debug code in retransmits_timed_out

net/ipv4/tcp_timer.c

@@ -26,6 +26,10 @@
 #include <linux/gfp.h>
 #include <net/tcp.h>
 
+#if defined(CONFIG_XEN_SME) && defined(CONFIG_PACER_TCP)
+extern int (*lnk_tx_adjust_urg) (struct sock *sk, struct sk_buff *skb);
+#endif
+
 int sysctl_tcp_thin_linear_timeouts __read_mostly;
 
 /**
@@ -159,11 +163,23 @@ static bool retransmits_timed_out(struct sock *sk,
 {
 	unsigned int linear_backoff_thresh, start_ts;
 	unsigned int rto_base = syn_set ? TCP_TIMEOUT_INIT : TCP_RTO_MIN;
+#if defined(CONFIG_XEN_SME) && defined(CONFIG_PACER_TCP)
+  char dbg[256];
+#endif
 
 	if (!inet_csk(sk)->icsk_retransmits)
 		return false;
 
 	start_ts = tcp_sk(sk)->retrans_stamp;
+#if defined(CONFIG_XEN_SME) && defined(CONFIG_PACER_TCP)
+  if (lnk_tx_adjust_urg && !start_ts && !tcp_write_queue_head(sk)) {
+    memset(dbg, 0, 256);
+    sprintf(dbg, "%s:%d", __func__, __LINE__);
+    ptcp_print_sock_skb(sk, NULL, dbg);
+    return false;
+  }
+#endif
+
 	if (unlikely(!start_ts))
 		start_ts = tcp_skb_timestamp(tcp_write_queue_head(sk));