tcp: add TCP_CC_INFO socket option

Some Congestion Control modules can provide per flow information, but current way to get this information is to use netlink. Like TCP_INFO, let's add TCP_CC_INFO so that applications can issue a getsockopt() if they have a socket file descriptor, instead of playing complex netlink games. Sample usage would be : union tcp_cc_info info; socklen_t len = sizeof(info); if (getsockopt(fd, SOL_TCP, TCP_CC_INFO, &info, &len) == -1)

Eric Dumazet committed 11 years ago

Commit 6e9250f1 parent 64f40ff2 files · +22 −0Browse files

Showing the changes to include/uapi/linux (1 of 2 files). Show all

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include/uapi/linux/tcp.h+1−0

@@ -112,6 +112,7 @@ enum { · 111 unmodified lines
112	#define TCP_FASTOPEN 23 /* Enable FastOpen on listeners */	112	#define TCP_FASTOPEN 23 /* Enable FastOpen on listeners */
113	#define TCP_TIMESTAMP 24	113	#define TCP_TIMESTAMP 24
114	#define TCP_NOTSENT_LOWAT 25 /* limit number of unsent bytes in write queue */	114	#define TCP_NOTSENT_LOWAT 25 /* limit number of unsent bytes in write queue */
		115	#define TCP_CC_INFO 26 /* Get Congestion Control (optional) info */
115		116
116	struct tcp_repair_opt {	117	struct tcp_repair_opt {
117	__u32 opt_code;	118	__u32 opt_code;