e445f08af2
Tx copybreak buf size is used for tx copybreak feature, the feature is used for small size packet or frag. It adds a queue based tx shared bounce buffer to memcpy the small packet when the len of xmitted skb is below tx_copybreak(value to distinguish small size and normal size), and reduce the overhead of dma map and unmap when IOMMU is on. Support setting it via ethtool --set-tunable parameter and getting it via ethtool --get-tunable parameter. Signed-off-by: Hao Chen <chenhao288@hisilicon.com> Signed-off-by: Guangbin Huang <huangguangbin2@huawei.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.