tcp: report ECN_SEEN in tcp_info (b5c5693b) · Commits · 戴 / test

Allows ss command (iproute2) to display "ecnseen" if at least one packet with ECT(0) or ECT(1) or ECN was received by this socket. "ecn" means ECN was negotiated at session establishment (TCP level) "ecnseen" means we received at least one packet with ECT fields set (IP level) ss -i ... ESTAB 0 0 192.168.20.110:22 192.168.20.144:38016 ino:5950 sk:f178e400 mem:(r0,w0,f0,t0) ts sack ecn ecnseen bic wscale:7,8 rto:210 rtt:12.5/7.5 cwnd:10 send 9.3Mbps rcv_space:14480 Signed-off-by:

Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by:

David S. Miller <davem@davemloft.net>

include/linux/tcp.h

+2 −1

Original line number	Diff line number	Diff line
		@@ -111,7 +111,8 @@ enum {
		#define TCPI_OPT_TIMESTAMPS 1
		#define TCPI_OPT_SACK 2
		#define TCPI_OPT_WSCALE 4
		#define TCPI_OPT_ECN 8
		#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 */

		enum tcp_ca_state {
		TCP_CA_Open = 0,

net/ipv4/tcp.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -2457,6 +2457,8 @@ void tcp_get_info(struct sock sk, struct tcp_info info)

		if (tp->ecn_flags & TCP_ECN_OK)
		info->tcpi_options \|= TCPI_OPT_ECN;
		if (tp->ecn_flags & TCP_ECN_SEEN)
		info->tcpi_options \|= TCPI_OPT_ECN_SEEN;

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

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