11547 Want connstat(1M) command to display per-connection TCP statistics
Portions contributed by: Cody Peter Mello <cody.mello@joyent.com>
Portions contributed by: Ahmed G <ahmedg@delphix.com>
Reviewed by: Jason King <jason.king@joyent.com>
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Dan McDonald <danmcd@joyent.com>

@@ -19,10 +19,11 @@
  * CDDL HEADER END
  */
 
 /*
  * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015 by Delphix. All rights reserved.
  */
 
 #ifndef _INET_TCP_STATS_H
 #define _INET_TCP_STATS_H
 

@@ -203,10 +204,30 @@
         int64_t                 tcp_sc_conn_cnt;
         mib2_tcp_t              tcp_sc_mib;
         tcp_stat_counter_t      tcp_sc_stats;
 } tcp_stats_cpu_t;
 
+/*
+ * Per-connection statistics. Some of these are also kept globally in the
+ * per-cpu tcp_sc_mib entry (see tcp_stats_cpu_t above). We need not maintain
+ * per-cpu versions of these stats since a connection is typically processed
+ * on the same CPU.
+ */
+typedef struct tcp_conn_stats {
+        uint64_t        tcp_in_data_inorder_bytes;
+        uint64_t        tcp_in_data_inorder_segs;
+        uint64_t        tcp_in_data_unorder_bytes;
+        uint64_t        tcp_in_data_unorder_segs;
+        uint64_t        tcp_in_zwnd_probes;
+
+        uint64_t        tcp_out_data_bytes;
+        uint64_t        tcp_out_data_segs;
+        uint64_t        tcp_out_retrans_bytes;
+        uint64_t        tcp_out_retrans_segs;
+        uint64_t        tcp_out_zwnd_probes;
+} tcp_conn_stats_t;
+
 #define TCPS_BUMP_MIB(tcps, x) \
         BUMP_MIB(&(tcps)->tcps_sc[CPU->cpu_seqid]->tcp_sc_mib, x)
 
 #define TCPS_UPDATE_MIB(tcps, x, y) \
         UPDATE_MIB(&(tcps)->tcps_sc[CPU->cpu_seqid]->tcp_sc_mib, x, y)