From: Menglong Dong <[email protected]>
In this series, we make some small changes to make the tcp retransmission
become zero-window probes if the receiver drops the skb because of memory
pressure.
In the 1st patch, we reply a zero-window ACK if the skb is dropped
because out of memory, instead of dropping the skb silently.
In the 2nd patch, we allow a zero-window ACK to update the window.
In the 3rd patch, we check the timeout of a probing socket with
'(u32)icsk->icsk_timeout', instead of 'tcp_jiffies32'. This is more like
a bugfix.
After these changes, the tcp can probe the OOM of the receiver forever.
Menglong Dong (3):
net: tcp: send zero-window ACK when no memory
net: tcp: allow zero-window ACK update the window
net: tcp: check timeout by icsk->icsk_timeout in
tcp_retransmit_timer()
include/net/inet_connection_sock.h | 3 ++-
net/ipv4/tcp_input.c | 6 +++---
net/ipv4/tcp_output.c | 14 +++++++++++---
net/ipv4/tcp_timer.c | 6 +++++-
4 files changed, 21 insertions(+), 8 deletions(-)
--
2.40.1