IB/rdmavt: Add support for rvt_query_device function

With this commit, the drivers using rdmavt need not define query_device
function. But they should fill in the IB device attributes structure
rvt_dev_info.dparms.props

Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Harish Chegondi <harish.chegondi@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/sw/rdmavt/vt.c b/drivers/infiniband/sw/rdmavt/vt.c
index e75eb3d..f2b6438 100644 (file)
--- a/drivers/infiniband/sw/rdmavt/vt.c
+++ b/drivers/infiniband/sw/rdmavt/vt.c
@@ -68,10 +68,15 @@ static int rvt_query_device(struct ib_device *ibdev,
                            struct ib_device_attr *props,
                            struct ib_udata *uhw)
 {
+       struct rvt_dev_info *rdi = ib_to_rvt(ibdev);
+
+       if (uhw->inlen || uhw->outlen)
+               return -EINVAL;
        /*
-        * Return rvt_dev_info.props contents
+        * Return rvt_dev_info.dparms.props contents
         */
-       return -EOPNOTSUPP;
+       *props = rdi->dparms.props;
+       return 0;
 }
 
 static int rvt_modify_device(struct ib_device *device,

diff --git a/include/rdma/rdma_vt.h b/include/rdma/rdma_vt.h
index e412e67..725778a 100644 (file)
--- a/include/rdma/rdma_vt.h
+++ b/include/rdma/rdma_vt.h
@@ -245,7 +245,10 @@ struct rvt_dev_info {
         * allocating space for this structure.
         *
         * The driver will also be responsible for filling in certain members of
-        * dparms.props
+        * dparms.props. The driver needs to fill in dparms exactly as it would
+        * want values reported to a ULP. This will be returned to the caller
+        * in rdmavt's device. The driver should also therefore refrain from
+        * modifying this directly after registration with rdmavt.
         */
 
        /* Driver specific properties */