diff options
| author | Mohammad Heib <mheib@redhat.com> | 2025-10-25 16:08:59 +0300 |
|---|---|---|
| committer | Tony Nguyen <anthony.l.nguyen@intel.com> | 2025-11-06 12:57:31 -0800 |
| commit | 2c031d4c772f3a9191d04d57a3403ad6a56375c7 (patch) | |
| tree | 95daa66fdab88655323375500b94585a8f5cd2b1 /drivers/net/ethernet/intel/i40e/i40e.h | |
| parent | 9352d40c8bcd2ef29366d2c38b163c0b115039ed (diff) | |
i40e: support generic devlink param "max_mac_per_vf"
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.com
https://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>
Diffstat (limited to 'drivers/net/ethernet/intel/i40e/i40e.h')
| -rw-r--r-- | drivers/net/ethernet/intel/i40e/i40e.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h index 801a57a925da..d2d03db2acec 100644 --- a/drivers/net/ethernet/intel/i40e/i40e.h +++ b/drivers/net/ethernet/intel/i40e/i40e.h @@ -574,6 +574,10 @@ struct i40e_pf { struct i40e_vf *vf; int num_alloc_vfs; /* actual number of VFs allocated */ u32 vf_aq_requests; + /* If set to non-zero, the device uses this value + * as maximum number of MAC filters per VF. + */ + u32 max_mac_per_vf; u32 arq_overflows; /* Not fatal, possibly indicative of problems */ struct ratelimit_state mdd_message_rate_limit; /* DCBx/DCBNL capability for PF that indicates |