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.vscode/
*.cpu
*.mem
*.test

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LICENSE
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MIT License MIT License
Copyright (c) 2021 Ii64人 Copyright (c) 2022 gouring Author
Permission is hereby granted, free of charge, to any person obtaining a copy Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal of this software and associated documentation files (the "Software"), to deal

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test:
go test -c -gcflags=all=-d=checkptr .
./gouring.test
clean:
rm -rf *.test

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README.md
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# gouring # gouring
[![License: MIT][1]](LICENSE)
[![Go Reference][2]][3]
[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](LICENSE)
[![Go Reference](https://pkg.go.dev/badge/github.com/ii64/gouring.svg)](https://pkg.go.dev/github.com/ii64/gouring)
Low-level io uring library ```bash
```
go get github.com/ii64/gouring go get github.com/ii64/gouring
``` ```
## Example ## Example
```go ```go
import "github.com/ii64/gouring" // setup
import "github.com/ii64/gouring/queue" h, err := gouring.New(256, 0)
if err != nil { /*...*/ }
defer h.Close()
// io_uring_setup sqe := h.GetSQE()
ring, err := gouring.New(256, nil) // default io uring setup param b := []byte("io_uring!\n")
if err != nil { PrepWrite(sqe, 1, &b[0], len(b), 0)
// ...
}
defer ring.Close() // munmap shared memory, cleanup
var (
ret int
err error
)
// io_uring_register submitted, err := h.SubmitAndWait(1)
ret, err = ring.Register(gouring.IORING_REGISTER_BUFFERS, addr, nrArg) if err != nil { /*...*/ }
println(submitted) // 1
// io_uring_enter var cqe *gouring.IoUringCqe
ret, err = ring.Enter(toSubmit, minComplete, gouring.IORING_ENTER_GETEVENTS, nil) err = h.WaitCqe(&cqe)
if err != nil { /*...*/ } // check also EINTR
// setup param _ = cqe.UserData
params := ring.Params() _ = cqe.Res
_ = cqe.Flags
// ring fd
fd := ring.Fd()
// Submission Queue
sq := ring.SQ()
// Completion Queue
cq := ring.CQ()
/* Using queue package */
q := queue.New(ring)
go func() {
q.Run(func(cqe *gouring.CQEntry) {
// cqe processing
_ = cqe.UserData
_ = cqe.Res
_ = cqe.Flags
})
}()
// buffer
data := []byte("print on stdout\n")
// get sqe
sqe := q.GetSQEntry()
sqe.UserData = 0 // identifier / event id
sqe.Opcode = gouring.IORING_OP_WRITE // op write
sqe.Fd = int32(syscall.Stdout) // fd 1
sqe.Len = uint32(len(data)) // buffer size
sqe.SetOffset(0) // fd offset
sqe.SetAddr(&data[0]) // buffer addr
// submit sqe
submitted, err := q.Submit()
if err != nil {
// ...
}
``` ```
### Referece ## Graph
[github.com/iceber/iouring-go](https://github.com/iceber/iouring-go)
| SQPOLL | non-SQPOLL |
| ------ | ---------- |
| ![sqpoll_fig][sqpoll_fig] | ![nonsqpoll_fig][nonsqpoll_fig] |
### Reference
https://github.com/axboe/liburing
[1]: https://img.shields.io/badge/License-MIT-yellow.svg
[2]: https://pkg.go.dev/badge/github.com/ii64/gouring.svg
[3]: https://pkg.go.dev/github.com/ii64/gouring
[sqpoll_fig]: assets/sqpoll.svg
[nonsqpoll_fig]: assets/nonsqpoll.svg

