diff options
| author | Eric Dumazet <edumazet@google.com> | 2020-11-13 07:08:08 -0800 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2020-11-14 16:09:56 -0800 |
| commit | d3cd4924e3853aa771c3acf6f3ea3fb2cccdfadd (patch) | |
| tree | 94345aae2270f7f2fcdcdcc313c31572033d800a /net | |
| parent | ae8cb93286e50ece1e45674661cbefcafe8b811c (diff) | |
tcp: uninline tcp_stream_memory_free()
Both IPv4 and IPv6 needs it via a function pointer.
Following patch will avoid the indirect call.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/tcp_ipv4.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 7352c097ae48..c2d5132c523c 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -2740,6 +2740,20 @@ void tcp4_proc_exit(void) } #endif /* CONFIG_PROC_FS */ +/* @wake is one when sk_stream_write_space() calls us. + * This sends EPOLLOUT only if notsent_bytes is half the limit. + * This mimics the strategy used in sock_def_write_space(). + */ +bool tcp_stream_memory_free(const struct sock *sk, int wake) +{ + const struct tcp_sock *tp = tcp_sk(sk); + u32 notsent_bytes = READ_ONCE(tp->write_seq) - + READ_ONCE(tp->snd_nxt); + + return (notsent_bytes << wake) < tcp_notsent_lowat(tp); +} +EXPORT_SYMBOL(tcp_stream_memory_free); + struct proto tcp_prot = { .name = "TCP", .owner = THIS_MODULE, |