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authorEric Dumazet <edumazet@google.com>2020-05-12 06:54:30 -0700
committerDavid S. Miller <davem@davemloft.net>2020-05-12 12:49:47 -0700
commit24adbc1676af4e134e709ddc7f34cf2adc2131e4 (patch)
treeab86c8315f4652959c283cb29739dfeb437da15a /include/net
parent92db978f0d686468e527d49268e7c7e8d97d334b (diff)
tcp: fix SO_RCVLOWAT hangs with fat skbs
We autotune rcvbuf whenever SO_RCVLOWAT is set to account for 100% overhead in tcp_set_rcvlowat() This works well when skb->len/skb->truesize ratio is bigger than 0.5 But if we receive packets with small MSS, we can end up in a situation where not enough bytes are available in the receive queue to satisfy RCVLOWAT setting. As our sk_rcvbuf limit is hit, we send zero windows in ACK packets, preventing remote peer from sending more data. Even autotuning does not help, because it only triggers at the time user process drains the queue. If no EPOLLIN is generated, this can not happen. Note poll() has a similar issue, after commit c7004482e8dc ("tcp: Respect SO_RCVLOWAT in tcp_poll().") Fixes: 03f45c883c6f ("tcp: avoid extra wakeups for SO_RCVLOWAT users") Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Soheil Hassas Yeganeh <soheil@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
-rw-r--r--include/net/tcp.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 64f84683feae..6f8e60c6fbc7 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1420,6 +1420,19 @@ static inline int tcp_full_space(const struct sock *sk)
return tcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf));
}
+/* We provision sk_rcvbuf around 200% of sk_rcvlowat.
+ * If 87.5 % (7/8) of the space has been consumed, we want to override
+ * SO_RCVLOWAT constraint, since we are receiving skbs with too small
+ * len/truesize ratio.
+ */
+static inline bool tcp_rmem_pressure(const struct sock *sk)
+{
+ int rcvbuf = READ_ONCE(sk->sk_rcvbuf);
+ int threshold = rcvbuf - (rcvbuf >> 3);
+
+ return atomic_read(&sk->sk_rmem_alloc) > threshold;
+}
+
extern void tcp_openreq_init_rwin(struct request_sock *req,
const struct sock *sk_listener,
const struct dst_entry *dst);