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authorEric Dumazet <edumazet@google.com>2020-11-13 07:08:08 -0800
committerJakub Kicinski <kuba@kernel.org>2020-11-14 16:09:56 -0800
commitd3cd4924e3853aa771c3acf6f3ea3fb2cccdfadd (patch)
tree94345aae2270f7f2fcdcdcc313c31572033d800a /net/ipv4/tcp_ipv4.c
parentIPv4: RTM_GETROUTE: Add RTA_ENCAP to result (diff)
downloadlinux-dev-d3cd4924e3853aa771c3acf6f3ea3fb2cccdfadd.tar.xz
linux-dev-d3cd4924e3853aa771c3acf6f3ea3fb2cccdfadd.zip
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/ipv4/tcp_ipv4.c')
-rw-r--r--net/ipv4/tcp_ipv4.c14
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,