diff options
| author | Chia-Yu Chang <chia-yu.chang@nokia-bell-labs.com> | 2026-01-31 23:25:13 +0100 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2026-02-03 15:13:25 +0100 |
| commit | 4fa4ac5e584841c0f9b01c2f7dd0c2e3caa8bca0 (patch) | |
| tree | 8f013c16118c69e87c97306fd73455feb9a6e310 /net | |
| parent | 1247fb19cafee6f9fa350ae378e4e1e9965cc253 (diff) | |
tcp: accecn: add tcpi_ecn_mode and tcpi_option2 in tcp_info
Add 2-bit tcpi_ecn_mode feild within tcp_info to indicate which ECN
mode is negotiated: ECN_MODE_DISABLED, ECN_MODE_RFC3168, ECN_MODE_ACCECN,
or ECN_MODE_PENDING. This is done by utilizing available bits from
tcpi_accecn_opt_seen (reduced from 16 bits to 2 bits) and
tcpi_accecn_fail_mode (reduced from 16 bits to 4 bits).
Also, an extra 24-bit tcpi_options2 field is identified to represent
newer options and connection features, as all 8 bits of tcpi_options
field have been used.
Signed-off-by: Chia-Yu Chang <chia-yu.chang@nokia-bell-labs.com>
Co-developed-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260131222515.8485-14-chia-yu.chang@nokia-bell-labs.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/tcp.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 49f1029b5f8b..6ce03a9adb4a 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -4373,6 +4373,14 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info) if (tp->rto_stamp) info->tcpi_total_rto_time += tcp_clock_ms() - tp->rto_stamp; + if (tcp_ecn_disabled(tp)) + info->tcpi_ecn_mode = TCPI_ECN_MODE_DISABLED; + else if (tcp_ecn_mode_rfc3168(tp)) + info->tcpi_ecn_mode = TCPI_ECN_MODE_RFC3168; + else if (tcp_ecn_mode_accecn(tp)) + info->tcpi_ecn_mode = TCPI_ECN_MODE_ACCECN; + else if (tcp_ecn_mode_pending(tp)) + info->tcpi_ecn_mode = TCPI_ECN_MODE_PENDING; info->tcpi_accecn_fail_mode = tp->accecn_fail_mode; info->tcpi_accecn_opt_seen = tp->saw_accecn_opt; info->tcpi_received_ce = tp->received_ce; |