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net: tcp: Rate-limiting of neighbor reachability hints

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This commit implements simple rate-limiting for Neighbor Reachability
Hints in TCP module to prevent the potentially costly process of
frequent neighbor searches in the table, enhancing system performance.

Signed-off-by: Łukasz Duda <lukasz.duda@nordicsemi.no>
This commit is contained in:
Łukasz Duda 2024-01-31 20:35:49 +01:00 committed by Maureen Helm
parent 36a497b5e4
commit 838f33494e
2 changed files with 19 additions and 4 deletions
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20
subsys/net/ip/tcp.c
View file

@ -960,10 +960,22 @@ static void tcp_send_timer_cancel(struct tcp *conn)
static void tcp_nbr_reachability_hint(struct tcp *conn)
{
if (net_context_get_family(conn->context) == AF_INET6) {
net_ipv6_nbr_reachability_hint(
net_context_get_iface(conn->context),
&conn->dst.sin6.sin6_addr);
int64_t now;
struct net_if *iface;
if (net_context_get_family(conn->context) != AF_INET6) {
return;
}
now = k_uptime_get();
iface = net_context_get_iface(conn->context);
/* Ensure that Neighbor Reachability hints are rate-limited (using threshold
* of half of reachable time).
*/
if ((now - conn->last_nd_hint_time) > (net_if_ipv6_get_reachable_time(iface) / 2)) {
net_ipv6_nbr_reachability_hint(iface, &conn->dst.sin6.sin6_addr);
conn->last_nd_hint_time = now;
}
}

3
subsys/net/ip/tcp_private.h
View file

@ -297,6 +297,9 @@ struct tcp { /* TCP connection */
};
union tcp_endpoint src;
union tcp_endpoint dst;
#if defined(CONFIG_NET_TCP_IPV6_ND_REACHABILITY_HINT)
int64_t last_nd_hint_time;
#endif
size_t send_data_total;
size_t send_retries;
int unacked_len;