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<g id="a_edge5"><a xlink:title="github.com/ii64/gouring.(*IoUring).__io_uring_submit_and_wait -> github.com/ii64/gouring.(*IoUring).__io_uring_submit (79.50s)">
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<polygon fill="#b21100" stroke="#b21100" stroke-width="4" points="186.5,-437.14 183,-427.14 179.5,-437.14 186.5,-437.14"></polygon>
</a>
</g>
<g id="a_edge5-label"><a xlink:title="github.com/ii64/gouring.(*IoUring).__io_uring_submit_and_wait -> github.com/ii64/gouring.(*IoUring).__io_uring_submit (79.50s)">
<text text-anchor="middle" x="203" y="-453.8" font-family="Times,serif" font-size="14.00"> 79.50s</text>
</a>
</g>
</g>
<!-- N6 -->
<g id="node6" class="node">
<title>N6</title>
<g id="a_node6"><a xlink:title="github.com/ii64/gouring.(*IoUring).io_uring_wait_cqe (9.82s)">
<polygon fill="#ede8e2" stroke="#b28c63" points="341,-680 243,-680 243,-612 341,-612 341,-680"></polygon>
<text text-anchor="middle" x="292" y="-667.2" font-family="Times,serif" font-size="11.00">gouring</text>
<text text-anchor="middle" x="292" y="-655.2" font-family="Times,serif" font-size="11.00">(*IoUring)</text>
<text text-anchor="middle" x="292" y="-643.2" font-family="Times,serif" font-size="11.00">io_uring_wait_cqe</text>
<text text-anchor="middle" x="292" y="-631.2" font-family="Times,serif" font-size="11.00">2.44s (2.19%)</text>
<text text-anchor="middle" x="292" y="-619.2" font-family="Times,serif" font-size="11.00">of 9.82s (8.83%)</text>
</a>
</g>
</g>
<!-- N6&#45;&gt;N4 -->
<g id="edge11" class="edge">
<title>N6-&gt;N4</title>
<g id="a_edge11"><a xlink:title="github.com/ii64/gouring.(*IoUring).io_uring_wait_cqe -> github.com/ii64/gouring.(*IoUring).__io_uring_peek_cqe (7.38s)">
<path fill="none" stroke="#b29877" d="M302.01,-611.99C305.84,-599.38 310.28,-584.74 314.44,-571.01"></path>
<polygon fill="#b29877" stroke="#b29877" points="317.85,-571.81 317.41,-561.23 311.16,-569.78 317.85,-571.81"></polygon>
</a>
</g>
<g id="a_edge11-label"><a xlink:title="github.com/ii64/gouring.(*IoUring).io_uring_wait_cqe -> github.com/ii64/gouring.(*IoUring).__io_uring_peek_cqe (7.38s)">
<text text-anchor="middle" x="329" y="-582.8" font-family="Times,serif" font-size="14.00"> 7.38s</text>
</a>
</g>
</g>
<!-- N7 -->
<g id="node7" class="node">
<title>N7</title>
<g id="a_node7"><a xlink:title="github.com/ii64/gouring.PrepRW (4.61s)">
<polygon fill="#edebe8" stroke="#b2a48d" points="543.5,-669.5 460.5,-669.5 460.5,-622.5 543.5,-622.5 543.5,-669.5"></polygon>
<text text-anchor="middle" x="502" y="-655.9" font-family="Times,serif" font-size="12.00">gouring</text>
<text text-anchor="middle" x="502" y="-642.9" font-family="Times,serif" font-size="12.00">PrepRW</text>
<text text-anchor="middle" x="502" y="-629.9" font-family="Times,serif" font-size="12.00">4.61s (4.14%)</text>
</a>
</g>
</g>
<!-- N8 -->
<g id="node8" class="node">
<title>N8</title>
<g id="a_node8"><a xlink:title="github.com/ii64/gouring.(*IoUring)._io_uring_get_sqe (3.69s)">
<polygon fill="#edebe9" stroke="#b2a794" points="104,-558.5 0,-558.5 0,-485.5 104,-485.5 104,-558.5"></polygon>
<text text-anchor="middle" x="52" y="-544.9" font-family="Times,serif" font-size="12.00">gouring</text>
<text text-anchor="middle" x="52" y="-531.9" font-family="Times,serif" font-size="12.00">(*IoUring)</text>
<text text-anchor="middle" x="52" y="-518.9" font-family="Times,serif" font-size="12.00">_io_uring_get_sqe</text>
<text text-anchor="middle" x="52" y="-505.9" font-family="Times,serif" font-size="12.00">3.22s (2.89%)</text>
<text text-anchor="middle" x="52" y="-492.9" font-family="Times,serif" font-size="12.00">of 3.69s (3.32%)</text>
</a>
</g>
</g>
<!-- N18 -->
<g id="node18" class="node">
<title>N18</title>
<g id="a_node18"><a xlink:title="github.com/ii64/gouring.(*IoUring).io_uring_get_sqe (3.69s)">
<polygon fill="#edebe9" stroke="#b2a794" points="97.5,-668 20.5,-668 20.5,-624 97.5,-624 97.5,-668"></polygon>
<text text-anchor="middle" x="59" y="-657.6" font-family="Times,serif" font-size="8.00">gouring</text>
<text text-anchor="middle" x="59" y="-648.6" font-family="Times,serif" font-size="8.00">(*IoUring)</text>
<text text-anchor="middle" x="59" y="-639.6" font-family="Times,serif" font-size="8.00">io_uring_get_sqe</text>
<text text-anchor="middle" x="59" y="-630.6" font-family="Times,serif" font-size="8.00">0 of 3.69s (3.32%)</text>
</a>
</g>
</g>
<!-- N10&#45;&gt;N18 -->
<g id="edge15" class="edge">
<title>N10-&gt;N18</title>
<g id="a_edge15"><a xlink:title="github.com/ii64/gouring.(*IoUring).GetSqe -> github.com/ii64/gouring.(*IoUring).io_uring_get_sqe (3.69s)">
<path fill="none" stroke="#b2a794" d="M72.73,-745.81C69.9,-725.43 66.19,-698.75 63.34,-678.26"></path>
<polygon fill="#b2a794" stroke="#b2a794" points="66.79,-677.59 61.94,-668.17 59.85,-678.55 66.79,-677.59"></polygon>
</a>
</g>
<g id="a_edge15-label"><a xlink:title="github.com/ii64/gouring.(*IoUring).GetSqe -> github.com/ii64/gouring.(*IoUring).io_uring_get_sqe (3.69s)">
<text text-anchor="middle" x="93" y="-716.8" font-family="Times,serif" font-size="14.00"> 3.69s</text>
<text text-anchor="middle" x="93" y="-701.8" font-family="Times,serif" font-size="14.00"> (inline)</text>
</a>
</g>
</g>
<!-- N11 -->
<g id="node11" class="node">
<title>N11</title>
<g id="a_node11"><a xlink:title="github.com/ii64/gouring.(*IoUring).io_uring_cq_advance (1s)">
<polygon fill="#edecec" stroke="#b2b0aa" points="520,-548 414,-548 414,-496 520,-496 520,-548"></polygon>
