mirror of https://github.com/torvalds/linux.git
7070eea5e9
Each ENETC station interface (SI) has a VLAN filter list and a port flag (PSIPVMR) by which it can be put in "VLAN promiscuous" mode, which enables the reception of VLAN-tagged traffic even if it is not in the VLAN filtering list. Currently the handling of this setting works like this: the port starts off as VLAN promiscuous, then it switches to enabling VLAN filtering as soon as the first VLAN is installed in its filter via .ndo_vlan_rx_add_vid. In practice that does not work out very well, because more often than not, the first VLAN to be installed is out of the control of the user: the 8021q module, if loaded, adds its rule for 802.1p (VID 0) traffic upon bringing the interface up. What the user is currently seeing in ethtool is this: ethtool -k eno2 rx-vlan-filter: on [fixed] which doesn't match the intention of the code, but the practical reality of having the 8021q module install its VID which has the side-effect of turning on VLAN filtering in this driver. All in all, a slightly confusing experience. So instead of letting this driver switch the VLAN filtering state by itself, just wire it up with the rx-vlan-filter feature from ethtool, and let it be user-configurable just through that knob, except for one case, see below. In promiscuous mode, it is more intuitive that all traffic is received, including VLAN tagged traffic. It appears that it is necessary to set the flag in PSIPVMR for that to be the case, so VLAN promiscuous mode is also temporarily enabled. On exit from promiscuous mode, the setting made by ethtool is restored. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Reviewed-by: Claudiu Manoil <claudiu.manoil@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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| Documentation | ||
| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
README
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.