xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[TCP]: Add pluggable congestion control algorithm infrastructure.

Browse Source 
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>
This commit is contained in:
Stephen Hemminger
2005-06-23 12:19:55 -07:00
committed by David S. Miller
parent a8ad86f2dc
commit 317a76f9a4
13 changed files with 399 additions and 999 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
include/linux/sysctl.h
View File

@@ -333,21 +333,14 @@ enum
NET_TCP_FRTO=92,
NET_TCP_LOW_LATENCY=93,
NET_IPV4_IPFRAG_SECRET_INTERVAL=94,
NET_TCP_WESTWOOD=95,
NET_IPV4_IGMP_MAX_MSF=96,
NET_TCP_NO_METRICS_SAVE=97,
NET_TCP_VEGAS=98,
NET_TCP_VEGAS_ALPHA=99,
NET_TCP_VEGAS_BETA=100,
NET_TCP_VEGAS_GAMMA=101,
NET_TCP_BIC=102,
NET_TCP_BIC_FAST_CONVERGENCE=103,
NET_TCP_BIC_LOW_WINDOW=104,
NET_TCP_DEFAULT_WIN_SCALE=105,
NET_TCP_MODERATE_RCVBUF=106,
NET_TCP_TSO_WIN_DIVISOR=107,
NET_TCP_BIC_BETA=108,
NET_IPV4_ICMP_ERRORS_USE_INBOUND_IFADDR=109,
NET_TCP_CONG_CONTROL=110,
};
enum {

49
include/linux/tcp.h
View File

@@ -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 */