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rxrpc: Make rxrpc_kernel_get_srtt() indicate validity

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Fix rxrpc_kernel_get_srtt() to indicate the validity of the returned
smoothed RTT.  If we haven't had any valid samples yet, the SRTT isn't
useful.

Fixes: c410bf0193 ("rxrpc: Fix the excessive initial retransmission timeout")
Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2020-08-20 15:13:00 +01:00
parent 4700c4d80b
commit 1d4adfaf65
4 changed files with 18 additions and 8 deletions
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16
net/rxrpc/peer_object.c
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@@ -502,11 +502,21 @@ EXPORT_SYMBOL(rxrpc_kernel_get_peer);
* rxrpc_kernel_get_srtt - Get a call's peer smoothed RTT
* @sock: The socket on which the call is in progress.
* @call: The call to query
* @_srtt: Where to store the SRTT value.
*
* Get the call's peer smoothed RTT.
* Get the call's peer smoothed RTT in uS.
*/
u32 rxrpc_kernel_get_srtt(struct socket *sock, struct rxrpc_call *call)
bool rxrpc_kernel_get_srtt(struct socket *sock, struct rxrpc_call *call,
u32 *_srtt)
{
return call->peer->srtt_us >> 3;
struct rxrpc_peer *peer = call->peer;
if (peer->rtt_count == 0) {
*_srtt = 1000000; /* 1S */
return false;
}
*_srtt = call->peer->srtt_us >> 3;
return true;
}
EXPORT_SYMBOL(rxrpc_kernel_get_srtt);