Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-18 10:01:43 +00:00
Code Issues Packages Projects Releases Wiki Activity

IB/ipoib: Improve latency in ipoib/cm connection formation

Browse Source 
Currently IPoIB connected mode queries the device to get the pkey table
entry during connection formation. This will increase the time taken to
form the connection, especially when limited pkeys are in use.  This gets
worse when multiple connection attempts are done in parallel.

Since ipoib interfaces are locked to a single pkey, use the pkey index
that was determined at link up time instead of searching for anything.

This improved the latency from 500ms to 1ms on an internal setup.

Link: https://lore.kernel.org/r/1618338965-16717-1-git-send-email-manjunath.b.patil@oracle.com
Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Manjunath Patil <manjunath.b.patil@oracle.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Manjunath Patil 2021-04-13 11:36:05 -07:00 committed by Jason Gunthorpe
parent 65d4801ae4
commit 338a010cb6
1 changed files with 1 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/infiniband/ulp/ipoib/ipoib_cm.c
View File

@ -1122,12 +1122,8 @@ static int ipoib_cm_modify_tx_init(struct net_device *dev,
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct ib_qp_attr qp_attr;
int qp_attr_mask, ret;
ret = ib_find_pkey(priv->ca, priv->port, priv->pkey, &qp_attr.pkey_index);
if (ret) {
ipoib_warn(priv, "pkey 0x%x not found: %d\n", priv->pkey, ret);
return ret;
}
qp_attr.pkey_index = priv->pkey_index;
qp_attr.qp_state = IB_QPS_INIT;
qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
qp_attr.port_num = priv->port;