flow, tcp: Add handling for per-flow timers

tcp_timer() scans the flow table so that it can run tcp_splice_timer() on
each spliced connection.  More generally, other flow types might want to
run similar timers in future.

We could add a flow_timer() analagous to tcp_timer(), udp_timer() etc.
However, this would need to scan the flow table, which we would have just
done in flow_defer_handler().  We'd prefer to just scan the flow table
once, dispatching both per-flow deferred events and per-flow timed events
if necessary.

So, extend flow_defer_handler() to do this.  For now we use the same timer
interval for all flow types (1s).  We can make that more flexible in future
if we need to.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 0 insertions, 6 deletions

diff --git a/tcp.c b/tcp.c
index 7065531..9fffafb 100644
--- a/tcp.c
+++ b/tcp.c
@@ -3171,8 +3171,6 @@ static int tcp_port_rebind_outbound(void *arg)
  */
 void tcp_timer(struct ctx *c, const struct timespec *now)
 {
-	union flow *flow;
-
 	(void)now;
 
 	if (c->mode == MODE_PASTA) {
@@ -3187,10 +3185,6 @@ void tcp_timer(struct ctx *c, const struct timespec *now)
 		}
 	}
 
-	for (flow = flowtab + c->flow_count - 1; flow >= flowtab; flow--)
-		if (flow->f.type == FLOW_TCP_SPLICE)
-			tcp_splice_timer(c, flow);
-
 	tcp_sock_refill_init(c);
 	if (c->mode == MODE_PASTA)
 		tcp_splice_refill(c);