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544fe7c2e6
To support multipath offload we are going to track SW multipath route and related nexthops. To do that we register to FIB notifier and handle the route and next-hops events and reflect that as port affinity to HW. When there is a new multipath route entry that all next-hops are the ports of an HCA we will activate LAG in HW. Egress wise, we use HW LAG as the means to emulate multipath on current HW which doesn't support port selection based on xmit hash. In the presence of multiple VFs which use multiple SQs (send queues) this yields fairly good distribution. HA wise, HW LAG buys us the ability for a given RQ (receive queue) to receive traffic from both ports and for SQs to migrate xmitting over the active port if their base port fails. When the route entry is being updated to single path we will update the HW port affinity to use that port only. If a next-hop becomes dead we update the HW port affinity to the living port. When all next-hops are alive again we reset the affinity to default. Due to FW/HW limitations, when a route is deleted we are not disabling the HW LAG since doing so will not allow us to enable it again while VFs are bounded. Typically this is just a temporary state when a routing daemon removes dead routes and later adds them back as needed. This patch only handles events for AF_INET. Signed-off-by: Roi Dayan <roid@mellanox.com> Reviewed-by: Or Gerlitz <ogerlitz@mellanox.com> Signed-off-by: Saeed Mahameed <saeedm@mellanox.com> |
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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.