA_CQ_ENTRY_SIZE,
+			      MTHCA_MAX_DIRECT_CQ_SIZE,
+			      &buf->queue, &buf->is_direct,
+			      &dev->driver_pd, 1, &buf->mr);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < nent; ++i)
+		set_cqe_hw(get_cqe_from_buf(buf, i));
+
+	return 0;
+}
+
+void mthca_free_cq_buf(struct mthca_dev *dev, struct mthca_cq_buf *buf, int cqe)
+{
+	mthca_buf_free(dev, (cqe + 1) * MTHCA_CQ_ENTRY_SIZE, &buf->queue,
+		       buf->is_direct, &buf->mr);
+}
+
 static void handle_error_cqe(struct mthca_dev *dev, struct mthca_cq *cq,
 			     struct mthca_qp *qp, int wqe_index, int is_send,
 			     struct mthca_err_cqe *cqe,
@@ -609,11 +661,14 @@ int mthca_poll_cq(struct ib_cq *ibcq, int num_entries,
 
 	spin_lock_irqsave(&cq->lock, flags);
 
-	for (npolled = 0; npolled < num_entries; ++npolled) {
+	npolled = 0;
+repoll:
+	while (npolled < num_entries) {
 		err = mthca_poll_one(dev, cq, &qp,
 				     &freed, entry + npolled);
 		if (err)
 			break;
+		++npolled;
 	}
 
 	if (freed) {
@@ -621,6 +676,42 @@ int mthca_poll_cq(struct ib_cq *ibcq, int num_entries,
 		update_cons_index(dev, cq, freed);
 	}
 
+	/*
+	 * If a CQ resize is in progress and we discovered that the
+	 * old buffer is empty, then peek in the new buffer, and if
+	 * it's not empty, switch to the new buffer and continue
+	 * polling there.
+	 */
+	if (unlikely(err == -EAGAIN && cq->resize_buf &&
+		     cq->resize_buf->state == CQ_RESIZE_READY)) {
+		/*
+		 * In Tavor mode, the hardware keeps the producer
+		 * index modulo the CQ size.  Since we might be making
+		 * the CQ bigger, we need to mask our consumer index
+		 * using the size of the old CQ buffer before looking
+		 * in the new CQ buffer.
+		 */
+		if (!mthca_is_memfree(dev))
+			cq->cons_index &= cq->ibcq.cqe;
+
+		if (cqe_sw(get_cqe_from_buf(&cq->resize_buf->buf,
+					    cq->cons_index & cq->resize_buf->cqe))) {
+			struct mthca_cq_buf tbuf;
+			int tcqe;
+
+			tbuf         = cq->buf;
+			tcqe         = cq->ibcq.cqe;
+			cq->buf      = cq->resize_buf->buf;
+			cq->ibcq.cqe = cq->resize_buf->cqe;
+
+			cq->resize_buf->buf   = tbuf;
+			cq->resize_buf->cqe   = tcqe;
+			cq->resize_buf->state = CQ_RESIZE_SWAPPED;
+
+			goto repoll;
+		}
+	}
+
 	spin_unlock_irqrestore(&cq->lock, flags);
 
 	return err == 0 || err == -EAGAIN ? npolled : err;
@@ -679,22 +770,14 @@ int mthca_arbel_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify notify)
 	return 0;
 }
 
-static void mthca_free_cq_buf(struct mthca_dev *dev, struct mthca_cq *cq)
-{
-	mthca_buf_free(dev, (cq->ibcq.cqe + 1) * MTHCA_CQ_ENTRY_SIZE,
-		       &cq->queue, cq->is_direct, &cq->mr);
-}
-
 int mthca_init_cq(struct mthca_dev *dev, int nent,
 		  struct mthca_ucontext *ctx, u32 pdn,
 		  struct mthca_cq *cq)
 {
-	int size = nent * MTHCA_CQ_ENTRY_SIZE;
 	struct mthca_mailbox *mailbox;
 	struct mthca_cq_context *cq_context;
 	int err = -ENOMEM;
 	u8 status;
-	int i;
 
 	cq->ibcq.cqe  = nent - 1;
 	cq->is_kernel = !ctx;
@@ -732,14 +815,9 @@ int mthca_init_cq(struct mthca_dev *dev, int nent,
 	cq_context = mailbox->buf;
 
