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This patch makes multiple changes that can't be separated:
1) Allocate plain RX buffers via a page pool instead of allocating
SKBs, then use build_skb() when a packet is received.
2) For GbEth IP, reduce the RX buffer size to 2kB.
3) For GbEth IP, merge packets which span more than one RX descriptor
as SKB fragments instead of copying data.
Implementing (1) without (2) would require the use of an order-1 page
pool (instead of an order-0 page pool split into page fragments) for
GbEth.
Implementing (2) without (3) would leave us no space to re-assemble
packets which span more than one RX descriptor.
Implementing (3) without (1) would not be possible as the network stack
expects to use put_page() or page_pool_put_page() to free SKB fragments
after an SKB is consumed.
RX checksum offload support is adjusted to handle both linear and
nonlinear (fragmented) packets.
This patch gives the following improvements during testing with iperf3.
* RZ/G2L:
* TCP RX: same bandwidth at -43% CPU load (70% -> 40%)
* UDP RX: same bandwidth at -17% CPU load (88% -> 74%)
* RZ/G2UL:
* TCP RX: +30% bandwidth (726Mbps -> 941Mbps)
* UDP RX: +417% bandwidth (108Mbps -> 558Mbps)
* RZ/G3S:
* TCP RX: +64% bandwidth (562Mbps -> 920Mbps)
* UDP RX: +420% bandwidth (90Mbps -> 468Mbps)
* RZ/Five:
* TCP RX: +217% bandwidth (145Mbps -> 459Mbps)
* UDP RX: +470% bandwidth (20Mbps -> 114Mbps)
There is no significant impact on bandwidth or CPU load in testing on
RZ/G2H or R-Car M3N.
Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Signed-off-by: Paolo Abeni <pabeni@redhat.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 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.