3a18d75400
qeth has been supporting multiple HW Output Queues for a long time. But rather than exposing those queues to the stack, it uses its own queue selection logic in .ndo_start_xmit... with all the drawbacks that entails. Start off by switching IQD devices over to a proper mqs net_device, and converting all the netdev_queue management code. One oddity with IQD devices is the requirement to place all mcast traffic on the _highest_ established HW queue. Doing so via .ndo_select_queue seems straight-forward - but that won't work if only some of the HW queues are active (ie. when dev->real_num_tx_queues < dev->num_tx_queues), since netdev_cap_txqueue() will not allow us to put skbs on the higher queues. To make this work, we 1. let .ndo_select_queue() map all mcast traffic to netdev_queue 0, and 2. later re-map the netdev_queue and HW queue indices in .ndo_start_xmit and the TX completion handler. With this patch we default to a fixed set of 1 ucast and 1 mcast queue. Support for dynamic reconfiguration is added at a later time. Signed-off-by: Julian Wiedmann <jwi@linux.ibm.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.