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| author | Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> | 2009-03-14 14:23:05 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-03-15 20:09:54 -0700 |
| commit | 0c54b85f2828128274f319a1eb3ce7f604fe2a53 (patch) | |
| tree | 8ff84b9aa9cd4775f244c2421e11adfbd206a7bf /include/net/tcp.h | |
| parent | 72211e90501f954f586481c25521c3724cda3cc7 (diff) | |
| download | blackbird-op-linux-0c54b85f2828128274f319a1eb3ce7f604fe2a53.tar.gz blackbird-op-linux-0c54b85f2828128274f319a1eb3ce7f604fe2a53.zip | |
tcp: simplify tcp_current_mss
There's very little need for most of the callsites to get
tp->xmit_goal_size updated. That will cost us divide as is,
so slice the function in two. Also, the only users of the
tp->xmit_goal_size are directly behind tcp_current_mss(),
so there's no need to store that variable into tcp_sock
at all! The drop of xmit_goal_size currently leaves 16-bit
hole and some reorganization would again be necessary to
change that (but I'm aiming to fill that hole with u16
xmit_goal_size_segs to cache the results of the remaining
divide to get that tso on regression).
Bring xmit_goal_size parts into tcp.c
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Cc: Evgeniy Polyakov <zbr@ioremap.net>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/tcp.h')
| -rw-r--r-- | include/net/tcp.h | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index 255ca35bea05..e54c76d75495 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -481,7 +481,16 @@ static inline void tcp_clear_xmit_timers(struct sock *sk) } extern unsigned int tcp_sync_mss(struct sock *sk, u32 pmtu); -extern unsigned int tcp_current_mss(struct sock *sk, int large); +extern unsigned int tcp_current_mss(struct sock *sk); + +/* Bound MSS / TSO packet size with the half of the window */ +static inline int tcp_bound_to_half_wnd(struct tcp_sock *tp, int pktsize) +{ + if (tp->max_window && pktsize > (tp->max_window >> 1)) + return max(tp->max_window >> 1, 68U - tp->tcp_header_len); + else + return pktsize; +} /* tcp.c */ extern void tcp_get_info(struct sock *, struct tcp_info *); @@ -822,7 +831,7 @@ static inline void tcp_push_pending_frames(struct sock *sk) { struct tcp_sock *tp = tcp_sk(sk); - __tcp_push_pending_frames(sk, tcp_current_mss(sk, 1), tp->nonagle); + __tcp_push_pending_frames(sk, tcp_current_mss(sk), tp->nonagle); } static inline void tcp_init_wl(struct tcp_sock *tp, u32 seq) |
