net: dsa: sja1105: delete vlan delta save/restore logic
With the best_effort_vlan_filtering mode now gone, the driver does not have 3 operating modes anymore (VLAN-unaware, VLAN-aware and best effort), but only 2. The idea is that we will gain support for network stack I/O through a VLAN-aware bridge, using the data plane offload framework (imprecise RX, imprecise TX). So the VLAN-aware use case will be more functional. But standalone ports that are part of the same switch when some other ports are under a VLAN-aware bridge should work too. Termination on those should work through the tag_8021q RX VLAN and TX VLAN. This was not possible using the old logic, because: - in VLAN-unaware mode, only the tag_8021q VLANs were committed to hw - in VLAN-aware mode, only the bridge VLANs were committed to hw - in best-effort VLAN mode, both the tag_8021q and bridge VLANs were committed to hw The strategy for the new VLAN-aware mode is to allow the bridge and the tag_8021q VLANs to coexist in the VLAN table at the same time. [ yes, we need to make sure that the bridge cannot install a tag_8021q VLAN, but ] This means that the save/restore logic introduced by commit ec5ae610 ("net: dsa: sja1105: save/restore VLANs using a delta commit method") does not serve a purpose any longer. We can delete it and restore the old code that simply adds a VLAN to the VLAN table and calls it a day. Note that we keep the sja1105_commit_pvid() function from those days, but adapt it slightly. Ports that are under a VLAN-aware bridge use the bridge's pvid, ports that are standalone or under a VLAN-unaware bridge use the tag_8021q pvid, for local termination or VLAN-unaware forwarding. Now, when the vlan_filtering property is toggled for the bridge, the pvid of the ports beneath it is the only thing that's changing, we no longer delete some VLANs and restore others. Signed-off-by:Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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d63f8877
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