diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/tcp.h | 4 | ||||
| -rw-r--r-- | include/net/netns/ipv4.h | 2 | ||||
| -rw-r--r-- | include/net/tcp.h | 24 |
3 files changed, 24 insertions, 6 deletions
diff --git a/include/linux/tcp.h b/include/linux/tcp.h index b4c08ac86983..fbcb0ce13171 100644 --- a/include/linux/tcp.h +++ b/include/linux/tcp.h @@ -172,6 +172,8 @@ static inline struct tcp_request_sock *tcp_rsk(const struct request_sock *req) return (struct tcp_request_sock *)req; } +#define TCP_RMEM_TO_WIN_SCALE 8 + struct tcp_sock { /* inet_connection_sock has to be the first member of tcp_sock */ struct inet_connection_sock inet_conn; @@ -238,7 +240,7 @@ struct tcp_sock { u32 window_clamp; /* Maximal window to advertise */ u32 rcv_ssthresh; /* Current window clamp */ - + u8 scaling_ratio; /* see tcp_win_from_space() */ /* Information of the most recently (s)acked skb */ struct tcp_rack { u64 mstamp; /* (Re)sent time of the skb */ diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h index f00374718159..7a41c4791536 100644 --- a/include/net/netns/ipv4.h +++ b/include/net/netns/ipv4.h @@ -152,7 +152,7 @@ struct netns_ipv4 { u8 sysctl_tcp_abort_on_overflow; u8 sysctl_tcp_fack; /* obsolete */ int sysctl_tcp_max_reordering; - int sysctl_tcp_adv_win_scale; + int sysctl_tcp_adv_win_scale; /* obsolete */ u8 sysctl_tcp_dsack; u8 sysctl_tcp_app_win; u8 sysctl_tcp_frto; diff --git a/include/net/tcp.h b/include/net/tcp.h index 226bce6d1e8c..2104a71c75ba 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -1434,11 +1434,27 @@ void tcp_select_initial_window(const struct sock *sk, int __space, static inline int tcp_win_from_space(const struct sock *sk, int space) { - int tcp_adv_win_scale = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_adv_win_scale); + s64 scaled_space = (s64)space * tcp_sk(sk)->scaling_ratio; - return tcp_adv_win_scale <= 0 ? - (space>>(-tcp_adv_win_scale)) : - space - (space>>tcp_adv_win_scale); + return scaled_space >> TCP_RMEM_TO_WIN_SCALE; +} + +/* inverse of tcp_win_from_space() */ +static inline int tcp_space_from_win(const struct sock *sk, int win) +{ + u64 val = (u64)win << TCP_RMEM_TO_WIN_SCALE; + + do_div(val, tcp_sk(sk)->scaling_ratio); + return val; +} + +static inline void tcp_scaling_ratio_init(struct sock *sk) +{ + /* Assume a conservative default of 1200 bytes of payload per 4K page. + * This may be adjusted later in tcp_measure_rcv_mss(). + */ + tcp_sk(sk)->scaling_ratio = (1200 << TCP_RMEM_TO_WIN_SCALE) / + SKB_TRUESIZE(4096); } /* Note: caller must be prepared to deal with negative returns */ |