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 <ncardwell@google.com> Change-Id: I08d8d8c7e8780e6e37df54038ee50301ac5a0320 Signed-off-by: Alexandre Frade <kernel@xanmod.org>
xanmod · Aug 16, 2023 · 0be8827 · 0be8827
1 parent 9ea1c2d
commit 0be8827
Show file tree

Hide file tree

Showing 2 changed files with 3 additions and 0 deletions.
diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h
@@ -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_ECN_LOW	64 /* Low-latency ECN configured at init */
 
 /*
  * Sender's congestion state indicating normal or abnormal situations

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
@@ -3885,6 +3885,8 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info)
 		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;