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xprtrdma: Modernize ops->connect

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Adapt and apply changes that were made to the TCP socket connect
code. See the following commits for details on the purpose of
these changes:

Commit 7196dbb02e ("SUNRPC: Allow changing of the TCP timeout parameters on the fly")
Commit 3851f1cdb2 ("SUNRPC: Limit the reconnect backoff timer to the max RPC message timeout")
Commit 02910177ae ("SUNRPC: Fix reconnection timeouts")

Some common transport code is moved to xprt.c to satisfy the code
duplication police.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever
2019-06-19 10:33:42 -04:00
committed by Anna Schumaker
parent 5828cebad1
commit 675dd90ad0
7 changed files with 121 additions and 36 deletions
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32
net/sunrpc/xprt.c
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@@ -850,6 +850,38 @@ void xprt_connect(struct rpc_task *task)
xprt_release_write(xprt, task);
}
/**
* xprt_reconnect_delay - compute the wait before scheduling a connect
* @xprt: transport instance
*
*/
unsigned long xprt_reconnect_delay(const struct rpc_xprt *xprt)
{
unsigned long start, now = jiffies;
start = xprt->stat.connect_start + xprt->reestablish_timeout;
if (time_after(start, now))
return start - now;
return 0;
}
EXPORT_SYMBOL_GPL(xprt_reconnect_delay);
/**
* xprt_reconnect_backoff - compute the new re-establish timeout
* @xprt: transport instance
* @init_to: initial reestablish timeout
*
*/
void xprt_reconnect_backoff(struct rpc_xprt *xprt, unsigned long init_to)
{
xprt->reestablish_timeout <<= 1;
if (xprt->reestablish_timeout > xprt->max_reconnect_timeout)
xprt->reestablish_timeout = xprt->max_reconnect_timeout;
if (xprt->reestablish_timeout < init_to)
xprt->reestablish_timeout = init_to;
}
EXPORT_SYMBOL_GPL(xprt_reconnect_backoff);
enum xprt_xid_rb_cmp {
XID_RB_EQUAL,
XID_RB_LEFT,