9e4ed359b8
Add a new socket command which returns tx time stamps to the user. It provide an alternative to the existing error queue recvmsg interface. The command works in a polled multishot mode, which means io_uring will poll the socket and keep posting timestamps until the request is cancelled or fails in any other way (e.g. with no space in the CQ). It reuses the net infra and grabs timestamps from the socket's error queue. The command requires IORING_SETUP_CQE32. All non-final CQEs (marked with IORING_CQE_F_MORE) have cqe->res set to the tskey, and the upper 16 bits of cqe->flags keep tstype (i.e. offset by IORING_CQE_BUFFER_SHIFT). The timevalue is store in the upper part of the extended CQE. The final completion won't have IORING_CQE_F_MORE and will have cqe->res storing 0/error. Suggested-by: Vadim Fedorenko <vadim.fedorenko@linux.dev> Acked-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/92ee66e6b33b8de062a977843d825f58f21ecd37.1750065793.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk> |
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|---|---|---|
| Documentation | ||
| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .pylintrc | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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 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.