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[net-next,0/3] net: tcp: support probing OOM

Message ID 20230727125125.1194376-1-imagedong@tencent.com (mailing list archive)
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Series net: tcp: support probing OOM | expand

Message

Menglong Dong July 27, 2023, 12:51 p.m. UTC 
From: Menglong Dong <imagedong@tencent.com>

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(-)