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>

*** 592,602 ****
                  tcp->tcp_rack_cur_max = 2;
          }
          mp = tcp_ack_mp(tcp);
  
          if (mp != NULL) {
!                 BUMP_LOCAL(tcp->tcp_obsegs);
                  TCPS_BUMP_MIB(tcps, tcpOutAck);
                  TCPS_BUMP_MIB(tcps, tcpOutAckDelayed);
                  tcp_send_data(tcp, mp);
          }
  }
--- 592,602 ----
                  tcp->tcp_rack_cur_max = 2;
          }
          mp = tcp_ack_mp(tcp);
  
          if (mp != NULL) {
!                 TCPS_BUMP_MIB(tcps, tcpHCOutSegs);
                  TCPS_BUMP_MIB(tcps, tcpOutAck);
                  TCPS_BUMP_MIB(tcps, tcpOutAckDelayed);
                  tcp_send_data(tcp, mp);
          }
  }
*** 851,860 ****
--- 851,861 ----
                          if (tcp->tcp_swnd == 0) {
                                  /* Extend window for zero window probe */
                                  tcp->tcp_swnd++;
                                  tcp->tcp_zero_win_probe = B_TRUE;
                                  TCPS_BUMP_MIB(tcps, tcpOutWinProbe);
+                                 tcp->tcp_cs.tcp_out_zwnd_probes++;
                          } else {
                                  /*
                                   * Handle timeout from sender SWS avoidance.
                                   * Reset our knowledge of the max send window
                                   * since the receiver might have reduced its
*** 1079,1088 ****
--- 1080,1091 ----
          }
  
          tcp->tcp_csuna = tcp->tcp_snxt;
          TCPS_BUMP_MIB(tcps, tcpRetransSegs);
          TCPS_UPDATE_MIB(tcps, tcpRetransBytes, mss);
+         tcp->tcp_cs.tcp_out_retrans_segs++;
+         tcp->tcp_cs.tcp_out_retrans_bytes += mss;
          tcp_send_data(tcp, mp);
  
  }
  
  /*