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tcp: define initial scaling factor value as a macro

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[ Upstream commit 849ee75a38b297187c760bb1d23d8f2a7b1fc73e ]

So that other users could access it. Notably MPTCP will use
it in the next patch.

No functional change intended.

Acked-by: Matthieu Baerts <matttbe@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <martineau@kernel.org>
Link: https://lore.kernel.org/r/20231023-send-net-next-20231023-2-v1-4-9dc60939d371@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: 697a6c8cec03 ("tcp: increase the default TCP scaling ratio")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Paolo Abeni 2023-10-23 13:44:37 -07:00 committed by Greg Kroah-Hartman
parent a7fba17a05
commit ca19418abc
1 changed files with 7 additions and 5 deletions
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12
include/net/tcp.h
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@ -1460,13 +1460,15 @@ static inline int tcp_space_from_win(const struct sock *sk, int win)
return __tcp_space_from_win(tcp_sk(sk)->scaling_ratio, win);
}
/* Assume a conservative default of 1200 bytes of payload per 4K page.
* This may be adjusted later in tcp_measure_rcv_mss().
*/
#define TCP_DEFAULT_SCALING_RATIO ((1200 << TCP_RMEM_TO_WIN_SCALE) / \
SKB_TRUESIZE(4096))
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);
tcp_sk(sk)->scaling_ratio = TCP_DEFAULT_SCALING_RATIO;
}
/* Note: caller must be prepared to deal with negative returns */