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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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4
fs/afs/fs_probe.c
View File

@ -161,8 +161,8 @@ responded:
}
}
rtt_us = rxrpc_kernel_get_srtt(call->net->socket, call->rxcall);
if (rtt_us < server->probe.rtt) {
if (rxrpc_kernel_get_srtt(call->net->socket, call->rxcall, &rtt_us) &&
rtt_us < server->probe.rtt) {
server->probe.rtt = rtt_us;
server->rtt = rtt_us;
alist->preferred = index;

4
fs/afs/vl_probe.c
View File

@ -92,8 +92,8 @@ responded:
}
}
rtt_us = rxrpc_kernel_get_srtt(call->net->socket, call->rxcall);
if (rtt_us < server->probe.rtt) {
if (rxrpc_kernel_get_srtt(call->net->socket, call->rxcall, &rtt_us) &&
rtt_us < server->probe.rtt) {
server->probe.rtt = rtt_us;
alist->preferred = index;
have_result = true;

2
include/net/af_rxrpc.h
View File

@ -59,7 +59,7 @@ bool rxrpc_kernel_abort_call(struct socket *, struct rxrpc_call *,
void rxrpc_kernel_end_call(struct socket *, struct rxrpc_call *);
void rxrpc_kernel_get_peer(struct socket *, struct rxrpc_call *,
struct sockaddr_rxrpc *);
u32 rxrpc_kernel_get_srtt(struct socket *, struct rxrpc_call *);
bool rxrpc_kernel_get_srtt(struct socket *, struct rxrpc_call *, u32 *);
int rxrpc_kernel_charge_accept(struct socket *, rxrpc_notify_rx_t,
rxrpc_user_attach_call_t, unsigned long, gfp_t,
unsigned int);

16
net/rxrpc/peer_object.c
View File

@ -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);