<text text-anchor="middle" x="467" y="-536" font-family="Times,serif" font-size="10.00">gouring</text>
<text text-anchor="middle" x="467" y="-525" font-family="Times,serif" font-size="10.00">(*IoUring)</text>
<text text-anchor="middle" x="467" y="-514" font-family="Times,serif" font-size="10.00">io_uring_cq_advance</text>
<text text-anchor="middle" x="467" y="-503" font-family="Times,serif" font-size="10.00">1s (0.9%)</text>
</a>
</g>
</g>
<!-- N12 -->
<g id="node12" class="node">
<title>N12</title>
<g id="a_node12"><a xlink:title="github.com/ii64/gouring.io_uring_enter2 (79.48s)">
<polygon fill="#edd7d5" stroke="#b21100" points="226,-211 140,-211 140,-163 226,-163 226,-211"></polygon>
<text text-anchor="middle" x="183" y="-199.8" font-family="Times,serif" font-size="9.00">gouring</text>
<text text-anchor="middle" x="183" y="-189.8" font-family="Times,serif" font-size="9.00">io_uring_enter2</text>
<text text-anchor="middle" x="183" y="-179.8" font-family="Times,serif" font-size="9.00">0.08s (0.072%)</text>
<text text-anchor="middle" x="183" y="-169.8" font-family="Times,serif" font-size="9.00">of 79.48s (71.46%)</text>
</a>
</g>
</g>
<!-- N12&#45;&gt;N2 -->
<g id="edge8" class="edge">
<title>N12-&gt;N2</title>
<g id="a_edge8"><a xlink:title="github.com/ii64/gouring.io_uring_enter2 -> syscall.Syscall6 (79.40s)">
<path fill="none" stroke="#b21100" stroke-width="4" d="M183,-162.94C183,-151.4 183,-136.79 183,-122.13"></path>
<polygon fill="#b21100" stroke="#b21100" stroke-width="4" points="186.5,-122.02 183,-112.02 179.5,-122.02 186.5,-122.02"></polygon>
</a>
</g>
<g id="a_edge8-label"><a xlink:title="github.com/ii64/gouring.io_uring_enter2 -> syscall.Syscall6 (79.40s)">
<text text-anchor="middle" x="203" y="-133.8" font-family="Times,serif" font-size="14.00"> 79.40s</text>
</a>
</g>
</g>
<!-- N13 -->
<g id="node13" class="node">
<title>N13</title>
<g id="a_node13"><a xlink:title="github.com/ii64/gouring.(*IoUring).io_uring_cqe_seen (1.15s)">
<polygon fill="#edeceb" stroke="#b2b0a9" points="442.5,-675 359.5,-675 359.5,-617 442.5,-617 442.5,-675"></polygon>
<text text-anchor="middle" x="401" y="-663.8" font-family="Times,serif" font-size="9.00">gouring</text>
<text text-anchor="middle" x="401" y="-653.8" font-family="Times,serif" font-size="9.00">(*IoUring)</text>
<text text-anchor="middle" x="401" y="-643.8" font-family="Times,serif" font-size="9.00">io_uring_cqe_seen</text>
<text text-anchor="middle" x="401" y="-633.8" font-family="Times,serif" font-size="9.00">0.15s (0.13%)</text>
<text text-anchor="middle" x="401" y="-623.8" font-family="Times,serif" font-size="9.00">of 1.15s (1.03%)</text>
</a>
</g>
</g>
<!-- N13&#45;&gt;N11 -->
<g id="edge20" class="edge">
<title>N13-&gt;N11</title>
<g id="a_edge20"><a xlink:title="github.com/ii64/gouring.(*IoUring).io_uring_cqe_seen -> github.com/ii64/gouring.(*IoUring).io_uring_cq_advance (1s)">
<path fill="none" stroke="#b2b0aa" d="M416.31,-616.7C425.93,-598.92 438.4,-575.87 448.56,-557.08"></path>
<polygon fill="#b2b0aa" stroke="#b2b0aa" points="451.66,-558.7 453.34,-548.24 445.51,-555.37 451.66,-558.7"></polygon>
</a>
</g>
<g id="a_edge20-label"><a xlink:title="github.com/ii64/gouring.(*IoUring).io_uring_cqe_seen -> github.com/ii64/gouring.(*IoUring).io_uring_cq_advance (1s)">
<text text-anchor="middle" x="444" y="-582.8" font-family="Times,serif" font-size="14.00"> 1s</text>
</a>
</g>
</g>
<!-- N19 -->
<g id="node19" class="node">
<title>N19</title>
<g id="a_node19"><a xlink:title="github.com/ii64/gouring.(*IoUring).io_uringn_submit (81.62s)">
<polygon fill="#edd7d5" stroke="#b20f00" points="225,-668 141,-668 141,-624 225,-624 225,-668"></polygon>
<text text-anchor="middle" x="183" y="-657.6" font-family="Times,serif" font-size="8.00">gouring</text>
<text text-anchor="middle" x="183" y="-648.6" font-family="Times,serif" font-size="8.00">(*IoUring)</text>
<text text-anchor="middle" x="183" y="-639.6" font-family="Times,serif" font-size="8.00">io_uringn_submit</text>
<text text-anchor="middle" x="183" y="-630.6" font-family="Times,serif" font-size="8.00">0 of 81.62s (73.38%)</text>
</a>
</g>
</g>
<!-- N14&#45;&gt;N19 -->
<g id="edge3" class="edge">
<title>N14-&gt;N19</title>
<g id="a_edge3"><a xlink:title="github.com/ii64/gouring.(*IoUring).Submit -> github.com/ii64/gouring.(*IoUring).io_uringn_submit (81.62s)">
<path fill="none" stroke="#b20f00" stroke-width="4" d="M183,-748.4C183,-727.78 183,-699.77 183,-678.41"></path>
<polygon fill="#b20f00" stroke="#b20f00" stroke-width="4" points="186.5,-678.23 183,-668.23 179.5,-678.23 186.5,-678.23"></polygon>
</a>
</g>
<g id="a_edge3-label"><a xlink:title="github.com/ii64/gouring.(*IoUring).Submit -> github.com/ii64/gouring.(*IoUring).io_uringn_submit (81.62s)">
<text text-anchor="middle" x="205" y="-716.8" font-family="Times,serif" font-size="14.00"> 81.62s</text>
<text text-anchor="middle" x="205" y="-701.8" font-family="Times,serif" font-size="14.00"> (inline)</text>
</a>
</g>
</g>
<!-- N15&#45;&gt;N6 -->
<g id="edge10" class="edge">
<title>N15-&gt;N6</title>
<g id="a_edge10"><a xlink:title="github.com/ii64/gouring.(*IoUring).WaitCqe -> github.com/ii64/gouring.(*IoUring).io_uring_wait_cqe (9.82s)">
<path fill="none" stroke="#b28c63" d="M287.3,-748.4C288.09,-731.38 289.11,-709.31 290,-690.11"></path>
<polygon fill="#b28c63" stroke="#b28c63" points="293.5,-690.24 290.47,-680.08 286.51,-689.91 293.5,-690.24"></polygon>
</a>
</g>
<g id="a_edge10-label"><a xlink:title="github.com/ii64/gouring.(*IoUring).WaitCqe -> github.com/ii64/gouring.(*IoUring).io_uring_wait_cqe (9.82s)">
