Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6

[pandora-kernel.git] / net / dccp / ccid.h

diff --git a/net/dccp/ccid.h b/net/dccp/ccid.h
index 117fb09..75c3582 100644 (file)
--- a/net/dccp/ccid.h
+++ b/net/dccp/ccid.h
@@ -134,13 +134,41 @@ static inline int ccid_get_current_tx_ccid(struct dccp_sock *dp)
 extern void ccid_hc_rx_delete(struct ccid *ccid, struct sock *sk);
 extern void ccid_hc_tx_delete(struct ccid *ccid, struct sock *sk);
 
+/*
+ * Congestion control of queued data packets via CCID decision.
+ *
+ * The TX CCID performs its congestion-control by indicating whether and when a
+ * queued packet may be sent, using the return code of ccid_hc_tx_send_packet().
+ * The following modes are supported via the symbolic constants below:
+ * - timer-based pacing    (CCID returns a delay value in milliseconds);
+ * - autonomous dequeueing (CCID internally schedules dccps_xmitlet).
+ */
+
+enum ccid_dequeueing_decision {
+       CCID_PACKET_SEND_AT_ONCE =       0x00000,  /* "green light": no delay */
+       CCID_PACKET_DELAY_MAX =          0x0FFFF,  /* maximum delay in msecs  */
+       CCID_PACKET_DELAY =              0x10000,  /* CCID msec-delay mode */
+       CCID_PACKET_WILL_DEQUEUE_LATER = 0x20000,  /* CCID autonomous mode */
+       CCID_PACKET_ERR =                0xF0000,  /* error condition */
+};
+
+static inline int ccid_packet_dequeue_eval(const int return_code)
+{
+       if (return_code < 0)
+               return CCID_PACKET_ERR;
+       if (return_code == 0)
+               return CCID_PACKET_SEND_AT_ONCE;
+       if (return_code <= CCID_PACKET_DELAY_MAX)
+               return CCID_PACKET_DELAY;
+       return return_code;
+}
+
 static inline int ccid_hc_tx_send_packet(struct ccid *ccid, struct sock *sk,
                                         struct sk_buff *skb)
 {
-       int rc = 0;
        if (ccid->ccid_ops->ccid_hc_tx_send_packet != NULL)
-               rc = ccid->ccid_ops->ccid_hc_tx_send_packet(sk, skb);
-       return rc;
+               return ccid->ccid_ops->ccid_hc_tx_send_packet(sk, skb);
+       return CCID_PACKET_SEND_AT_ONCE;
 }
 
 static inline void ccid_hc_tx_packet_sent(struct ccid *ccid, struct sock *sk,