linux-kernel - [PATCH net-next 0/3] net: tcp: support probing OOM

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Message-Id: <20230727125125.1194376-1-imagedong@tencent.com>
Date:   Thu, 27 Jul 2023 20:51:22 +0800
From:   menglong8.dong@...il.com
To:     edumazet@...gle.com
Cc:     davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
        dsahern@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Menglong Dong <imagedong@...cent.com>
Subject: [PATCH net-next 0/3] net: tcp: support probing OOM

From: Menglong Dong <imagedong@...cent.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(-)

-- 
2.40.1