fb529e62d3
Its not enough to check for available tcp send space. We also hold on to transmitted data for mptcp-level retransmits. Right now we will send more and more data if the peer can ack data at the tcp level fast enough, since that frees up tcp send buffer space. But we also need to check that data was acked and reclaimed at the mptcp level. Therefore add needed check in mptcp_sendmsg, flush tcp data and wait until more mptcp snd space becomes available if we are over the limit. Before we wait for more data, also make sure we start the retransmit timer if we ran out of sndbuf space. Otherwise there is a very small chance that we wait forever: * receiver is waiting for data * sender is blocked because mptcp socket buffer is full * at tcp level, all data was acked * mptcp-level snd_una was not updated, because last ack that acknowledged the last data packet carried an older MPTCP-ack. Restarting the retransmit timer avoids this problem: if TCP subflow is idle, data is retransmitted from the RTX queue. New data will make the peer send a new, updated MPTCP-Ack. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: David S. Miller <davem@davemloft.net> |
||
|---|---|---|
| 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.