[DCCP]: More debug information for dccp_wait_for_ccid

This adds more detail in the wait_for_ccid packet scheduling loop.
In particular, it informs about (i) when delay is used and (ii) why
a packet is discarded.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/net/dccp/output.c b/net/dccp/output.c
index aa21cc4de37f..c8d843e983fc 100644
--- a/net/dccp/output.c
+++ b/net/dccp/output.c
@@ -194,6 +194,7 @@ static int dccp_wait_for_ccid(struct sock *sk, struct sk_buff *skb)
                 rc = ccid_hc_tx_send_packet(dp->dccps_hc_tx_ccid, sk, skb);
                 if (rc <= 0)
                         break;
+                dccp_pr_debug("delayed send by %d msec\n", rc);
                 delay = msecs_to_jiffies(rc);
                 sk->sk_write_pending++;
                 release_sock(sk);
@@ -255,7 +256,7 @@ void dccp_write_xmit(struct sock *sk, int block)
                                 DCCP_BUG("err=%d after ccid_hc_tx_packet_sent",
                                          err);
                 } else {
-                        dccp_pr_debug("packet discarded\n");
+                        dccp_pr_debug("packet discarded due to err=%d\n", err);
                         kfree_skb(skb);
                 }
         }