mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
synced 2025-01-17 05:45:20 +00:00
47c2c0c231
On SJA1105P/Q/R/S and SJA1110, the L2 Lookup Table entries contain a
maskable "inner/outer tag" bit which means:
- when set to 1: match single-outer and double tagged frames
- when set to 0: match untagged and single-inner tagged frames
- when masked off: match all frames regardless of the type of tag
This driver does not make any meaningful distinction between inner tags
(matches on TPID) and outer tags (matches on TPID2). In fact, all VLAN
table entries are installed as SJA1110_VLAN_D_TAG, which means that they
match on both inner and outer tags.
So it does not make sense that we install FDB entries with the IOTAG bit
set to 1.
In VLAN-unaware mode, we set both TPID and TPID2 to 0xdadb, so the
switch will see frames as outer-tagged or double-tagged (never inner).
So the FDB entries will match if IOTAG is set to 1.
In VLAN-aware mode, we set TPID to 0x8100 and TPID2 to 0x88a8. So the
switch will see untagged and 802.1Q-tagged packets as inner-tagged, and
802.1ad-tagged packets as outer-tagged. So untagged and 802.1Q-tagged
packets will not match FDB entries if IOTAG is set to 1, but 802.1ad
tagged packets will. Strange.
To fix this, simply mask off the IOTAG bit from FDB entries, and make
them match regardless of whether the VLAN tag is inner or outer.
Fixes: 1da73821343c ("net: dsa: sja1105: Add FDB operations for P/Q/R/S series")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.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.