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2f4f44946b
When the ASIC detects that a unicast packet is routed through the same router interface (RIF) from which it ingressed (iRIF == eRIF), it raises a trap called loopback error (LBERROR). Thus far, this trap was configured to send a sole copy of the packet to the CPU so that ICMP redirect packets could be potentially generated by the kernel. This is problematic as the CPU cannot forward packets at 3.2Tb/s and there are scenarios (e.g., "one-armed router") where iRIF == eRIF is not an exception. Solve this by changing the trap to send a copy of the packet to the CPU. To prevent the kernel from forwarding the packet again, it is marked with 'offload_l3_fwd_mark'. The trap is configured in a trap group of its own with a dedicated policer in order not to prevent packets trapped by other traps from reaching the CPU. Signed-off-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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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.