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, 32 insertions, 1 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)
 {