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When adding a VLAN sub-interface on a DSA slave port, the 8021q core checks NETIF_F_HW_VLAN_CTAG_FILTER and, if the netdev is capable of filtering, calls .ndo_vlan_rx_add_vid or .ndo_vlan_rx_kill_vid to configure the VLAN offloading. DSA sets this up counter-intuitively: it always advertises this netdev feature, but the underlying driver may not actually support VLAN table manipulation. In that case, the DSA core is forced to ignore the error, because not being able to offload the VLAN is still fine - and should result in the creation of a non-accelerated VLAN sub-interface. Change this so that the netdev feature is only advertised for switch drivers that support VLAN manipulation, instead of checking for -EOPNOTSUPP at runtime. Suggested-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Vladimir Oltean <olteanv@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.