72511aab95
The transmit loop continues to xmit new data until an error is returned or all data was transmitted. For the blocking i/o case, this means that tcp_sendpages() may block on the subflow until more space becomes available, i.e. we end up sleeping with the mptcp socket lock held. Instead we should check if a different subflow is ready to be used. This restarts the subflow sk lookup when the tx operation succeeded and the tcp subflow can't accept more data or if tcp_sendpages indicates -EAGAIN on a blocking mptcp socket. In that case we also need to set the NOSPACE bit to make sure we get notified once memory becomes available. In case all subflows are busy, the existing logic will wait until a subflow is ready, releasing the mptcp socket lock while doing so. The mptcp worker already sets DONTWAIT, so no need to make changes there. v2: * set NOSPACE bit * add a comment to clarify that mptcp-sk sndbuf limits need to be checked as well. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: David S. Miller <davem@davemloft.net> |
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|---|---|---|
| Documentation | ||
| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| 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 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.