DLPX-37540 TCP per-connection kernel statistics DLPX-37544 connstat command to display per-connection TCP statistics

*** 19,28 ****
--- 19,29 ----
   * 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
  
*** 203,212 ****
--- 204,233 ----
          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)