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| author | David Howells <dhowells@redhat.com> | 2017-11-24 13:18:42 +0300 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2017-11-24 13:18:42 +0300 |
| commit | 415f44e43282a16ec0808c7ccfd401762e587437 (patch) | |
| tree | f6ccecc27740451b869f783156394569c3161a78 /net/rxrpc/ar-internal.h | |
| parent | bd1fdf8cfdf3fdbccd2b21c33ec649ebd7429af7 (diff) | |
| download | linux-415f44e43282a16ec0808c7ccfd401762e587437.tar.xz | |
rxrpc: Add keepalive for a call
We need to transmit a packet every so often to act as a keepalive for the
peer (which has a timeout from the last time it received a packet) and also
to prevent any intervening firewalls from closing the route.
Do this by resetting a timer every time we transmit a packet. If the timer
ever expires, we transmit a PING ACK packet and thereby also elicit a PING
RESPONSE ACK from the other side - which prevents our last-rx timeout from
expiring.
The timer is set to 1/6 of the last-rx timeout so that we can detect the
other side going away if it misses 6 replies in a row.
This is particularly necessary for servers where the processing of the
service function may take a significant amount of time.
Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'net/rxrpc/ar-internal.h')
| -rw-r--r-- | net/rxrpc/ar-internal.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h index 7e7b817c69f0..cdcbc798f921 100644 --- a/net/rxrpc/ar-internal.h +++ b/net/rxrpc/ar-internal.h @@ -519,6 +519,7 @@ struct rxrpc_call { unsigned long ack_lost_at; /* When ACK is figured as lost */ unsigned long resend_at; /* When next resend needs to happen */ unsigned long ping_at; /* When next to send a ping */ + unsigned long keepalive_at; /* When next to send a keepalive ping */ unsigned long expect_rx_by; /* When we expect to get a packet by */ unsigned long expect_req_by; /* When we expect to get a request DATA packet by */ unsigned long expect_term_by; /* When we expect call termination by */ |