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Channels are FIFO which means we have guaranteed cache misses.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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Suggested-by: Josh Bleecher Snyder <josh@tailscale.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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This is what modules are for, and Go binaries can introspect.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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benchmark old ns/op new ns/op delta
BenchmarkUAPIGet-16 2872 2157 -24.90%
benchmark old allocs new allocs delta
BenchmarkUAPIGet-16 30 18 -40.00%
benchmark old bytes new bytes delta
BenchmarkUAPIGet-16 737 256 -65.26%
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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It's a separate type of key that gets hashed into the chain.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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This moves to a simple queue with no routine processing it, to reduce
scheduler pressure.
This splits latency in half!
benchmark old ns/op new ns/op delta
BenchmarkThroughput-16 2394 2364 -1.25%
BenchmarkLatency-16 259652 120810 -53.47%
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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This makes the IpcGet method much faster.
We also refactor the traversal API to use a callback so that we don't
need to allocate at all. Avoiding allocations we do self-masking on
insertion, which in turn means that split intermediate nodes require a
copy of the bits.
benchmark old ns/op new ns/op delta
BenchmarkUAPIGet-16 3243 2659 -18.01%
benchmark old allocs new allocs delta
BenchmarkUAPIGet-16 35 30 -14.29%
benchmark old bytes new bytes delta
BenchmarkUAPIGet-16 1218 737 -39.49%
This benchmark is good, though it's only for a pair of peers, each with
only one allowedips. As this grows, the delta expands considerably.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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There are very few cases, if any, in which a user only wants one of
these levels, so combine it into a single level.
While we're at it, reduce indirection on the loggers by using an empty
function rather than a nil function pointer. It's not like we have
retpolines anyway, and we were always calling through a function with a
branch prior, so this seems like a net gain.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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This commit overhauls wireguard-go's logging.
The primary, motivating change is to use a function instead
of a *log.Logger as the basic unit of logging.
Using functions provides a lot more flexibility for
people to bring their own logging system.
It also introduces logging helper methods on Device.
These reduce line noise at the call site.
They also allow for log functions to be nil;
when nil, instead of generating a log line and throwing it away,
we don't bother generating it at all.
This spares allocation and pointless work.
This is a breaking change, although the fix required
of clients is fairly straightforward.
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
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The declaration of err in
nextByte, err := buffered.ReadByte
shadows the declaration of err in
op, err := buffered.ReadString('\n')
above. As a result, the assignments to err in
err = ipcErrorf(ipc.IpcErrorInvalid, "trailing character in UAPI get: %c", nextByte)
and in
err = device.IpcGetOperation(buffered.Writer)
do not modify the correct err variable.
Found by staticcheck.
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
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Caught by go vet.
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
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Plenty more to go, but a start:
name old time/op new time/op delta
UAPIGet-4 6.37µs ± 2% 5.56µs ± 1% -12.70% (p=0.000 n=8+8)
name old alloc/op new alloc/op delta
UAPIGet-4 1.98kB ± 0% 1.22kB ± 0% -38.71% (p=0.000 n=10+10)
name old allocs/op new allocs/op delta
UAPIGet-4 42.0 ± 0% 35.0 ± 0% -16.67% (p=0.000 n=10+10)
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
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Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
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Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
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The original spec ends with \n\n especially for this reason.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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Interleaves IpcSetOperations would spell trouble.
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
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Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
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Also, a behavior change: Stop treating a blank value as 0.
It's not in the spec.
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
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Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
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Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
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Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
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Unify the handling of unexpected UAPI errors.
The comment that says "should never happen" is incorrect;
this could happen due to I/O errors. Correct it.
Change error message capitalization for consistency.
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
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The goal of this change is to make the structure
of IpcSetOperation easier to follow.
IpcSetOperation contains a small state machine:
It starts by configuring the device,
then shifts to configuring one peer at a time.
Having the code all in one giant method obscured that structure.
Split out the parts into helper functions and encapsulate the peer state.
This makes the overall structure more apparent.
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
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Expand IPCError to contain a wrapped error,
and add a helper to make constructing such errors easier.
Add a defer-based "log on returned error" to IpcSetOperation.
This lets us simplify all of the error return paths.
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
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If device.NewPeer returns a nil error,
then the returned peer is always non-nil.
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
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The code as written will drop any read errors on the floor.
Fix that.
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
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In order to avoid even the flirtation with passing on these dependencies
to ordinary consumers of wireguard-go, this commit makes a new go.mod
that's entirely separate from the root one.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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The Go linker isn't smart enough to prevent gvisor from being pulled
into modules that use other parts of tun/, due to the types exposed. So,
we put this into its own standalone module.
We use this as an opportunity to introduce some example code as well.
I'm still not happy that this not only clutters this repo's go.sum, but
all the other projects that consume it, but it seems like making a new
module inside of this repo will lead to even greater confusion.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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Until we depend on Go 1.16 (which isn't released yet), alias our own
variable to the private member of the net package. This will allow an
easy find replace to make this go away when we eventually switch to
1.16.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
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