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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

4
flow.h
View file

@ -7,6 +7,8 @@
#ifndef FLOW_H
#define FLOW_H
#define FLOW_TIMER_INTERVAL 1000 /* ms */
/**
* enum flow_type - Different types of packet flows we track
*/
@ -67,7 +69,7 @@ static inline bool flow_sidx_eq(flow_sidx_t a, flow_sidx_t b)
union flow;
void flow_table_compact(struct ctx *c, union flow *hole);
void flow_defer_handler(struct ctx *c);
void flow_defer_handler(struct ctx *c, const struct timespec *now);
void flow_log_(const struct flow_common *f, int pri, const char *fmt, ...)
__attribute__((format(printf, 3, 4)));