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Amit Cohen a991cd35c4 selftests: mlxsw: qos_pfc: Adjust the test to support 8 lanes ... [ Upstream commit b34f4de6d3 ] 'qos_pfc' test checks PFC behavior. The idea is to limit the traffic using a shaper somewhere in the flow of the packets. In this area, the buffer is smaller than the buffer at the beginning of the flow, so it fills up until there is no more space left. The test configures there PFC which is supposed to notice that the headroom is filling up and send PFC Xoff to indicate the transmitter to stop sending traffic for the priorities sharing this PG. The Xon/Xoff threshold is auto-configured and always equal to 2*(MTU rounded up to cell size). Even after sending the PFC Xoff packet, traffic will keep arriving until the transmitter receives and processes the PFC packet. This amount of traffic is known as the PFC delay allowance. Currently the buffer for the delay traffic is configured as 100KB. The MTU in the test is 10KB, therefore the threshold for Xoff is about 20KB. This allows 80KB extra to be stored in this buffer. 8-lane ports use two buffers among which the configured buffer is split, the Xoff threshold then applies to each buffer in parallel. The test does not take into account the behavior of 8-lane ports, when the ports are configured to 400Gbps with 8 lanes or 800Gbps with 8 lanes, packets are dropped and the test fails. Check if the relevant ports use 8 lanes, in such case double the size of the buffer, as the headroom is split half-half. Cc: Shuah Khan <shuah@kernel.org> Fixes: bfa804784e ("selftests: mlxsw: Add a PFC test") Signed-off-by: Amit Cohen <amcohen@nvidia.com> Reviewed-by: Ido Schimmel <idosch@nvidia.com> Signed-off-by: Petr Machata <petrm@nvidia.com> Acked-by: Paolo Abeni <pabeni@redhat.com> Link: https://lore.kernel.org/r/23ff11b7dff031eb04a41c0f5254a2b636cd8ebb.1705502064.git.petrm@nvidia.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2024-01-25 15:36:00 -08:00
..
crypto/chacha20-s390	tools/testing/crypto: Use vzalloc instead of vmalloc+memset	2022-07-05 14:46:36 +02:00
cxl	cxl: Add cxl_num_decoders_committed() usage to cxl_test	2024-01-10 17:17:02 +01:00
fault-injection	docs: fault-injection: convert docs to ReST and rename to *.rst	2019-06-14 14:21:07 -06:00
ktest	ktest: Restore stty setting at first in dodie	2023-02-20 11:52:27 -05:00
kunit	sound updates for 6.6-rc1	2023-08-30 13:45:05 -07:00
memblock	memblock tests: fix warning ‘struct seq_file’ declared inside parameter list	2023-09-14 10:51:28 +03:00
nvdimm	tools/testing/nvdimm: Drop empty platform remove function	2023-06-07 13:30:21 -07:00
radix-tree	maple_tree: do not preallocate nodes for slot stores	2024-01-05 15:19:43 +01:00
scatterlist	tools/testing/scatterlist: add missing defines	2022-01-30 09:56:58 +02:00
selftests	selftests: mlxsw: qos_pfc: Adjust the test to support 8 lanes	2024-01-25 15:36:00 -08:00
vsock	vsock/test: fix SEQPACKET message bounds test	2023-12-03 07:33:05 +01:00