.. SPDX-License-Identifier: GPL-2.0
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=======================
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sja1105 devlink support
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=======================
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This document describes the devlink features implemented
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by the ``sja1105`` device driver.
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Parameters
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==========
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.. list-table:: Driver-specific parameters implemented
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:widths: 5 5 5 85
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* - Name
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- Type
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- Mode
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- Description
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* - ``best_effort_vlan_filtering``
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- Boolean
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- runtime
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- Allow plain ETH_P_8021Q headers to be used as DSA tags.
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Benefits:
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- Can terminate untagged traffic over switch net
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devices even when enslaved to a bridge with
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vlan_filtering=1.
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- Can terminate VLAN-tagged traffic over switch net
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devices even when enslaved to a bridge with
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vlan_filtering=1, with some constraints (no more than
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7 non-pvid VLANs per user port).
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- Can do QoS based on VLAN PCP and VLAN membership
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admission control for autonomously forwarded frames
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(regardless of whether they can be terminated on the
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CPU or not).
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Drawbacks:
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- User cannot use VLANs in range 1024-3071. If the
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switch receives frames with such VIDs, it will
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misinterpret them as DSA tags.
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- Switch uses Shared VLAN Learning (FDB lookup uses
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only DMAC as key).
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- When VLANs span cross-chip topologies, the total
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number of permitted VLANs may be less than 7 per
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port, due to a maximum number of 32 VLAN retagging
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rules per switch.
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