IB: Add userspace support for resizing CQs

[linux-2.6.git] / drivers / infiniband / core / uverbs_cmd.c

diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index 407b6284d7d5c502c88595f1f2820bf856aac1c8..be1cef1b3116c3fff9462f3ea2ca4ac907063a77 100644 (file)
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -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.
  * Copyright (c) 2005 PathScale, Inc.  All rights reserved.
  *
  * This software is available to you under a choice of one of two
@@ -675,6 +675,46 @@ err:
        return ret;
 }
 
+ssize_t ib_uverbs_resize_cq(struct ib_uverbs_file *file,
+                           const char __user *buf, int in_len,
+                           int out_len)
+{
+       struct ib_uverbs_resize_cq      cmd;
+       struct ib_uverbs_resize_cq_resp resp;
+       struct ib_udata                 udata;
+       struct ib_cq                    *cq;
+       int                             ret = -EINVAL;
+
+       if (copy_from_user(&cmd, buf, sizeof cmd))
+               return -EFAULT;
+
+       INIT_UDATA(&udata, buf + sizeof cmd,
+                  (unsigned long) cmd.response + sizeof resp,
+                  in_len - sizeof cmd, out_len - sizeof resp);
+
+       mutex_lock(&ib_uverbs_idr_mutex);
+
+       cq = idr_find(&ib_uverbs_cq_idr, cmd.cq_handle);
+       if (!cq || cq->uobject->context != file->ucontext || !cq->device->resize_cq)
+               goto out;
+
+       ret = cq->device->resize_cq(cq, cmd.cqe, &udata);
+       if (ret)
+               goto out;
+
+       memset(&resp, 0, sizeof resp);
+       resp.cqe = cq->cqe;
+
+       if (copy_to_user((void __user *) (unsigned long) cmd.response,
+                        &resp, sizeof resp))
+               ret = -EFAULT;
+
+out:
+       mutex_unlock(&ib_uverbs_idr_mutex);
+
+       return ret ? ret : in_len;
+}
+
 ssize_t ib_uverbs_poll_cq(struct ib_uverbs_file *file,
                          const char __user *buf, int in_len,
                          int out_len)