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>
diff --git a/drivers/infiniband/hw/mthca/mthca_provider.h b/drivers/infiniband/hw/mthca/mthca_provider.h
index 1e73947..2e7f521 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 @@
* - 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 @@
* 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 {