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[ Upstream commit f822e9c4ffa511a5c681cf866287d9383a3b6f1b ] GEM_MAX_TX_LEN currently resolves to 0x3FF8 for any IP version supporting TSO with full 14bits of length field in payload descriptor. But an IP errata causes false amba_error (bit 6 of ISR) when length in payload descriptors is specified above 16387. The error occurs because the DMA falsely concludes that there is not enough space in SRAM for incoming payload. These errors were observed continuously under stress of large packets using iperf on a version where SRAM was 16K for each queue. This errata will be documented shortly and affects all versions since TSO functionality was added. Hence limit the max length to 0x3FC0 (rounded). Signed-off-by: Harini Katakam <harini.katakam@xilinx.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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| README | ||
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.