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| author | Anand Khoje <anand.a.khoje@oracle.com> | 2021-07-12 14:26:25 +0200 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@nvidia.com> | 2021-07-16 15:57:28 +0200 |
| commit | 21bfee9c0c7754408b1f311bffe304caf3e62250 (patch) | |
| tree | db088266ac160eb8e9f922b9e5ff2dbdc034669a /drivers/infiniband/core | |
| parent | IB/core: Shifting initialization of device->cache_lock (diff) | |
| download | linux-21bfee9c0c7754408b1f311bffe304caf3e62250.tar.xz linux-21bfee9c0c7754408b1f311bffe304caf3e62250.zip | |
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>
Diffstat (limited to 'drivers/infiniband/core')
| -rw-r--r-- | drivers/infiniband/core/device.c | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c index ba0ad7241772..9056f48bdca6 100644 --- a/drivers/infiniband/core/device.c +++ b/drivers/infiniband/core/device.c @@ -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; } |