From 107339d7f48c95ae8a7461150e143fc53b08fea9 Mon Sep 17 00:00:00 2001 From: Neal Cardwell Date: Sun, 23 Jul 2023 23:33:21 -0400 Subject: [PATCH] ss: display "ecn_low" if tcp_info tcpi_options TCPI_OPT_ECN_LOW bit is set Display "ecn_low" if the TCPI_OPT_ECN_LOW bit is set in the tcpi_options field in tcp_info. Signed-off-by: Neal Cardwell --- include/uapi/linux/tcp.h | 1 + misc/ss.c | 4 ++++ 2 files changed, 5 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 64 /* Low-latency ECN configured at init */ /* * Sender's congestion state indicating normal or abnormal situations --- a/misc/ss.c +++ b/misc/ss.c @@ -890,6 +890,7 @@ struct tcpstat { bool has_sack_opt; bool has_ecn_opt; bool has_ecnseen_opt; + bool has_ecn_low_opt; bool has_fastopen_opt; bool has_wscale_opt; bool app_limited; @@ -2635,6 +2636,8 @@ static void tcp_stats_print(struct tcpst out(" ecn"); if (s->has_ecnseen_opt) out(" ecnseen"); + if (s->has_ecn_low_opt) + out(" ecn_low"); if (s->has_fastopen_opt) out(" fastopen"); if (s->cong_alg[0]) @@ -3161,6 +3164,7 @@ static void tcp_show_info(const struct n s.has_sack_opt = TCPI_HAS_OPT(info, TCPI_OPT_SACK); s.has_ecn_opt = TCPI_HAS_OPT(info, TCPI_OPT_ECN); s.has_ecnseen_opt = TCPI_HAS_OPT(info, TCPI_OPT_ECN_SEEN); + s.has_ecn_low_opt = TCPI_HAS_OPT(info, TCPI_OPT_ECN_LOW); s.has_fastopen_opt = TCPI_HAS_OPT(info, TCPI_OPT_SYN_DATA); }