<text text-anchor="middle" x="307" y="-709.3" font-family="Times,serif" font-size="14.00"> 9.82s</text>
</a>
</g>
</g>
<!-- N21 -->
<g id="node21" class="node">
<title>N21</title>
<g id="a_node21"><a xlink:title="github.com/ii64/gouring.io_uring_enter (79.48s)">
<polygon fill="#edd7d5" stroke="#b21100" points="225,-298 141,-298 141,-262 225,-262 225,-298"></polygon>
<text text-anchor="middle" x="183" y="-287.1" font-family="Times,serif" font-size="8.00">gouring</text>
<text text-anchor="middle" x="183" y="-278.1" font-family="Times,serif" font-size="8.00">io_uring_enter</text>
<text text-anchor="middle" x="183" y="-269.1" font-family="Times,serif" font-size="8.00">0 of 79.48s (71.46%)</text>
</a>
</g>
</g>
<!-- N16&#45;&gt;N21 -->
<g id="edge6" class="edge">
<title>N16-&gt;N21</title>
<g id="a_edge6"><a xlink:title="github.com/ii64/gouring.(*IoUring).__io_uring_submit -> github.com/ii64/gouring.io_uring_enter (79.48s)">
<path fill="none" stroke="#b21100" stroke-width="4" d="M183,-368.92C183,-350.42 183,-326.34 183,-308.05"></path>
<polygon fill="#b21100" stroke="#b21100" stroke-width="4" points="186.5,-308.04 183,-298.04 179.5,-308.04 186.5,-308.04"></polygon>
</a>
</g>
<g id="a_edge6-label"><a xlink:title="github.com/ii64/gouring.(*IoUring).__io_uring_submit -> github.com/ii64/gouring.io_uring_enter (79.48s)">
<text text-anchor="middle" x="205" y="-334.8" font-family="Times,serif" font-size="14.00"> 79.48s</text>
<text text-anchor="middle" x="205" y="-319.8" font-family="Times,serif" font-size="14.00"> (inline)</text>
</a>
</g>
</g>
<!-- N17&#45;&gt;N13 -->
<g id="edge19" class="edge">
<title>N17-&gt;N13</title>
<g id="a_edge19"><a xlink:title="github.com/ii64/gouring.(*IoUring).SeenCqe -> github.com/ii64/gouring.(*IoUring).io_uring_cqe_seen (1.15s)">
<path fill="none" stroke="#b2b0a9" d="M390.04,-748.4C392.04,-729.9 394.68,-705.46 396.87,-685.2"></path>
<polygon fill="#b2b0a9" stroke="#b2b0a9" points="400.37,-685.36 397.97,-675.04 393.41,-684.61 400.37,-685.36"></polygon>
</a>
</g>
<g id="a_edge19-label"><a xlink:title="github.com/ii64/gouring.(*IoUring).SeenCqe -> github.com/ii64/gouring.(*IoUring).io_uring_cqe_seen (1.15s)">
<text text-anchor="middle" x="418" y="-716.8" font-family="Times,serif" font-size="14.00"> 1.15s</text>
<text text-anchor="middle" x="418" y="-701.8" font-family="Times,serif" font-size="14.00"> (inline)</text>
</a>
</g>
</g>
<!-- N18&#45;&gt;N8 -->
<g id="edge16" class="edge">
<title>N18-&gt;N8</title>
<g id="a_edge16"><a xlink:title="github.com/ii64/gouring.(*IoUring).io_uring_get_sqe -> github.com/ii64/gouring.(*IoUring)._io_uring_get_sqe (3.69s)">
<path fill="none" stroke="#b2a794" d="M57.78,-623.75C56.91,-608.66 55.72,-587.82 54.64,-569"></path>
<polygon fill="#b2a794" stroke="#b2a794" points="58.12,-568.59 54.05,-558.81 51.13,-568.99 58.12,-568.59"></polygon>
</a>
</g>
<g id="a_edge16-label"><a xlink:title="github.com/ii64/gouring.(*IoUring).io_uring_get_sqe -> github.com/ii64/gouring.(*IoUring)._io_uring_get_sqe (3.69s)">
<text text-anchor="middle" x="73" y="-582.8" font-family="Times,serif" font-size="14.00"> 3.69s</text>
</a>
</g>
</g>
<!-- N19&#45;&gt;N5 -->
<g id="edge4" class="edge">
<title>N19-&gt;N5</title>
<g id="a_edge4"><a xlink:title="github.com/ii64/gouring.(*IoUring).io_uringn_submit -> github.com/ii64/gouring.(*IoUring).__io_uring_submit_and_wait (81.62s)">
<path fill="none" stroke="#b20f00" stroke-width="4" d="M183,-623.75C183,-606.58 183,-581.97 183,-561.37"></path>
<polygon fill="#b20f00" stroke="#b20f00" stroke-width="4" points="186.5,-561.32 183,-551.32 179.5,-561.32 186.5,-561.32"></polygon>
</a>
</g>
<g id="a_edge4-label"><a xlink:title="github.com/ii64/gouring.(*IoUring).io_uringn_submit -> github.com/ii64/gouring.(*IoUring).__io_uring_submit_and_wait (81.62s)">
<text text-anchor="middle" x="203" y="-582.8" font-family="Times,serif" font-size="14.00"> 81.62s</text>
</a>
</g>
</g>
<!-- N20&#45;&gt;N7 -->
<g id="edge12" class="edge">
<title>N20-&gt;N7</title>
<g id="a_edge12"><a xlink:title="github.com/ii64/gouring.PrepNop -> github.com/ii64/gouring.PrepRW (4.61s)">
<path fill="none" stroke="#b2a48d" d="M493.33,-759.3C494.88,-739.2 497.49,-705.45 499.44,-680.19"></path>
<polygon fill="#b2a48d" stroke="#b2a48d" points="502.95,-680.19 500.23,-669.95 495.97,-679.65 502.95,-680.19"></polygon>
</a>
</g>
<g id="a_edge12-label"><a xlink:title="github.com/ii64/gouring.PrepNop -> github.com/ii64/gouring.PrepRW (4.61s)">
<text text-anchor="middle" x="519" y="-716.8" font-family="Times,serif" font-size="14.00"> 4.61s</text>
<text text-anchor="middle" x="519" y="-701.8" font-family="Times,serif" font-size="14.00"> (inline)</text>
</a>
</g>
</g>
<!-- N21&#45;&gt;N12 -->
<g id="edge7" class="edge">
<title>N21-&gt;N12</title>
<g id="a_edge7"><a xlink:title="github.com/ii64/gouring.io_uring_enter -> github.com/ii64/gouring.io_uring_enter2 (79.48s)">
<path fill="none" stroke="#b21100" stroke-width="4" d="M183,-261.88C183,-250.48 183,-235.11 183,-221.34"></path>
<polygon fill="#b21100" stroke="#b21100" stroke-width="4" points="186.5,-221.22 183,-211.22 179.5,-221.22 186.5,-221.22"></polygon>
</a>
</g>
<g id="a_edge7-label"><a xlink:title="github.com/ii64/gouring.io_uring_enter -> github.com/ii64/gouring.io_uring_enter2 (79.48s)">
<text text-anchor="middle" x="203" y="-232.8" font-family="Times,serif" font-size="14.00"> 79.48s</text>
</a>
</g>
</g>
</g>
</svg>
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After

