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673d7ab756
The driver allocates a single doorbell per device and uses it for all Send Queues (SQs). This can become a bottleneck due to the high number of concurrent MMIO accesses when ringing the same doorbell from many channels. This patch makes the doorbells used by channel queues configurable. mlx5e_channel_pick_doorbell() is added to select the doorbell to be used for a given channel, picking the default for now. When opening a channel, the selected doorbell is saved to the channel struct and used whenever channel-related queues are created. Finally, 'uar_page' is added to 'struct mlx5e_create_sq_param' to control which doorbell to use when allocating an SQ, since that can happen outside channel context (e.g. for PTP). Signed-off-by: Cosmin Ratiu <cratiu@nvidia.com> Reviewed-by: Dragos Tatulea <dtatulea@nvidia.com> Signed-off-by: Tariq Toukan <tariqt@nvidia.com> Reviewed-by: Simon Horman <horms@kernel.org> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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 reStructuredText 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.