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By default, the VCAP IS2 will produce a single match for each frame, on the most specific classification. Example: a ping packet (ICMP over IPv4 over Ethernet) sent from an IP address of 10.0.0.1 and a MAC address of 96:18:82:00:04:01 will match this rule: tc filter add dev swp0 ingress protocol ipv4 \ flower skip_sw src_ip 10.0.0.1 action drop but not this one: tc filter add dev swp0 ingress \ flower skip_sw src_mac 96:18:82:00:04:01 action drop Currently the driver does not really warn the user in any way about this, and the behavior is rather strange anyway. The current patch is a workaround to force matches on MAC_ETYPE keys (DMAC and SMAC) for all packets irrespective of higher layer protocol. The setting is made at the port level. Of course this breaks all other non-src_mac and non-dst_mac matches, so rule exclusivity checks have been added to the driver, in order to never have rules of both types on any ingress port. The bits that discard higher-level protocol information are set only once a MAC_ETYPE rule is added to a filter block, and only for the ports that are bound to that filter block. Then all further non-MAC_ETYPE rules added to that filter block should be denied by the ports bound to it. 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.