netdev - [Intel-wired-lan] [PATCH net 0/5] idpf: replace Tx flow scheduling buffer ring with buffer pool

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250625161156.338777-1-joshua.a.hay@intel.com>
Date: Wed, 25 Jun 2025 09:11:51 -0700
From: Joshua Hay <joshua.a.hay@...el.com>
To: intel-wired-lan@...ts.osuosl.org
Cc: netdev@...r.kernel.org,
	Joshua Hay <joshua.a.hay@...el.com>
Subject: [Intel-wired-lan] [PATCH net 0/5] idpf: replace Tx flow scheduling buffer ring with buffer pool

This series fixes a stability issue in the flow scheduling Tx send/clean
path that results in a Tx timeout.                                       

The existing guardrails in the Tx path were not sufficient to prevent
the driver from reusing completion tags that were still in flight (held
by the HW).  This collision would cause the driver to erroneously clean
the wrong packet thus leaving the descriptor ring in a bad state.        

The main point of this refactor is replace the flow scheduling buffer
ring with a large pool/array of buffers.  The completion tag then simply
is the index into this array.  The driver tracks the free tags and pulls
the next free one from a refillq.  The cleaning routines simply use the
completion tag from the completion descriptor to index into the array to
quickly find the buffers to clean.                                       

All of the code to support the refactor is added first to ensure traffic
still passes with each patch.  The final patch then removes all of the
obsolete stashing code.

Joshua Hay (5):
  idpf: add support for Tx refillqs in flow scheduling mode
  idpf: improve when to set RE bit logic
  idpf: replace flow scheduling buffer ring with buffer pool
  idpf: stop Tx if there are insufficient buffer resources
  idpf: remove obsolete stashing code

 .../ethernet/intel/idpf/idpf_singleq_txrx.c   |   6 +-
 drivers/net/ethernet/intel/idpf/idpf_txrx.c   | 626 ++++++------------
 drivers/net/ethernet/intel/idpf/idpf_txrx.h   |  76 +--
 3 files changed, 239 insertions(+), 469 deletions(-)

-- 
2.39.2