Commit a77a0f5c authored Oct 20, 2023 by Eric Dumazet Committed by David S. Miller Oct 23, 2023

tcp: add TCPI_OPT_USEC_TS



Add the ability to report in tcp_info.tcpi_options if
a flow is using usec resolution in TCP TS val.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 614e8316

include/uapi/linux/tcp.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -170,6 +170,7 @@ enum tcp_fastopen_client_fail {
		#define TCPI_OPT_ECN 8 /* ECN was negociated at TCP session init */
		#define TCPI_OPT_ECN_SEEN 16 /* we received at least one packet with ECT */
		#define TCPI_OPT_SYN_DATA 32 /* SYN-ACK acked data in SYN sent or rcvd */
		#define TCPI_OPT_USEC_TS 64 /* usec timestamps */

		/*
		* Sender's congestion state indicating normal or abnormal situations

net/ipv4/tcp.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -3760,6 +3760,8 @@ void tcp_get_info(struct sock sk, struct tcp_info info)
		info->tcpi_options \|= TCPI_OPT_ECN_SEEN;
		if (tp->syn_data_acked)
		info->tcpi_options \|= TCPI_OPT_SYN_DATA;
		if (tp->tcp_usec_ts)
		info->tcpi_options \|= TCPI_OPT_USEC_TS;

		info->tcpi_rto = jiffies_to_usecs(icsk->icsk_rto);
		info->tcpi_ato = jiffies_to_usecs(min_t(u32, icsk->icsk_ack.ato,