d99eb8230e
I found I was getting constant device timeouts when doing anything more complicated than a single SSH on laptop with RTL8811AU. After digging into it, i found a variety of fun situations, including traffic stalls that would recover w/ a shorter (1 second) USB transfer timeout. However, the big one is a straight up hang of any TX endpoint until the NIC was reset. The RX side kept going just fine; only the TX endpoints would hang. Reproducing it was easy - just start up a couple of traffic streams on different WME AC's - eg a best effort + bulk transfer, like browsing the web and doing an ssh clone - throw in a ping -i 0.1 to your gateway, and it would very quickly hit device timeouts every couple of seconds. I put everything into a single TX EP and the hangs went away. Well, mostly. So after some MORE digging, I found that this driver isn't checking if the transfers are going into the correct EPs for the packet WME access category / 802.11 TID; and would frequently be able to schedule multiple transfers into the same endpoint. Then there's a second problem - there's an array of endpoints used for setting up the USB device, with .endpoint = UE_ADDR_ANY, however they're also being setup with the same endpoint configured in multiple transfer configs. Eg, a NIC with 3 or 4 bulk TX endpoints will configure the BK and BE endpoints with the same physical endpoint ID. This also leads to timed out transfers. My /guess/ was that the firmware isn't happy with one or both of the above, and so I solved both. * drop the USB transfer timeout to 1 second, not 5 seconds - that way we'll either get a 1 second traffic pause and USB transfer failure, or a 5 second device timeout. Having both the TX timeout and the USB transfer timeout made recovery from a USB transfer timeout (without a NIC reset) almost impossible. * enforce one transfer per endpoint; * separate pending/active buffer tracking per endpoint; * each endpoint now has its own TX callback to make sure the queue / end point ID is known; * and only frames from a given endpoint pending queue is going into the active queue and into that endpoint. * Finally, create a local wme2qid array and populate it with the endpoint mapping that ensures unique physical endpoint use. Locally tested: * rtl8812AU, 11n STA mode * rtl8192EU, 11n STA mode (with diffs to fix the channel config / power timeouts.) Differential Revision: https://reviews.freebsd.org/D47522 |
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| .cirrus-ci | ||
| .github | ||
| bin | ||
| cddl | ||
| contrib | ||
| crypto | ||
| etc | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| lib | ||
| libexec | ||
| release | ||
| rescue | ||
| sbin | ||
| secure | ||
| share | ||
| stand | ||
| sys | ||
| targets | ||
| tests | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| .arcconfig | ||
| .arclint | ||
| .cirrus.yml | ||
| .clang-format | ||
| .git-blame-ignore-revs | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| CONTRIBUTING.md | ||
| COPYRIGHT | ||
| LOCKS | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc1 | ||
| Makefile.libcompat | ||
| Makefile.sys.inc | ||
| ObsoleteFiles.inc | ||
| README.md | ||
| RELNOTES | ||
| UPDATING | ||
FreeBSD Source:
This is the top level of the FreeBSD source directory.
FreeBSD is an operating system used to power modern servers, desktops, and embedded platforms. A large community has continually developed it for more than thirty years. Its advanced networking, security, and storage features have made FreeBSD the platform of choice for many of the busiest web sites and most pervasive embedded networking and storage devices.
For copyright information, please see the file COPYRIGHT in this directory. Additional copyright information also exists for some sources in this tree - please see the specific source directories for more information.
The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree. See build(7), config(8), FreeBSD handbook on building userland, and Handbook for kernels for more information, including setting make(1) variables.
For information on the CPU architectures and platforms supported by FreeBSD, see the FreeBSD website's Platforms page.
For official FreeBSD bootable images, see the release page.
Source Roadmap:
| Directory | Description |
|---|---|
| bin | System/user commands. |
| cddl | Various commands and libraries under the Common Development and Distribution License. |
| contrib | Packages contributed by 3rd parties. |
| crypto | Cryptography stuff (see crypto/README). |
| etc | Template files for /etc. |
| gnu | Commands and libraries under the GNU General Public License (GPL) or Lesser General Public License (LGPL). Please see gnu/COPYING and gnu/COPYING.LIB for more information. |
| include | System include files. |
| kerberos5 | Kerberos5 (Heimdal) package. |
| lib | System libraries. |
| libexec | System daemons. |
| release | Release building Makefile & associated tools. |
| rescue | Build system for statically linked /rescue utilities. |
| sbin | System commands. |
| secure | Cryptographic libraries and commands. |
| share | Shared resources. |
| stand | Boot loader sources. |
| sys | Kernel sources (see sys/README.md). |
| targets | Support for experimental DIRDEPS_BUILD |
| tests | Regression tests which can be run by Kyua. See tests/README for additional information. |
| tools | Utilities for regression testing and miscellaneous tasks. |
| usr.bin | User commands. |
| usr.sbin | System administration commands. |
For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see FreeBSD Handbook.