(image error) Size: 32 KiB

1041
assets/sqpoll.svg Normal file
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(image error) Size: 62 KiB

18
bench/perf/Makefile Normal file
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@ -0,0 +1,18 @@
alL: run
N := 10000000
PERF_OPTS := -n $(N) -noti 5000000
GCFLAGS := $(GCFLAGS)
#GCFLAGS += -m=2
#GCFLAGS += -l=4
build:
go build -gcflags="$(GCFLAGS)" .
run: build
./perf $(PERF_OPTS) -pprofCpu pprof-nonsqpoll.cpu
./perf -sqpoll $(PERF_OPTS) -pprofCpu pprof-sqpoll.cpu
pprof:
go tool pprof -http=:9001 $(P)

127
bench/perf/main.go Normal file
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@ -0,0 +1,127 @@
package main
import (
"flag"
"fmt"
"os"
"runtime"
"runtime/pprof"
"syscall"
"time"
"github.com/ii64/gouring"
)
var fs = flag.NewFlagSet("perf", flag.ExitOnError)
var (
entries uint
sqPoll bool
sqThreadCpu uint
sqThreadIdle uint
N uint
noti uint
pprofCpuFilename = "pprof.cpu"
)
func init() {
fs.UintVar(&entries, "entries", 256, "Entries")
fs.BoolVar(&sqPoll, "sqpoll", false, "Enable SQPOLL")
fs.UintVar(&sqThreadCpu, "sqthreadcpu", 16, "SQ Thread CPU")
fs.UintVar(&sqThreadIdle, "sqthreadidle", 10_000, "SQ Thread idle") // milliseconds
fs.UintVar(&N, "n", 10_000, "N times")
fs.UintVar(&noti, "noti", 10_000, "Notify per attempt N")
fs.StringVar(&pprofCpuFilename, "pprofCpu", pprofCpuFilename, "pprof cpu output file")
}
func main() {
err := fs.Parse(os.Args[1:])
if err != nil {
panic(err)
}
// check entries size
if entries > uint(^uint32(0)) {
panic("entries overflow.")
}
params := &gouring.IoUringParams{}
if sqPoll {
params.Flags |= gouring.IORING_SETUP_SQPOLL
params.SqThreadCpu = uint32(sqThreadCpu)
params.SqThreadIdle = uint32(sqThreadIdle)
}
h, err := gouring.NewWithParams(uint32(entries), params)
if err != nil {
panic(err)
}
defer h.Close()
f, err := os.Create(pprofCpuFilename)
if err != nil {
panic(err)
}
fmt.Println("performing...")
pprof.StartCPUProfile(f)
defer pprof.StopCPUProfile()
var i, j uint
var sqe *gouring.IoUringSqe
var cqe *gouring.IoUringCqe
var submitted int
startTime := time.Now()
for i = 0; i < N; i++ {
if i%noti == 0 { // notify
fmt.Printf("n:%d e:%s\n", j, time.Now().Sub(startTime))
}
for j = 0; j < entries; j++ {
for {
// sqe could be nil if SQ is already full so we spin until we got one
sqe = h.GetSqe()
if sqe != nil {
break
}
runtime.Gosched()
}
gouring.PrepNop(sqe)
sqe.UserData.SetUint64(uint64(i + j))
}
submitted, err = h.Submit()
if err != nil {
panic(err)
}
if i%noti == 0 { // notify
fmt.Printf(" >> submitted %d\n", submitted)
}
for j = 0; j < entries; j++ {
err = h.WaitCqe(&cqe)
if err == syscall.EINTR {
continue
}
if err != nil {
panic(err)
}
if cqe == nil {
panic("cqe is nil!")
}
if cqe.Res < 0 {
panic(syscall.Errno(-cqe.Res))
}
h.SeenCqe(cqe)
}
}
_ = submitted
_ = err
}

