f993740ee0
A misconfigured system (e.g. with all interrupts affinitised to all CPUs) may produce a storm of ARFS steering events. With the existing sfc ARFS implementation, that could create a backlog of workitems that grinds the system to a halt. To prevent this, limit the number of workitems that may be in flight for a given SFC device to 8 (EFX_RPS_MAX_IN_FLIGHT), and return EBUSY from our ndo_rx_flow_steer method if the limit is reached. Given this limit, also store the workitems in an array of slots within the struct efx_nic, rather than dynamically allocating for each request. The limit should not negatively impact performance, because it is only likely to be hit in cases where ARFS will be ineffective anyway. Signed-off-by: Edward Cree <ecree@solarflare.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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.