Merge branch 'dctcp'

Daniel Borkmann says:

====================
net: tcp: DCTCP congestion control algorithm

This patch series adds support for the DataCenter TCP (DCTCP) congestion
control algorithm. Please see individual patches for the details.

The last patch adds DCTCP as a congestion control module, and previous
ones add needed infrastructure to extend the congestion control framework.

Joint work between Florian Westphal, Daniel Borkmann and Glenn Judd.

v3 -> v2:
 - No changes anywhere, just a resend as requested by Dave
 - Added Stephen's ACK
v1 -> v2:
 - Rebased to latest net-next
 - Addressed Eric's feedback, thanks!
  - Update stale comment wrt. DCTCP ECN usage
  - Don't call INET_ECN_xmit for every packet
 - Add dctcp ss/inetdiag support to expose internal stats to userspace
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 11 insertions, 2 deletions

diff --git a/include/uapi/linux/inet_diag.h b/include/uapi/linux/inet_diag.h
index bbde90fa5838..d65c0a09efd3 100644
--- a/include/uapi/linux/inet_diag.h
+++ b/include/uapi/linux/inet_diag.h
@@ -110,10 +110,10 @@ enum {
         INET_DIAG_TCLASS,
         INET_DIAG_SKMEMINFO,
         INET_DIAG_SHUTDOWN,
+        INET_DIAG_DCTCPINFO,
 };
 
-#define INET_DIAG_MAX INET_DIAG_SHUTDOWN
-
+#define INET_DIAG_MAX INET_DIAG_DCTCPINFO
 
 /* INET_DIAG_MEM */
 
@@ -133,5 +133,14 @@ struct tcpvegas_info {
         __u32   tcpv_minrtt;
 };
 
+/* INET_DIAG_DCTCPINFO */
+
+struct tcp_dctcp_info {
+        __u16   dctcp_enabled;
+        __u16   dctcp_ce_state;
+        __u32   dctcp_alpha;
+        __u32   dctcp_ab_ecn;
+        __u32   dctcp_ab_tot;
+};
 
 #endif /* _UAPI_INET_DIAG_H_ */