 	if (cq->is_kernel) {
-		err = mthca_buf_alloc(dev, size, MTHCA_MAX_DIRECT_CQ_SIZE,
-				      &cq->queue, &cq->is_direct,
-				      &dev->driver_pd, 1, &cq->mr);
+		err = mthca_alloc_cq_buf(dev, &cq->buf, nent);
 		if (err)
 			goto err_out_mailbox;
-
-		for (i = 0; i < nent; ++i)
-			set_cqe_hw(get_cqe(cq, i));
 	}
 
 	spin_lock_init(&cq->lock);
@@ -758,7 +836,7 @@ int mthca_init_cq(struct mthca_dev *dev, int nent,
 	cq_context->error_eqn       = cpu_to_be32(dev->eq_table.eq[MTHCA_EQ_ASYNC].eqn);
 	cq_context->comp_eqn        = cpu_to_be32(dev->eq_table.eq[MTHCA_EQ_COMP].eqn);
 	cq_context->pd              = cpu_to_be32(pdn);
-	cq_context->lkey            = cpu_to_be32(cq->mr.ibmr.lkey);
+	cq_context->lkey            = cpu_to_be32(cq->buf.mr.ibmr.lkey);
 	cq_context->cqn             = cpu_to_be32(cq->cqn);
 
 	if (mthca_is_memfree(dev)) {
@@ -796,7 +874,7 @@ int mthca_init_cq(struct mthca_dev *dev, int nent,
 
 err_out_free_mr:
 	if (cq->is_kernel)
-		mthca_free_cq_buf(dev, cq);
+		mthca_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe);
 
 err_out_mailbox:
 	mthca_free_mailbox(dev, mailbox);
@@ -862,7 +940,7 @@ void mthca_free_cq(struct mthca_dev *dev,
 	wait_event(cq->wait, !atomic_read(&cq->refcount));
 
 	if (cq->is_kernel) {
-		mthca_free_cq_buf(dev, cq);
+		mthca_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe);
 		if (mthca_is_memfree(dev)) {
 			mthca_free_db(dev, MTHCA_DB_TYPE_CQ_ARM,    cq->arm_db_index);
 			mthca_free_db(dev, MTHCA_DB_TYPE_CQ_SET_CI, cq->set_ci_db_index);
diff --git a/drivers/infiniband/hw/mthca/mthca_dev.h b/drivers/infiniband/hw/mthca/mthca_dev.h
index c98628ab8a09..d827558c27be 100644
--- a/drivers/infiniband/hw/mthca/mthca_dev.h
+++ b/drivers/infiniband/hw/mthca/mthca_dev.h
@@ -1,7 +1,7 @@
 /*
  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
- * Copyright (c) 2005 Cisco Systems.  All rights reserved.
+ * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
  *
@@ -470,6 +470,9 @@ void mthca_cq_event(struct mthca_dev *dev, u32 cqn,
 		    enum ib_event_type event_type);
 void mthca_cq_clean(struct mthca_dev *dev, u32 cqn, u32 qpn,
 		    struct mthca_srq *srq);
+void mthca_cq_resize_copy_cqes(struct mthca_cq *cq);
+int mthca_alloc_cq_buf(struct mthca_dev *dev, struct mthca_cq_buf *buf, int nent);
+void mthca_free_cq_buf(struct mthca_dev *dev, struct mthca_cq_buf *buf, int cqe);
 
 int mthca_alloc_srq(struct mthca_dev *dev, struct mthca_pd *pd,
 		    struct ib_srq_attr *attr, struct mthca_srq *srq);
diff --git a/drivers/infiniband/hw/mthca/mthca_provider.c b/drivers/infiniband/hw/mthca/mthca_provider.c
index e88e39aef85a..cd2038bdd1ac 100644
--- a/drivers/infiniband/hw/mthca/mthca_provider.c
+++ b/drivers/infiniband/hw/mthca/mthca_provider.c
@@ -1,7 +1,7 @@
 /*
  * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
- * Copyright (c) 2005 Cisco Systems. All rights reserved.
+ * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
  *
@@ -669,9 +669,9 @@ static struct ib_cq *mthca_create_cq(struct ib_device *ibdev, int entries,
 	}
 
 	if (context) {
-		cq->mr.ibmr.lkey    = ucmd.lkey;
-		cq->set_ci_db_index = ucmd.set_db_index;
-		cq->arm_db_index    = ucmd.arm_db_index;
+		cq->buf.mr.ibmr.lkey = ucmd.lkey;
+		cq->set_ci_db_index  = ucmd.set_db_index;
+		cq->arm_db_index     = ucmd.arm_db_index;
 	}
 
 	for (nent = 1; nent <= entries; nent <<= 1)
@@ -689,6 +689,8 @@ static struct ib_cq *mthca_create_cq(struct ib_device *ibdev, int entries,
 		goto err_free;
 	}
 
