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authorStephen Hemminger <shemminger@osdl.org>2005-06-23 12:19:55 -0700
committerDavid S. Miller <davem@davemloft.net>2005-06-23 12:19:55 -0700
commit317a76f9a44b437d6301718f4e5d08bd93f98da7 (patch)
treecaeba9839dee264f59b035b81c3d13d6c61b638e /include/linux/tcp.h
parenta8ad86f2dc46356f87be1327dabc18bdbda32f50 (diff)
downloadop-kernel-dev-317a76f9a44b437d6301718f4e5d08bd93f98da7.zip
op-kernel-dev-317a76f9a44b437d6301718f4e5d08bd93f98da7.tar.gz
[TCP]: Add pluggable congestion control algorithm infrastructure.
Allow TCP to have multiple pluggable congestion control algorithms. Algorithms are defined by a set of operations and can be built in or modules. The legacy "new RENO" algorithm is used as a starting point and fallback. Signed-off-by: Stephen Hemminger <shemminger@osdl.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/tcp.h')
-rw-r--r--include/linux/tcp.h49
1 files changed, 10 insertions, 39 deletions
diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 97a7c9e..3ea75dd 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -203,13 +203,6 @@ struct tcp_sack_block {
__u32 end_seq;
};
-enum tcp_congestion_algo {
- TCP_RENO=0,
- TCP_VEGAS,
- TCP_WESTWOOD,
- TCP_BIC,
-};
-
struct tcp_options_received {
/* PAWS/RTTM data */
long ts_recent_stamp;/* Time we stored ts_recent (for aging) */
@@ -305,7 +298,7 @@ struct tcp_sock {
__u8 reordering; /* Packet reordering metric. */
__u8 frto_counter; /* Number of new acks after RTO */
- __u8 adv_cong; /* Using Vegas, Westwood, or BIC */
+ __u8 unused;
__u8 defer_accept; /* User waits for some data after accept() */
/* RTT measurement */
@@ -401,37 +394,10 @@ struct tcp_sock {
__u32 time;
} rcvq_space;
-/* TCP Westwood structure */
- struct {
- __u32 bw_ns_est; /* first bandwidth estimation..not too smoothed 8) */
- __u32 bw_est; /* bandwidth estimate */
- __u32 rtt_win_sx; /* here starts a new evaluation... */
- __u32 bk;
- __u32 snd_una; /* used for evaluating the number of acked bytes */
- __u32 cumul_ack;
- __u32 accounted;
- __u32 rtt;
- __u32 rtt_min; /* minimum observed RTT */
- } westwood;
-
-/* Vegas variables */
- struct {
- __u32 beg_snd_nxt; /* right edge during last RTT */
- __u32 beg_snd_una; /* left edge during last RTT */
- __u32 beg_snd_cwnd; /* saves the size of the cwnd */
- __u8 doing_vegas_now;/* if true, do vegas for this RTT */
- __u16 cntRTT; /* # of RTTs measured within last RTT */
- __u32 minRTT; /* min of RTTs measured within last RTT (in usec) */
- __u32 baseRTT; /* the min of all Vegas RTT measurements seen (in usec) */
- } vegas;
-
- /* BI TCP Parameters */
- struct {
- __u32 cnt; /* increase cwnd by 1 after this number of ACKs */
- __u32 last_max_cwnd; /* last maximium snd_cwnd */
- __u32 last_cwnd; /* the last snd_cwnd */
- __u32 last_stamp; /* time when updated last_cwnd */
- } bictcp;
+ /* Pluggable TCP congestion control hook */
+ struct tcp_congestion_ops *ca_ops;
+ u32 ca_priv[16];
+#define TCP_CA_PRIV_SIZE (16*sizeof(u32))
};
static inline struct tcp_sock *tcp_sk(const struct sock *sk)
@@ -439,6 +405,11 @@ static inline struct tcp_sock *tcp_sk(const struct sock *sk)
return (struct tcp_sock *)sk;
}
+static inline void *tcp_ca(const struct tcp_sock *tp)
+{
+ return (void *) tp->ca_priv;
+}
+
#endif
#endif /* _LINUX_TCP_H */
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