From 9d940cabd1eed8cdfa009d1530255578a1acd43c Mon Sep 17 00:00:00 2001 From: Neal Cardwell Date: Sun, 23 Jul 2023 23:25:34 -0400 Subject: [PATCH 18/19] tcp: export TCPI_OPT_ECN_LOW in tcp_info tcpi_options field Analogous to other important ECN information, export TCPI_OPT_ECN_LOW in tcp_info tcpi_options field. Signed-off-by: Neal Cardwell Change-Id: I08d8d8c7e8780e6e37df54038ee50301ac5a0320 Signed-off-by: Alexandre Frade --- include/uapi/linux/tcp.h | 1 + net/ipv4/tcp.c | 2 ++ 2 files changed, 3 insertions(+) --- a/include/uapi/linux/tcp.h +++ b/include/uapi/linux/tcp.h @@ -178,6 +178,7 @@ enum tcp_fastopen_client_fail { #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 */ +#define TCPI_OPT_ECN_LOW 128 /* Low-latency ECN configured at init */ /* * Sender's congestion state indicating normal or abnormal situations --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -4124,6 +4124,8 @@ void tcp_get_info(struct sock *sk, struc info->tcpi_options |= TCPI_OPT_ECN; if (tp->ecn_flags & TCP_ECN_SEEN) info->tcpi_options |= TCPI_OPT_ECN_SEEN; + if (tp->ecn_flags & TCP_ECN_LOW) + info->tcpi_options |= TCPI_OPT_ECN_LOW; if (tp->syn_data_acked) info->tcpi_options |= TCPI_OPT_SYN_DATA; if (tp->tcp_usec_ts)