netdev - [PATCH bpf-next 0/6] Enhancing selftests/xsk Framework: Maximum and Minimum Ring Configurations

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Date: Fri, 15 Mar 2024 14:07:20 +0000
From: Tushar Vyavahare <tushar.vyavahare@...el.com>
To: bpf@...r.kernel.org
Cc: netdev@...r.kernel.org,
	bjorn@...nel.org,
	magnus.karlsson@...el.com,
	maciej.fijalkowski@...el.com,
	jonathan.lemon@...il.com,
	davem@...emloft.net,
	kuba@...nel.org,
	pabeni@...hat.com,
	ast@...nel.org,
	daniel@...earbox.net,
	tirthendu.sarkar@...el.com,
	tushar.vyavahare@...el.com
Subject: [PATCH bpf-next 0/6] Enhancing selftests/xsk Framework: Maximum and Minimum Ring Configurations

Please find enclosed a patch set that introduces enhancements and new test
cases to the selftests/xsk framework. These test the robustness and
reliability of AF_XDP across both minimal and maximal ring size
configurations.

While running these tests, a bug [1] was identified when the batch size is
roughly the same as the NIC ring size. This has now been addressed by
Maciej's fix.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=913eda2b08cc49d31f382579e2be34c2709eb789

Patch Summary:

1: Adds the definition of ethtool_ringparam to the UAPI header, a
   necessary step for the subsequent patches to run tests with various
   ring sizes.

2: Modifies the BATCH_SIZE from a constant to a variable, batch_size, to
   support dynamic modification at runtime for testing different hardware
   ring sizes.

3: Implements a function, get_hw_ring_size, to retrieve the current
   maximum interface size and store this information in the hw_ring
   structure.

4: Implements a new function, set_hw_ring_size, which allows for the
   dynamic configuration of the ring size within an interface.

5: Adds a new test case that puts the AF_XDP driver under stress by
   configuring minimal hardware and software ring sizes, verifying its
   functionality under constrained conditions.

6: Enhances the framework by adding a new test case that evaluates the
   maximum ring sizes for AF_XDP, ensuring its reliability under maximum
   ring utilization.

Testing Strategy:

Check the system in extreme scenarios, such as maximum and minimum
configurations. This helps identify and fix any bugs that may occur.

Tushar Vyavahare (6):
  tools/include: add ethtool_ringparam definition to UAPI header
  selftests/xsk: make batch size variable
  selftests/xsk: implement get_hw_ring_size function to retrieve current
    and max interface size
  selftests/xsk: implement set_hw_ring_size function to configure
    interface ring size
  selftests/xsk: test AF_XDP functionality under minimal ring
    configurations
  selftests/xsk: enhance framework with a new test case for AF_XDP under
    max ring sizes

Signed-off-by: Tushar Vyavahare <tushar.vyavahare@...el.com>

---
 tools/include/uapi/linux/ethtool.h       |  41 ++++++
 tools/testing/selftests/bpf/xskxceiver.c | 155 +++++++++++++++++++++--
 tools/testing/selftests/bpf/xskxceiver.h |  14 +-
 3 files changed, 200 insertions(+), 10 deletions(-)

-- 
2.34.1