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Add a new vet analyzer that checks t.Run subtest names don't contain
characters requiring quoting when re-running via "go test -run". This
enforces the style guide rule: don't use spaces or punctuation in
subtest names.
The analyzer flags:
- Direct t.Run calls with string literal names containing spaces,
regex metacharacters, quotes, or other problematic characters
- Table-driven t.Run(tt.name, ...) calls where tt ranges over a
slice/map literal with bad name field values
Also fix all 978 existing violations across 81 test files, replacing
spaces with hyphens and shortening long sentence-like names to concise
hyphenated forms.
Updates #19242
Change-Id: Ib0ad96a111bd8e764582d1d4902fe2599454ab65
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
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On Linux batching.Conn will now write a vector of
coalesced buffers via sendmmsg(2) instead of copying
fragments into a single buffer.
Scatter-gather I/O has been available on Linux since the
earliest days (reworked in 2.6.24). Kernel passes fragments
to the driver if it supports it, otherwise linearizes
upon receiving the data.
Removing the copy overhead from userspace yields up to 4-5%
packet and bitrate improvement on Linux with GSO enabled:
46Gb/s 4.4m pps vs 44Gb/s 4.2m pps w/32 Peer Relay client flows.
Updates tailscale/corp#36989
Change-Id: Idb2248d0964fb011f1c8f957ca555eab6a6a6964
Signed-off-by: Alex Valiushko <alexvaliushko@tailscale.com>
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These were previously swappable for historical reasons that are no
longer relevant.
Removing the indirection enables future inlining optimizations if we
simplify further.
Updates tailscale/corp#38703
Signed-off-by: Jordan Whited <jordan@tailscale.com>
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For the purpose of improved observability of UDP socket receive buffer
overflows on Linux.
Updates tailscale/corp#37679
Signed-off-by: Jordan Whited <jordan@tailscale.com>
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ReadFromUDPAddrPort worked if UDP GRO was unsupported, but we don't
actually want attempted usage, nor does any exist today. Future work
on tailscale/corp#37679 would have required more complexity in this
method, vs clarifying the API intents.
Updates tailscale/corp#37679
Signed-off-by: Jordan Whited <jordan@tailscale.com>
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This file was never truly necessary and has never actually been used in
the history of Tailscale's open source releases.
A Brief History of AUTHORS files
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The AUTHORS file was a pattern developed at Google, originally for
Chromium, then adopted by Go and a bunch of other projects. The problem
was that Chromium originally had a copyright line only recognizing
Google as the copyright holder. Because Google (and most open source
projects) do not require copyright assignemnt for contributions, each
contributor maintains their copyright. Some large corporate contributors
then tried to add their own name to the copyright line in the LICENSE
file or in file headers. This quickly becomes unwieldy, and puts a
tremendous burden on anyone building on top of Chromium, since the
license requires that they keep all copyright lines intact.
The compromise was to create an AUTHORS file that would list all of the
copyright holders. The LICENSE file and source file headers would then
include that list by reference, listing the copyright holder as "The
Chromium Authors".
This also become cumbersome to simply keep the file up to date with a
high rate of new contributors. Plus it's not always obvious who the
copyright holder is. Sometimes it is the individual making the
contribution, but many times it may be their employer. There is no way
for the proejct maintainer to know.
Eventually, Google changed their policy to no longer recommend trying to
keep the AUTHORS file up to date proactively, and instead to only add to
it when requested: https://opensource.google/docs/releasing/authors.
They are also clear that:
> Adding contributors to the AUTHORS file is entirely within the
> project's discretion and has no implications for copyright ownership.
It was primarily added to appease a small number of large contributors
that insisted that they be recognized as copyright holders (which was
entirely their right to do). But it's not truly necessary, and not even
the most accurate way of identifying contributors and/or copyright
holders.
In practice, we've never added anyone to our AUTHORS file. It only lists
Tailscale, so it's not really serving any purpose. It also causes
confusion because Tailscalars put the "Tailscale Inc & AUTHORS" header
in other open source repos which don't actually have an AUTHORS file, so
it's ambiguous what that means.
Instead, we just acknowledge that the contributors to Tailscale (whoever
they are) are copyright holders for their individual contributions. We
also have the benefit of using the DCO (developercertificate.org) which
provides some additional certification of their right to make the
contribution.
The source file changes were purely mechanical with:
git ls-files | xargs sed -i -e 's/\(Tailscale Inc &\) AUTHORS/\1 contributors/g'
Updates #cleanup
Change-Id: Ia101a4a3005adb9118051b3416f5a64a4a45987d
Signed-off-by: Will Norris <will@tailscale.com>
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From #17842
Updates #cleanup
Change-Id: Ie041b50659361b50558d5ec1f557688d09935f7c
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
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Fixes #17835
Signed-off-by: Sachin Iyer <siyer@detail.dev>
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This significantly improves throughput of a peer relay server on Linux.
Server.packetReadLoop no longer passes sockets down the stack. Instead,
packet handling methods return a netip.AddrPort and []byte, which
packetReadLoop gathers together for eventual batched writes on the
appropriate socket(s).
Updates tailscale/corp#31164
Signed-off-by: Jordan Whited <jordan@tailscale.com>
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Updates #cleanup
Signed-off-by: Jordan Whited <jordan@tailscale.com>
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For eventual use by net/udprelay.Server.
Updates tailscale/corp#31164
Signed-off-by: Jordan Whited <jordan@tailscale.com>
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