229
const_value.go
View file

@ -1,229 +0,0 @@
package gouring
type UringSQEFlag = uint8
const (
IOSQE_FIXED_FILE_BIT = iota
IOSQE_IO_DRAIN_BIT
IOSQE_IO_LINK_BIT
IOSQE_TO_HARDLINK_BIT
IOSQE_ASYNC_BIT
IOSQE_BUFFER_SELECT_BIT
IOSQE_CQE_SKIP_BIT
)
const (
IOSQE_FIXED_FILE UringSQEFlag = 1 << IOSQE_FIXED_FILE_BIT
IOSQE_IO_DRAIN UringSQEFlag = 1 << IOSQE_IO_DRAIN_BIT
IOSQE_IO_LINK UringSQEFlag = 1 << IOSQE_IO_LINK_BIT
IOSQE_TO_HARDLINK UringSQEFlag = 1 << IOSQE_TO_HARDLINK_BIT
IOSQE_ASYNC UringSQEFlag = 1 << IOSQE_ASYNC_BIT
IOSQE_BUFFER_SELECT UringSQEFlag = 1 << IOSQE_BUFFER_SELECT_BIT
IOSQE_CQE_SKIP_SUCCESS UringSQEFlag = 1 << IOSQE_CQE_SKIP_BIT
)
//
// io_uring_setup() flags
type UringSetupFlag = uint32
const (
IORING_SETUP_IOPOLL UringSetupFlag = 1 << iota
IORING_SETUP_SQPOLL
IORING_SETUP_SQ_AFF
IORING_SETUP_SQSIZE
IORING_SETUP_CLAMP
IORING_SETUP_ATTACH_WQ
IORING_SETUP_R_DISABLED
)
//
// uring op code
type UringOpcode = uint8
const (
IORING_OP_NOP UringOpcode = iota
IORING_OP_READV
IORING_OP_WRITEV
IORING_OP_FSYNC
IORING_OP_READ_FIXED
IORING_OP_WRITE_FIXED
IORING_OP_POLL_ADD
IORING_OP_POLL_REMOVE
IORING_OP_SYNC_FILE_RANGE
IORING_OP_SENDMSG
IORING_OP_RECVMSG
IORING_OP_TIMEOUT
IORING_OP_TIMEOUT_REMOVE
IORING_OP_ACCEPT
IORING_OP_ASYNC_CANCEL
IORING_OP_LINK_TIMEOUT
IORING_OP_CONNECT
IORING_OP_FALLOCATE
IORING_OP_OPENAT
IORING_OP_CLOSE
IORING_OP_FILES_UPDATE
IORING_OP_STATX
IORING_OP_READ
IORING_OP_WRITE
IORING_OP_FADVISE
IORING_OP_MADVISE
IORING_OP_SEND
IORING_OP_RECV
IORING_OP_OPENAT2
IORING_OP_EPOLL_CTL
IORING_OP_SPLICE
IORING_OP_PROVIDE_BUFFERS
IORING_OP_REMOVE_BUFFERS
IORING_OP_TEE
IORING_OP_SHUTDOWN
IORING_OP_RENAMEAT
IORING_OP_UNLINKAT
IORING_OP_MKDIRAT
IORING_OP_SYMLINKAT
IORING_OP_LINKAT
/* this goes last, obviously */
IORING_OP_LAST
)
// sqe->fsync_flags
const IORING_FSYNC_DATASYNC uint32 = 1 << 0
// sqe->timeout_flags
const IORING_TIMEOUT_ABS uint32 = 1 << 0
// sqe->splice_flags
// extends splice(2) flags
const SPLICE_F_FD_IN_FIXED uint32 = 1 << 31
//
// cqe->flags
type UringCQEFlag = uint32
const IORING_CQE_F_BUFFER UringCQEFlag = 1 << 8
const IORING_CQE_BUFFER_SHIFT UringCQEFlag = 16
//
// Magic offsets for the application to mmap the data it needs
type UringOffset = int64
const (
IORING_OFF_SQ_RING UringOffset = 0
IORING_OFF_CQ_RING UringOffset = 0x8000000
IORING_OFF_SQES UringOffset = 0x10000000
)
//
// sq_ring->flags
type UringSQ = uint32
const (
IORING_SQ_NEED_WAKEUP UringSQ = 1 << iota // needs io_uring_enter wakeup
IORING_SQ_CQ_OVERFLOW // CQ Ring is overflow
)
//
// cq_ring->flags
type UringCQ = uint32
const IORING_CQ_EVENTFD_DISABLED = 1 << 0
//
// io_uring_enter(2) flag
type UringEnterFlag = uint32
const (
IORING_ENTER_GETEVENTS UringEnterFlag = 1 << iota
IORING_ENTER_SQ_WAKEUP
IORING_ENTER_SQ_WAIT
IORING_ENTER_EXT_ARG
)
//
// io_uring_params->features flags
type UringParamFeatureFlag = uint32
const (
IORING_FEAT_SINGLE_MMAP UringParamFeatureFlag = 1 << iota
IORING_FEAT_NODROP
IORING_FEAT_SUBMIT_STABLE
IORING_FEAT_RW_CUR_POS
IORING_FEAT_CUR_PERSONALITY
IORING_FEAT_FAST_POLL
IORING_FEAT_POLL_32BITS
IORING_FEAT_SQPOLL_NONFIXED
IORING_FEAT_EXT_ARG
IORING_FEAT_NATIVE_WORKERS
IORING_FEAT_RSRC_TAGS
IORING_FEAT_CQE_SKIP
)
//
type UringRegisterOpcode = uint
const (
IORING_REGISTER_BUFFERS UringRegisterOpcode = iota
IORING_UREGISTER_BUFFERS
IORING_REGISTER_FILES
IORING_UNREGISTER_FILES
IORING_REGISTER_EVENTFD
IORING_UNREGISTER_EVENTFD
IORING_REGISTER_FILES_UPDATE
IORING_REGISTER_EVENTFD_ASYNC
IORING_REGISTER_PROBE
IORING_REGISTER_PERSONALITY
IORING_UNREGISTER_PERSONALITY
IORING_REGISTER_RESTRICTIONS
IORING_REGISTER_ENABLE_RINGS
/* extended with tagging */
IORING_REGISTER_FILES2
IORING_REGISTER_FILES_UPDATE2
IORING_REGISTER_BUFFERS2
IORING_REGISTER_BUFFERS_UPDATE
/* set/clear io-wq thread affinities */
IORING_REGISTER_IOWQ_AFF
IORING_UNREGISTER_IOWQ_AFF
/* set/get max number of io-wq affinities */
IORING_REGISTER_IOWQ_MAX_WORKERS
// BPF soon
//
/* this goes last */
IORING_REGISTER_LAST
)
//
const IO_URING_OP_SUPPORTED = 1 << 0
//
// io_uring_restriction->opcode values
type UringRestrictionOpcode = uint32
const (
IORING_RESTRICTION_REGISTER_OP UringRestrictionOpcode = iota
IORING_RESTRICTION_SQE_OP
IORING_RESTRICTION_SQE_FLAGS_ALLOWED
IORINGN_RESTRICTION_SQE_FLAGS_REQUIRED
IORING_RESTRICTION_LAST
)

70
core.go
View file

@ -1,70 +0,0 @@
package gouring
import (
"syscall"
"github.com/pkg/errors"
)
func New(entries uint, params *IOUringParams) (*Ring, error) {
r := &Ring{}
if params != nil {
r.params = *params
}
var err error
if r.fd, err = setup(r, entries, &r.params); err != nil {
err = errors.Wrap(err, "setup")
return nil, err
}
return r, nil
}
func (r *Ring) Close() (err error) {
if err = unsetup(r); err != nil {
err = errors.Wrap(err, "close")
return
}
if err = syscall.Close(r.fd); err != nil {
err = errors.Wrap(err, "close")
return
}
// tbd..
return
}
func (r *Ring) Register(opcode UringRegisterOpcode, arg uintptr, nrArg uint) (ret int, err error) {
ret, err = register(r, opcode, arg, nrArg)
if err != nil {
err = errors.Wrap(err, "register")
return
}
return
}
func (r *Ring) Enter(toSubmit, minComplete uint, flags UringEnterFlag, sig *Sigset_t) (ret int, err error) {
ret, err = enter(r, toSubmit, minComplete, flags, sig)
if err != nil {
err = errors.Wrap(err, "enter")
return
}
return
}
//
func (r *Ring) Params() *IOUringParams {
return &r.params
}
func (r *Ring) Fd() int {
return r.fd
}
func (r *Ring) SQ() *SQRing {
return &r.sq
}
func (r *Ring) CQ() *CQRing {
return &r.cq
}

60
core_test.go
View file

@ -1,60 +0,0 @@
package gouring
import (
"strings"
"syscall"
"testing"
"github.com/stretchr/testify/assert"
)
func TestCore(t *testing.T) {
ring, err := New(256, nil)
assert.NoError(t, err, "create ring")
defer func() {
err := ring.Close()
assert.NoError(t, err, "close ring")
}()
mkdata := func(i int) []byte {
return []byte("print me to stdout please" + strings.Repeat("!", i) + "\n")
}
sq := ring.SQ()
n := 5
for i := 0; i < n; i++ {
sqTail := *sq.Tail()
sqIdx := sqTail & *sq.RingMask()
sqe := sq.Get(sqIdx)
m := mkdata(i)
sqe.Opcode = IORING_OP_WRITE
sqe.Fd = int32(syscall.Stdout)
sqe.UserData = uint64(i)
sqe.Len = uint32(len(m))
sqe.SetOffset(0)
sqe.SetAddr(&m[0])
*sq.Array().Get(sqIdx) = *sq.Head() & *sq.RingMask()
*sq.Tail()++
done, err := ring.Enter(1, 1, IORING_ENTER_GETEVENTS, nil)
assert.NoError(t, err, "ring enter")
t.Logf("done %d", done)
}
// get cq
cq := ring.CQ()
for i := 0; i < int(*cq.Tail()); i++ {
cqHead := *cq.Head()
cqIdx := cqHead & *cq.RingMask()
cqe := cq.Get(cqIdx)
*cq.Head()++
t.Logf("CQE %+#v", cqe)
}
}

