mlxsw: spectrum_acl_tcam: Fix race in region ID allocation

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Region identifiers can be allocated both when user space tries to insert
a new tc filter and when filters are migrated from one region to another
as part of the rehash delayed work.

There is no lock protecting the bitmap from which these identifiers are
allocated from, which is racy and leads to bad parameter errors from the
device's firmware.

Fix by converting the bitmap to IDA which handles its own locking. For
consistency, do the same for the group identifiers that are part of the
same structure.

Fixes: 2bffc5322f ("mlxsw: spectrum_acl: Don't take mutex in mlxsw_sp_acl_tcam_vregion_rehash_work()")
Reported-by: Amit Cohen <amcohen@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Tested-by: Alexander Zubkov <green@qrator.net>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/ce494b7940cadfe84f3e18da7785b51ef5f776e3.1713797103.git.petrm@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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This commit is contained in:

Ido Schimmel 2024-04-22 17:25:54 +02:00 • committed by Jakub Kicinski

parent 5ea7b72d4f

commit 627f9c1bb8

2 changed files with 30 additions and 36 deletions

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61

drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c

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5

drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.h

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