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ice: add E830 HW VF mailbox message limit support

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[ Upstream commit 59f4d59b25 ]

E830 adds hardware support to prevent the VF from overflowing the PF
mailbox with VIRTCHNL messages. E830 will use the hardware feature
(ICE_F_MBX_LIMIT) instead of the software solution ice_is_malicious_vf().

To prevent a VF from overflowing the PF, the PF sets the number of
messages per VF that can be in the PF's mailbox queue
(ICE_MBX_OVERFLOW_WATERMARK). When the PF processes a message from a VF,
the PF decrements the per VF message count using the E830_MBX_VF_DEC_TRIG
register.

Signed-off-by: Paul Greenwalt <paul.greenwalt@intel.com>
Reviewed-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Tested-by: Rafal Romanowski <rafal.romanowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Stable-dep-of: 79990cf5e7 ("ice: Fix deinitializing VF in error path")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Paul Greenwalt 2024-08-20 17:26:16 -04:00 • committed by Greg Kroah-Hartman
commit dc44e67c6d
9 changed files with 96 additions and 13 deletions
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