5
go.mod
View file

@ -2,10 +2,7 @@ module github.com/ii64/gouring
go 1.18 go 1.18
require ( require github.com/stretchr/testify v1.7.0
github.com/pkg/errors v0.9.1
github.com/stretchr/testify v1.7.0
)
require ( require (
github.com/davecgh/go-spew v1.1.0 // indirect github.com/davecgh/go-spew v1.1.0 // indirect

2
go.sum
View file

@ -1,7 +1,5 @@
github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8= github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM= github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME= github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=

635
hdr.go Normal file
View file

@ -0,0 +1,635 @@
/* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) OR MIT */
/*
* Header file for the io_uring interface.
*
* Copyright (C) 2019 Jens Axboe
* Copyright (C) 2019 Christoph Hellwig
*/
package gouring
import "unsafe"
/*
* IO submission data structure (Submission Queue Entry)
*/
type IoUringSqe_Union1 uint64
func (u *IoUringSqe_Union1) SetOffset(v uint64) { *u = IoUringSqe_Union1(v) }
func (u *IoUringSqe_Union1) SetAddr2(v uint64) { *u = IoUringSqe_Union1(v) }
type IoUringSqe_Union2 uint64
func (u *IoUringSqe_Union2) SetAddr_Value(v uint64) { *u = IoUringSqe_Union2(v) }
func (u *IoUringSqe_Union2) SetAddr(v unsafe.Pointer) { *u = IoUringSqe_Union2((uintptr)(v)) }
func (u *IoUringSqe_Union2) SetSpliceOffsetIn(v uint64) { *u = IoUringSqe_Union2(v) }
type IoUringSqe_Union3 uint32
func (u *IoUringSqe_Union3) SetRwFlags(v uint32) { *u = IoUringSqe_Union3(v) }
func (u *IoUringSqe_Union3) SetPollEvents(v uint16) { *u = IoUringSqe_Union3(v) }
func (u *IoUringSqe_Union3) SetPoll32Events(v uint32) { *u = IoUringSqe_Union3(v) }
func (u *IoUringSqe_Union3) SetSyncRangeFlags(v uint32) { *u = IoUringSqe_Union3(v) }
func (u *IoUringSqe_Union3) SetMsgFlags(v uint32) { *u = IoUringSqe_Union3(v) }
func (u *IoUringSqe_Union3) SetTimeoutFlags(v uint32) { *u = IoUringSqe_Union3(v) }
func (u *IoUringSqe_Union3) SetAcceptFlags(v uint32) { *u = IoUringSqe_Union3(v) }
func (u *IoUringSqe_Union3) SetCancelFlags(v uint32) { *u = IoUringSqe_Union3(v) }
func (u *IoUringSqe_Union3) SetOpenFlags(v uint32) { *u = IoUringSqe_Union3(v) }
func (u *IoUringSqe_Union3) SetStatxFlags(v uint32) { *u = IoUringSqe_Union3(v) }
func (u *IoUringSqe_Union3) SetFadviseAdvice(v uint32) { *u = IoUringSqe_Union3(v) }
func (u *IoUringSqe_Union3) SetSpliceFlags(v uint32) { *u = IoUringSqe_Union3(v) }
func (u *IoUringSqe_Union3) SetRenameFlags(v uint32) { *u = IoUringSqe_Union3(v) }
func (u *IoUringSqe_Union3) SetUnlinkFlags(v uint32) { *u = IoUringSqe_Union3(v) }
func (u *IoUringSqe_Union3) SetHardlinkFlags(v uint32) { *u = IoUringSqe_Union3(v) }
func (u *IoUringSqe_Union3) SetXattrFlags(v uint32) { *u = IoUringSqe_Union3(v) }
func (u *IoUringSqe_Union3) SetOpFlags(v uint32) { *u = IoUringSqe_Union3(v) } //generic
func (u IoUringSqe_Union3) GetOpFlags() uint32 { return uint32(u) } //generic
type IoUringSqe_Union4 uint16
func (u *IoUringSqe_Union4) SetBufIndex(v uint16) { *u = IoUringSqe_Union4(v) }
func (u *IoUringSqe_Union4) SetBufGroup(v uint16) { *u = IoUringSqe_Union4(v) }
type IoUringSqe_Union5 uint32
func (u *IoUringSqe_Union5) SetSpliceFdIn(v int32) { *u = IoUringSqe_Union5(v) }
func (u *IoUringSqe_Union5) SetFileIndex(v uint32) { *u = IoUringSqe_Union5(v) }
type IoUringSqe struct {
Opcode IoUringOp /* type of operation for this sqe */
Flags uint8 /* IOSQE_ flags */
IoPrio uint16 /* ioprio for the request */
Fd int32 /* file descriptor to do IO on */
// union {
// __u64 off; /* offset into file */
// __u64 addr2;
// };
IoUringSqe_Union1
// union {
// __u64 addr; /* pointer to buffer or iovecs */
// __u64 splice_off_in;
// };
IoUringSqe_Union2
Len uint32 /* buffer size or number of iovecs */
// union {
// __kernel_rwf_t rw_flags;
// __u32 fsync_flags;
// __u16 poll_events; /* compatibility */
// __u32 poll32_events; /* word-reversed for BE */
// __u32 sync_range_flags;
// __u32 msg_flags;
// __u32 timeout_flags;
// __u32 accept_flags;
// __u32 cancel_flags;
// __u32 open_flags;
// __u32 statx_flags;
// __u32 fadvise_advice;
// __u32 splice_flags;
// __u32 rename_flags;
// __u32 unlink_flags;
// __u32 hardlink_flags;
// __u32 xattr_flags;
// };
IoUringSqe_Union3
UserData UserData /* data to be passed back at completion time */
/* pack this to avoid bogus arm OABI complaints */
// union {
// /* index into fixed buffers, if used */
