[TCP]: Congestion control API update.

Do some simple changes to make congestion control API faster/cleaner.
* use ktime_t rather than timeval
* merge rtt sampling into existing ack callback
  this means one indirect call versus two per ack.
* use flags bits to store options/settings

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 10 insertions, 4 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 50f6f6a094cf..2694cb3ca763 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1569,6 +1569,11 @@ static inline void __net_timestamp(struct sk_buff *skb)
         skb->tstamp = ktime_get_real();
 }
 
+static inline ktime_t net_timedelta(ktime_t t)
+{
+        return ktime_sub(ktime_get_real(), t);
+}
+
 
 extern __sum16 __skb_checksum_complete_head(struct sk_buff *skb, int len);
 extern __sum16 __skb_checksum_complete(struct sk_buff *skb);
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 43910fe3c448..a385797f160a 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -629,9 +629,12 @@ enum tcp_ca_event {
 #define TCP_CA_MAX      128
 #define TCP_CA_BUF_MAX  (TCP_CA_NAME_MAX*TCP_CA_MAX)
 
+#define TCP_CONG_NON_RESTRICTED 0x1
+#define TCP_CONG_RTT_STAMP      0x2
+
 struct tcp_congestion_ops {
         struct list_head        list;
-        int     non_restricted;
+        unsigned long flags;
 
         /* initialize private data (optional) */
         void (*init)(struct sock *sk);
@@ -645,8 +648,6 @@ struct tcp_congestion_ops {
         /* do new cwnd calculation (required) */
         void (*cong_avoid)(struct sock *sk, u32 ack,
                            u32 rtt, u32 in_flight, int good_ack);
-        /* round trip time sample per acked packet (optional) */
-        void (*rtt_sample)(struct sock *sk, u32 usrtt);
         /* call before changing ca_state (optional) */
         void (*set_state)(struct sock *sk, u8 new_state);
         /* call when cwnd event occurs (optional) */
@@ -654,7 +655,7 @@ struct tcp_congestion_ops {
         /* new value of cwnd after loss (optional) */
         u32  (*undo_cwnd)(struct sock *sk);
         /* hook for packet ack accounting (optional) */
-        void (*pkts_acked)(struct sock *sk, u32 num_acked);
+        void (*pkts_acked)(struct sock *sk, u32 num_acked, ktime_t last);
         /* get info for inet_diag (optional) */
         void (*get_info)(struct sock *sk, u32 ext, struct sk_buff *skb);