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flow, tcp: Add handling for per-flow timers

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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>
This commit is contained in:
David Gibson 2024-01-16 11:50:36 +11:00 • committed by Stefano Brivio
parent b43e4483ed
commit 36dfa8b8fb
4 changed files with 21 additions and 12 deletions

16
flow.c
View file

@ -28,6 +28,9 @@ static_assert(ARRAY_SIZE(flow_type_str) == FLOW_NUM_TYPES,
/* Global Flow Table */
union flow flowtab[FLOW_MAX];
/* Last time the flow timers ran */
static struct timespec flow_timer_run;
/**
* flow_table_compact() - Perform compaction on flow table
* @c: Execution context
@ -86,13 +89,20 @@ void flow_log_(const struct flow_common *f, int pri, const char *fmt, ...)
}
/**
* flow_defer_handler() - Handler for per-flow deferred tasks
* flow_defer_handler() - Handler for per-flow deferred and timed tasks
* @c: Execution context
* @now: Current timestamp
*/
void flow_defer_handler(struct ctx *c)
void flow_defer_handler(struct ctx *c, const struct timespec *now)
{
bool timer = false;
union flow *flow;
if (timespec_diff_ms(now, &flow_timer_run) >= FLOW_TIMER_INTERVAL) {
timer = true;
flow_timer_run = *now;
}
for (flow = flowtab + c->flow_count - 1; flow >= flowtab; flow--) {
switch (flow->f.type) {
case FLOW_TCP:
@ -100,6 +110,8 @@ void flow_defer_handler(struct ctx *c)
break;
case FLOW_TCP_SPLICE:
tcp_splice_flow_defer(c, flow);
if (timer)
tcp_splice_timer(c, flow);
break;
default:
/* Assume other flow types don't need any handling */