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authorWei Wang <weiwan@google.com>2021-09-29 20:25:13 +0300
committerDavid S. Miller <davem@davemloft.net>2021-09-30 15:36:46 +0300
commit053f368412c9a7bfce2befec8c795113c8cfb0b1 (patch)
tree30f0da3c75f0c65934cf3e42cd43c3fb8d4d0488 /include
parentca057051cf25a8c198af7b73daf922ef65a3c016 (diff)
downloadlinux-053f368412c9a7bfce2befec8c795113c8cfb0b1.tar.xz
tcp: adjust rcv_ssthresh according to sk_reserved_mem
When user sets SO_RESERVE_MEM socket option, in order to utilize the reserved memory when in memory pressure state, we adjust rcv_ssthresh according to the available reserved memory for the socket, instead of using 4 * advmss always. Signed-off-by: Wei Wang <weiwan@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/net/tcp.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 32cf6c01f403..4c2898ac6569 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1421,6 +1421,17 @@ static inline int tcp_full_space(const struct sock *sk)
return tcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf));
}
+static inline void tcp_adjust_rcv_ssthresh(struct sock *sk)
+{
+ int unused_mem = sk_unused_reserved_mem(sk);
+ struct tcp_sock *tp = tcp_sk(sk);
+
+ tp->rcv_ssthresh = min(tp->rcv_ssthresh, 4U * tp->advmss);
+ if (unused_mem)
+ tp->rcv_ssthresh = max_t(u32, tp->rcv_ssthresh,
+ tcp_win_from_space(sk, unused_mem));
+}
+
void tcp_cleanup_rbuf(struct sock *sk, int copied);
/* We provision sk_rcvbuf around 200% of sk_rcvlowat.