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IB/core: Read subnet_prefix in ib_query_port via cache. 

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.

Link: https://lore.kernel.org/r/20210712122625.1147-4-anand.a.khoje@oracle.com
Signed-off-by: Anand Khoje <anand.a.khoje@oracle.com>
Signed-off-by: Haakon Bugge <haakon.bugge@oracle.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Anand Khoje 2021-07-12 17:56:25 +05:30 committed by Jason Gunthorpe
parent 36721a6d4c
commit 21bfee9c0c
1 changed files with 2 additions and 6 deletions
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8
drivers/infiniband/core/device.c
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@ -2052,7 +2052,6 @@ 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));
@ -2065,11 +2064,8 @@ 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;
port_attr->subnet_prefix = be64_to_cpu(gid.global.subnet_prefix);
ib_get_cached_subnet_prefix(device, port_num,
&port_attr->subnet_prefix);
return 0;
}