+	cq->resize_buf = NULL;
+
 	return &cq->ibcq;
 
 err_free:
@@ -707,6 +709,121 @@ err_unmap_set:
 	return ERR_PTR(err);
 }
 
+static int mthca_alloc_resize_buf(struct mthca_dev *dev, struct mthca_cq *cq,
+				  int entries)
+{
+	int ret;
+
+	spin_lock_irq(&cq->lock);
+	if (cq->resize_buf) {
+		ret = -EBUSY;
+		goto unlock;
+	}
+
+	cq->resize_buf = kmalloc(sizeof *cq->resize_buf, GFP_ATOMIC);
+	if (!cq->resize_buf) {
+		ret = -ENOMEM;
+		goto unlock;
+	}
+
+	cq->resize_buf->state = CQ_RESIZE_ALLOC;
+
+	ret = 0;
+
+unlock:
+	spin_unlock_irq(&cq->lock);
+
+	if (ret)
+		return ret;
+
+	ret = mthca_alloc_cq_buf(dev, &cq->resize_buf->buf, entries);
+	if (ret) {
+		spin_lock_irq(&cq->lock);
+		kfree(cq->resize_buf);
+		cq->resize_buf = NULL;
+		spin_unlock_irq(&cq->lock);
+		return ret;
+	}
+
+	cq->resize_buf->cqe = entries - 1;
+
+	spin_lock_irq(&cq->lock);
+	cq->resize_buf->state = CQ_RESIZE_READY;
+	spin_unlock_irq(&cq->lock);
+
+	return 0;
+}
+
+static int mthca_resize_cq(struct ib_cq *ibcq, int entries, struct ib_udata *udata)
+{
+	struct mthca_dev *dev = to_mdev(ibcq->device);
+	struct mthca_cq *cq = to_mcq(ibcq);
+	struct mthca_resize_cq ucmd;
+	u32 lkey;
+	u8 status;
+	int ret;
+
+	if (entries < 1 || entries > dev->limits.max_cqes)
+		return -EINVAL;
+
+	entries = roundup_pow_of_two(entries + 1);
+	if (entries == ibcq->cqe + 1)
+		return 0;
+
+	if (cq->is_kernel) {
+		ret = mthca_alloc_resize_buf(dev, cq, entries);
+		if (ret)
+			return ret;
+		lkey = cq->resize_buf->buf.mr.ibmr.lkey;
+	} else {
+		if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd))
+			return -EFAULT;
+		lkey = ucmd.lkey;
+	}
+
+	ret = mthca_RESIZE_CQ(dev, cq->cqn, lkey, long_log2(entries), &status);
+	if (status)
+		ret = -EINVAL;
+
+	if (ret) {
+		if (cq->resize_buf) {
+			mthca_free_cq_buf(dev, &cq->resize_buf->buf,
+					  cq->resize_buf->cqe);
+			kfree(cq->resize_buf);
+			spin_lock_irq(&cq->lock);
+			cq->resize_buf = NULL;
+			spin_unlock_irq(&cq->lock);
+		}
+		return ret;
+	}
+
+	if (cq->is_kernel) {
+		struct mthca_cq_buf tbuf;
+		int tcqe;
+
+		spin_lock_irq(&cq->lock);
+		if (cq->resize_buf->state == CQ_RESIZE_READY) {
+			mthca_cq_resize_copy_cqes(cq);
+			tbuf         = cq->buf;
+			tcqe         = cq->ibcq.cqe;
+			cq->buf      = cq->resize_buf->buf;
+			cq->ibcq.cqe = cq->resize_buf->cqe;
+		} else {
+			tbuf = cq->resize_buf->buf;
+			tcqe = cq->resize_buf->cqe;
+		}
+
+		kfree(cq->resize_buf);
+		cq->resize_buf = NULL;
+		spin_unlock_irq(&cq->lock);
+
+		mthca_free_cq_buf(dev, &tbuf, tcqe);
+	} else
+		ibcq->cqe = entries - 1;
+
+	return 0;
+}
+
 static int mthca_destroy_cq(struct ib_cq *cq)
 {
 	if (cq->uobject) {
@@ -1113,6 +1230,7 @@ int mthca_register_device(struct mthca_dev *dev)
 		(1ull << IB_USER_VERBS_CMD_DEREG_MR)		|
 		(1ull << IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL)	|
 		(1ull << IB_USER_VERBS_CMD_CREATE_CQ)		|
+		(1ull << IB_USER_VERBS_CMD_RESIZE_CQ)		|
 		(1ull << IB_USER_VERBS_CMD_DESTROY_CQ)		|
 		(1ull << IB_USER_VERBS_CMD_CREATE_QP)		|
 		(1ull << IB_USER_VERBS_CMD_MODIFY_QP)		|
@@ -1154,6 +1272,7 @@ int mthca_register_device(struct mthca_dev *dev)
 	dev->ib_dev.modify_qp            = mthca_modify_qp;
 	dev->ib_dev.destroy_qp           = mthca_destroy_qp;
 	dev->ib_dev.create_cq            = mthca_create_cq;
+	dev->ib_dev.resize_cq            = mthca_resize_cq;
 	dev->ib_dev.destroy_cq           = mthca_destroy_cq;
 	dev->ib_dev.poll_cq              = mthca_poll_cq;
 	dev->ib_dev.get_dma_mr           = mthca_get_dma_mr;
diff --git a/drivers/infiniband/hw/mthca/mthca_provider.h b/drivers/infiniband/hw/mthca/mthca_provider.h
index 1e73947b4702..2e7f52136965 100644
--- a/drivers/infiniband/hw/mthca/mthca_provider.h
+++ b/drivers/infiniband/hw/mthca/mthca_provider.h
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
- * Copyright (c) 2005 Cisco Systems.  All rights reserved.
+ * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
  *
  * This software is available to you under a choice of one of two
@@ -164,9 +164,11 @@ struct mthca_ah {
  * - wait_event until ref count is zero
  *
  * It is the consumer's responsibilty to make sure that no QP
- * operations (WQE posting or state modification) are pending when the
+ * operations (WQE posting or state modification) are pending when a
  * QP is destroyed.  Also, the consumer must make sure that calls to
- * qp_modify are serialized.
+ * qp_modify are serialized.  Similarly, the consumer is responsible
+ * for ensuring that no CQ resize operations are pending when a CQ
+ * is destroyed.
  *
  * Possible optimizations (wait for profile data to see if/where we
  * have locks bouncing between CPUs):
@@ -176,25 +178,40 @@ struct mthca_ah {
  *   send queue and one for the receive queue)
  */
 
