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Date:   Thu, 27 Aug 2020 16:03:33 +0100
From:   David Howells <>
Subject: [PATCH net 0/7] rxrpc, afs: Fix probing issues

Here are some fixes for rxrpc and afs to fix issues in the RTT measuring in
rxrpc and thence the Volume Location server probing in afs:

 (1) Move the serial number of a received ACK into a local variable to
     simplify the next patch.

 (2) Fix the loss of RTT samples due to extra interposed ACKs causing
     baseline information to be discarded too early.  This is a particular
     problem for afs when it sends a single very short call to probe a
     server it hasn't talked to recently.

 (3) Fix rxrpc_kernel_get_srtt() to indicate whether it actually has seen
     any valid samples or not.

 (4) Remove a field that's set/woken, but never read/waited on.

 (5) Expose the RTT and other probe information through procfs to make
     debugging of this stuff easier.

 (6) Fix VL rotation in afs to only use summary information from VL probing
     and not the probe running state (which gets clobbered when next a
     probe is issued).

 (7) Fix VL rotation to actually return the error aggregated from the probe

The patches are tagged here:


and can also be found on the following branch:

David Howells (7):
      rxrpc: Keep the ACK serial in a var in rxrpc_input_ack()
      rxrpc: Fix loss of RTT samples due to interposed ACK
      rxrpc: Make rxrpc_kernel_get_srtt() indicate validity
      afs: Remove afs_vlserver->probe.have_result
      afs: Expose information from afs_vlserver through /proc for debugging
      afs: Don't use VL probe running state to make decisions outside probe code
      afs: Fix error handling in VL server rotation

 fs/afs/fs_probe.c            |   4 +-
 fs/afs/internal.h            |  14 +++--
 fs/afs/proc.c                |   5 ++
 fs/afs/vl_list.c             |   1 +
 fs/afs/vl_probe.c            |  82 ++++++++++++++++-----------
 fs/afs/vl_rotate.c           |   7 ++-
 include/net/af_rxrpc.h       |   2 +-
 include/trace/events/rxrpc.h |  27 +++++++--
 net/rxrpc/ar-internal.h      |  13 +++--
 net/rxrpc/call_object.c      |   1 +
 net/rxrpc/input.c            | 104 ++++++++++++++++++++---------------
 net/rxrpc/output.c           |  82 ++++++++++++++++++++-------
 net/rxrpc/peer_object.c      |  16 +++++-
 net/rxrpc/rtt.c              |   3 +-
 14 files changed, 241 insertions(+), 120 deletions(-)

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