IB/uverbs: Support for query SRQ from userspace

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

diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index 4cbef8c..38a66fb 100644 (file)
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -2,6 +2,7 @@
  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
  * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
  * Copyright (c) 2005 PathScale, Inc.  All rights reserved.
+ * Copyright (c) 2006 Mellanox Technologies.  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
@@ -1923,6 +1924,49 @@ out:
        return ret ? ret : in_len;
 }
 
+ssize_t ib_uverbs_query_srq(struct ib_uverbs_file *file,
+                           const char __user *buf,
+                           int in_len, int out_len)
+{
+       struct ib_uverbs_query_srq      cmd;
+       struct ib_uverbs_query_srq_resp resp;
+       struct ib_srq_attr              attr;
+       struct ib_srq                   *srq;
+       int                             ret;
+
+       if (out_len < sizeof resp)
+               return -ENOSPC;
+
+       if (copy_from_user(&cmd, buf, sizeof cmd))
+               return -EFAULT;
+
+       mutex_lock(&ib_uverbs_idr_mutex);
+
+       srq = idr_find(&ib_uverbs_srq_idr, cmd.srq_handle);
+       if (srq && srq->uobject->context == file->ucontext)
+               ret = ib_query_srq(srq, &attr);
+       else
+               ret = -EINVAL;
+
+       mutex_unlock(&ib_uverbs_idr_mutex);
+
+       if (ret)
+               goto out;
+
+       memset(&resp, 0, sizeof resp);
+
+       resp.max_wr    = attr.max_wr;
+       resp.max_sge   = attr.max_sge;
+       resp.srq_limit = attr.srq_limit;
+
+       if (copy_to_user((void __user *) (unsigned long) cmd.response,
+                        &resp, sizeof resp))
+               ret = -EFAULT;
+
+out:
+       return ret ? ret : in_len;
+}
+
 ssize_t ib_uverbs_destroy_srq(struct ib_uverbs_file *file,
                              const char __user *buf, int in_len,
                              int out_len)