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When in hardware lag and the NIC has more than 2 ports when one port goes down need to distribute the traffic between the remaining active ports. For better spread in such cases instead of using 1-to-1 mapping and only 4 slots in the hash, use many. Each port will have many slots that point to it. When a port goes down go over all the slots that pointed to that port and spread them between the remaining active ports. Once the port comes back restore the default mapping. We will have number_of_ports * MLX5_LAG_MAX_HASH_BUCKETS slots. Each MLX5_LAG_MAX_HASH_BUCKETS belong to a different port. The native mapping is such that: port 1: The first MLX5_LAG_MAX_HASH_BUCKETS slots are: [1, 1, .., 1] which means if a packet is hased into one of this slots it will hit the wire via port 1. port 2: The second MLX5_LAG_MAX_HASH_BUCKETS slots are: [2, 2, .., 2] which means if a packet is hased into one of this slots it will hit the wire via port2. and this mapping is the same of the rest of the ports. On a failover, lets say port 2 goes down (port 1, 3, 4 are still up). the new mapping for port 2 will be: port 2: The second MLX5_LAG_MAX_HASH_BUCKETS are: [1, 3, 1, 4, .., 4] which means the mapping was changed from the native mapping to a mapping that consists of only the active ports. With this if a port goes down the traffic will be split between the active ports randomly Signed-off-by: Mark Bloch <mbloch@nvidia.com> Reviewed-by: Maor Gottlieb <maorg@nvidia.com> Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
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.