Here are a couple of patches to fix ACK handling in AF_RXRPC:

 (1) Allow RTT determination to use an ACK of any type as the response from
     which to calculate RTT, provided ack.serial matches the serial number
     of the outgoing packet.

 (2) Defer the response to a PING ACK packet (or any ACK with the
     REQUEST_ACK flag set) until after we've parsed the packet so that we
     carry up to date information if the Tx or Rx rings are advanced.

David

---
The patches can be found here also:

	http://git.kernel.org/cgit/linux/kernel/git/dhowells/linux-fs.git/log/?h=rxrpc-fixes

David Howells (2):
  rxrpc: Fix RTT determination to use any ACK as a source
  rxrpc: Defer the response to a PING ACK until we've parsed it

 include/trace/events/rxrpc.h |  2 +-
 net/rxrpc/input.c            | 61 +++++++++++++++++-------------------
 2 files changed, 30 insertions(+), 33 deletions(-)

Hello:

This series was applied to netdev/net.git (main)
by David S. Miller <davem@davemloft.net>:

On Thu, 16 Nov 2023 13:12:57 +0000 you wrote:
> Here are a couple of patches to fix ACK handling in AF_RXRPC:
> 
>  (1) Allow RTT determination to use an ACK of any type as the response from
>      which to calculate RTT, provided ack.serial matches the serial number
>      of the outgoing packet.
> 
>  (2) Defer the response to a PING ACK packet (or any ACK with the
>      REQUEST_ACK flag set) until after we've parsed the packet so that we
>      carry up to date information if the Tx or Rx rings are advanced.
> 
> [...]

Here is the summary with links:
  - [net,1/2] rxrpc: Fix RTT determination to use any ACK as a source
    https://git.kernel.org/netdev/net/c/3798680f2fbb
  - [net,2/2] rxrpc: Defer the response to a PING ACK until we've parsed it
    https://git.kernel.org/netdev/net/c/1a01319feef7

You are awesome, thank you!
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