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>

1 files changed, 35 insertions, 18 deletions

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 {