+struct mthca_cq_buf {
+	union mthca_buf		queue;
+	struct mthca_mr		mr;
+	int			is_direct;
+};
+
+struct mthca_cq_resize {
+	struct mthca_cq_buf	buf;
+	int			cqe;
+	enum {
+		CQ_RESIZE_ALLOC,
+		CQ_RESIZE_READY,
+		CQ_RESIZE_SWAPPED
+	}			state;
+};
+
 struct mthca_cq {
-	struct ib_cq           ibcq;
-	spinlock_t             lock;
-	atomic_t               refcount;
-	int                    cqn;
-	u32                    cons_index;
-	int                    is_direct;
-	int                    is_kernel;
+	struct ib_cq		ibcq;
+	spinlock_t		lock;
+	atomic_t		refcount;
+	int			cqn;
+	u32			cons_index;
+	struct mthca_cq_buf	buf;
+	struct mthca_cq_resize *resize_buf;
+	int			is_kernel;
 
 	/* Next fields are Arbel only */
-	int                    set_ci_db_index;
-	__be32                *set_ci_db;
-	int                    arm_db_index;
-	__be32                *arm_db;
-	int                    arm_sn;
+	int			set_ci_db_index;
+	__be32		       *set_ci_db;
+	int			arm_db_index;
+	__be32		       *arm_db;
+	int			arm_sn;
 
-	union mthca_buf        queue;
-	struct mthca_mr        mr;
-	wait_queue_head_t      wait;
+	wait_queue_head_t	wait;
 };
 
 struct mthca_srq {
diff --git a/drivers/infiniband/hw/mthca/mthca_user.h b/drivers/infiniband/hw/mthca/mthca_user.h
index bb015c6494c4..02cc0a766f3a 100644
--- a/drivers/infiniband/hw/mthca/mthca_user.h
+++ b/drivers/infiniband/hw/mthca/mthca_user.h
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
- * Copyright (c) 2005 Cisco Systems.  All rights reserved.
+ * Copyright (c) 2005, 2006 Cisco Systems.  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
@@ -75,6 +75,11 @@ struct mthca_create_cq_resp {
 	__u32 reserved;
 };
 
+struct mthca_resize_cq {
+	__u32 lkey;
+	__u32 reserved;
+};
+
 struct mthca_create_srq {
 	__u32 lkey;
 	__u32 db_index;