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ENETC implement time specific departure capability, which enables the user to specify when a frame can be transmitted. When this capability is enabled, the device will delay the transmission of the frame so that it can be transmitted at the precisely specified time. The delay departure time up to 0.5 seconds in the future. If the departure time in the transmit BD has not yet been reached, based on the current time, the packet will not be transmitted. This driver was loaded by Qos driver ETF. User could load it by tc commands. Here are the example commands: tc qdisc add dev eth0 root handle 1: mqprio \ num_tc 8 map 0 1 2 3 4 5 6 7 hw 1 tc qdisc replace dev eth0 parent 1:8 etf \ clockid CLOCK_TAI delta 30000 offload These example try to set queue mapping first and then set queue 7 with 30us ahead dequeue time. Then user send test frame should set SO_TXTIME feature for socket. There are also some limitations for this feature in hardware: - Transmit checksum offloads and time specific departure operation are mutually exclusive. - Time Aware Shaper feature (Qbv) offload and time specific departure operation are mutually exclusive. Signed-off-by: Po Liu <Po.Liu@nxp.com> Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
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| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
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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.