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[v6,for-next,2/2] IB/core: Read subnet_prefix in ib_query_port via cache.

Message ID 20210627064753.1012-3-anand.a.khoje@oracle.com (mailing list archive)
State Superseded
Headers show
Series IB/core: Obtaining subnet_prefix from cache in | expand

Commit Message

Anand Khoje June 27, 2021, 6:47 a.m. UTC 
ib_query_port() calls device->ops.query_port() to get the port
attributes. The method of querying is device driver specific.
The same function calls device->ops.query_gid() to get the GID and
extract the subnet_prefix (gid_prefix).

The GID and subnet_prefix are stored in a cache. But they do not get
read from the cache if the device is an Infiniband device. The
following change takes advantage of the cached subnet_prefix.
Testing with RDBMS has shown a significant improvement in performance
with this change.

Fixes: fad61ad ("IB/core: Add subnet prefix to port info")
Signed-off-by: Anand Khoje <anand.a.khoje@oracle.com>
Signed-off-by: Haakon Bugge <haakon.bugge@oracle.com>
---
 drivers/infiniband/core/device.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index fa20b18..9ad10c8 100644
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -2050,7 +2050,6 @@  static int __ib_query_port(struct ib_device *device,
 			   u32 port_num,
 			   struct ib_port_attr *port_attr)
 {
-	union ib_gid gid = {};
 	int err;
 
 	memset(port_attr, 0, sizeof(*port_attr));
@@ -2063,11 +2062,9 @@  static int __ib_query_port(struct ib_device *device,
 	    IB_LINK_LAYER_INFINIBAND)
 		return 0;
 
-	err = device->ops.query_gid(device, port_num, 0, &gid);
-	if (err)
-		return err;
+	ib_get_cached_subnet_prefix(device, port_num,
+				    &port_attr->subnet_prefix);
 
-	port_attr->subnet_prefix = be64_to_cpu(gid.global.subnet_prefix);
 	return 0;
 }