mirror of
https://git.FreeBSD.org/src.git
synced 2024-11-24 07:40:52 +00:00
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 |
||
|---|---|---|
| .. | ||
| amd64 | ||
| arm | ||
| arm64 | ||
| bsm | ||
| cam | ||
| cddl | ||
| compat | ||
| conf | ||
| contrib | ||
| crypto | ||
| ddb | ||
| dev | ||
| dts | ||
| fs | ||
| gdb | ||
| geom | ||
| gnu | ||
| i386 | ||
| isa | ||
| kern | ||
| kgssapi | ||
| libkern | ||
| modules | ||
| net | ||
| net80211 | ||
| netgraph | ||
| netinet | ||
| netinet6 | ||
| netipsec | ||
| netlink | ||
| netpfil | ||
| netsmb | ||
| nfs | ||
| nfsclient | ||
| nfsserver | ||
| nlm | ||
| ofed | ||
| opencrypto | ||
| powerpc | ||
| riscv | ||
| rpc | ||
| security | ||
| sys | ||
| teken | ||
| tests | ||
| tools | ||
| ufs | ||
| vm | ||
| x86 | ||
| xdr | ||
| xen | ||
| Makefile | ||
| README.md | ||
FreeBSD Kernel Source:
This directory contains the source files and build glue that make up the FreeBSD kernel and its modules, including both original and contributed software.
Kernel configuration files are located in the conf/ subdirectory of each
architecture. GENERIC is the configuration used in release builds. NOTES
contains documentation of all possible entries. LINT is a compile-only
configuration used to maximize build coverage and detect regressions.
Documentation:
Source code documentation is maintained in a set of man pages, under section 9.
These pages are located in share/man/man9, from the
top-level of the src tree. Consult intro(9)
for an overview of existing pages.
Some additional high-level documentation of the kernel is maintained in the Architecture Handbook.
Source Roadmap:
| Directory | Description |
|---|---|
| amd64 | AMD64 (64-bit x86) architecture support |
| arm | 32-bit ARM architecture support |
| arm64 | 64-bit ARM (AArch64) architecture support |
| cam | Common Access Method storage subsystem - cam(4) and ctl(4) |
| cddl | CDDL-licensed optional sources such as DTrace |
| conf | kernel build glue |
| compat | Linux compatibility layer, FreeBSD 32-bit compatibility |
| contrib | 3rd-party imported software such as OpenZFS |
| crypto | crypto drivers |
| ddb | interactive kernel debugger - ddb(4) |
| fs | most filesystems, excluding UFS, NFS, and ZFS |
| dev | device drivers and other arch independent code |
| gdb | kernel remote GDB stub - gdb(4) |
| geom | GEOM framework - geom(4) |
| i386 | i386 (32-bit x86) architecture support |
| kern | main part of the kernel |
| libkern | libc-like and other support functions for kernel use |
| modules | kernel module infrastructure |
| net | core networking code |
| net80211 | wireless networking (IEEE 802.11) - net80211(4) |
| netgraph | graph-based networking subsystem - netgraph(4) |
| netinet | IPv4 protocol implementation - inet(4) |
| netinet6 | IPv6 protocol implementation - inet6(4) |
| netipsec | IPsec protocol implementation - ipsec(4) |
| netpfil | packet filters - ipfw(4), pf(4), and ipfilter(4) |
| opencrypto | OpenCrypto framework - crypto(7) |
| powerpc | PowerPC/POWER (32 and 64-bit) architecture support |
| riscv | 64-bit RISC-V architecture support |
| security | security facilities - audit(4) and mac(4) |
| sys | kernel headers |
| tests | kernel unit tests |
| ufs | Unix File System - ffs(4) |
| vm | virtual memory system |
| x86 | code shared by AMD64 and i386 architectures |