Currently the i40e driver enforces its own internally calculated per-VF MAC
filter limit, derived from the number of allocated VFs and available
hardware resources. This limit is not configurable by the administrator,
which makes it difficult to control how many MAC addresses each VF may
use.
This patch adds support for the new generic devlink runtime parameter
"max_mac_per_vf" which provides administrators with a way to cap the
number of MAC addresses a VF can use:
- When the parameter is set to 0 (default), the driver continues to use
its internally calculated limit.
- When set to a non-zero value, the driver applies this value as a strict
cap for VFs, overriding the internal calculation.
Important notes:
- The configured value is a theoretical maximum. Hardware limits may
still prevent additional MAC addresses from being added, even if the
parameter allows it.
- Since MAC filters are a shared hardware resource across all VFs,
setting a high value may cause resource contention and starve other
VFs.
- This change gives administrators predictable and flexible control over
VF resource allocation, while still respecting hardware limitations.
- Previous discussion about this change:
https://lore.kernel.org/netdev/20250805134042.2604897-2-dhill@redhat.comhttps://lore.kernel.org/netdev/20250823094952.182181-1-mheib@redhat.com
Signed-off-by: Mohammad Heib <mheib@redhat.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Tested-by: Rafal Romanowski <rafal.romanowski@intel.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Align devlink info versions with ice driver so change 'fw.mgmt'
version to be 2-digit version [major.minor], add 'fw.mgmt.build'
that reports mgmt firmware build number and use '"fw.psid.api'
for NVM format version instead of incorrect '"fw.psid'.
Additionally add missing i40e devlink documentation.
Fixes: 5a423552e0 ("i40e: Add handler for devlink .info_get")
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://lore.kernel.org/r/20231018123558.552453-1-ivecera@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Mohammad Heib
Ivan Vecera