// __u16 buf_index;
// /* for grouped buffer selection */
// __u16 buf_group;
// } __attribute__((packed));
IoUringSqe_Union4
/* personality to use, if used */
Personality uint16
// union {
// __s32 splice_fd_in;
// __u32 file_index;
// };
IoUringSqe_Union5
Addr3 uint64
__pad2 [1]uint64
}
/*
* If sqe->file_index is set to this for opcodes that instantiate a new
* direct descriptor (like openat/openat2/accept), then io_uring will allocate
* an available direct descriptor instead of having the application pass one
* in. The picked direct descriptor will be returned in cqe->res, or -ENFILE
* if the space is full.
*/
const IORING_FILE_INDEX_ALLOC = ^uint32(0)
const (
IOSQE_FIXED_FILE_BIT = iota
IOSQE_IO_DRAIN_BIT
IOSQE_IO_LINK_BIT
IOSQE_IO_HARDLINK_BIT
IOSQE_ASYNC_BIT
IOSQE_BUFFER_SELECT_BIT
IOSQE_CQE_SKIP_SUCCESS_BIT
)
/*
* sqe->flags
*/
const (
/* use fixed fileset */
IOSQE_FIXED_FILE = (1 << IOSQE_FIXED_FILE_BIT)
/* issue after inflight IO */
IOSQE_IO_DRAIN = (1 << IOSQE_IO_DRAIN_BIT)
/* links next sqe */
IOSQE_IO_LINK = (1 << IOSQE_IO_LINK_BIT)
/* like LINK, but stronger */
IOSQE_IO_HARDLINK = (1 << IOSQE_IO_HARDLINK_BIT)
/* always go async */
IOSQE_ASYNC = (1 << IOSQE_ASYNC_BIT)
/* select buffer from sqe->buf_group */
IOSQE_BUFFER_SELECT = (1 << IOSQE_BUFFER_SELECT_BIT)
/* don't post CQE if request succeeded */
IOSQE_CQE_SKIP_SUCCESS = (1 << IOSQE_CQE_SKIP_SUCCESS_BIT)
)
/*
* io_uring_setup() flags
*/
const (
IORING_SETUP_IOPOLL = (1 << 0) /* io_context is polled */
IORING_SETUP_SQPOLL = (1 << 1) /* SQ poll thread */
IORING_SETUP_SQ_AFF = (1 << 2) /* sq_thread_cpu is valid */
IORING_SETUP_CQSIZE = (1 << 3) /* app defines CQ size */
IORING_SETUP_CLAMP = (1 << 4) /* clamp SQ/CQ ring sizes */
IORING_SETUP_ATTACH_WQ = (1 << 5) /* attach to existing wq */
IORING_SETUP_R_DISABLED = (1 << 6) /* start with ring disabled */
IORING_SETUP_SUBMIT_ALL = (1 << 7) /* continue submit on error */
)
/*
* Cooperative task running. When requests complete, they often require
* forcing the submitter to transition to the kernel to complete. If this
* flag is set, work will be done when the task transitions anyway, rather
* than force an inter-processor interrupt reschedule. This avoids interrupting
* a task running in userspace, and saves an IPI.
*/
const IORING_SETUP_COOP_TASKRUN = (1 << 8)
/*
* If COOP_TASKRUN is set, get notified if task work is available for
* running and a kernel transition would be needed to run it. This sets
* IORING_SQ_TASKRUN in the sq ring flags. Not valid with COOP_TASKRUN.
*/
const IORING_SETUP_TASKRUN_FLAG = (1 << 9)
const IORING_SETUP_SQE128 = (1 << 10) /* SQEs are 128 byte */
const IORING_SETUP_CQE32 = (1 << 11) /* CQEs are 32 byte */
type IoUringOp = uint8
//go:generate stringerx -type=IoUringOp
const (
IORING_OP_NOP IoUringOp = iota
IORING_OP_READV
IORING_OP_WRITEV
IORING_OP_FSYNC
IORING_OP_READ_FIXED
IORING_OP_WRITE_FIXED
IORING_OP_POLL_ADD
IORING_OP_POLL_REMOVE
IORING_OP_SYNC_FILE_RANGE
IORING_OP_SENDMSG
IORING_OP_RECVMSG
IORING_OP_TIMEOUT
IORING_OP_TIMEOUT_REMOVE
IORING_OP_ACCEPT
IORING_OP_ASYNC_CANCEL
IORING_OP_LINK_TIMEOUT
IORING_OP_CONNECT
IORING_OP_FALLOCATE
IORING_OP_OPENAT
IORING_OP_CLOSE
IORING_OP_FILES_UPDATE
IORING_OP_STATX
IORING_OP_READ
IORING_OP_WRITE
IORING_OP_FADVISE
IORING_OP_MADVISE
IORING_OP_SEND
IORING_OP_RECV
IORING_OP_OPENAT2
IORING_OP_EPOLL_CTL
IORING_OP_SPLICE
IORING_OP_PROVIDE_BUFFERS
IORING_OP_REMOVE_BUFFERS
IORING_OP_TEE
IORING_OP_SHUTDOWN
IORING_OP_RENAMEAT
IORING_OP_UNLINKAT
IORING_OP_MKDIRAT
IORING_OP_SYMLINKAT
IORING_OP_LINKAT
IORING_OP_MSG_RING
IORING_OP_FSETXATTR
IORING_OP_SETXATTR
IORING_OP_FGETXATTR
IORING_OP_GETXATTR
IORING_OP_SOCKET
IORING_OP_URING_CMD
/* this goes last, obviously */
IORING_OP_LAST
)
/*
* sqe->fsync_flags
*/
const IORING_FSYNC_DATASYNC = (1 << 0)
/*
* sqe->timeout_flags
*/
const (
IORING_TIMEOUT_ABS = (1 << 0)
IORING_TIMEOUT_UPDATE = (1 << 1)
IORING_TIMEOUT_BOOTTIME = (1 << 2)
IORING_TIMEOUT_REALTIME = (1 << 3)
IORING_LINK_TIMEOUT_UPDATE = (1 << 4)
IORING_TIMEOUT_ETIME_SUCCESS = (1 << 5)
IORING_TIMEOUT_CLOCK_MASK = (IORING_TIMEOUT_BOOTTIME | IORING_TIMEOUT_REALTIME)
IORING_TIMEOUT_UPDATE_MASK = (IORING_TIMEOUT_UPDATE | IORING_LINK_TIMEOUT_UPDATE)
)
/*
* sqe->splice_flags
* extends splice(2) flags
*/
const SPLICE_F_FD_IN_FIXED = (1 << 31) /* the last bit of __u32 */
/*
* POLL_ADD flags. Note that since sqe->poll_events is the flag space, the
* command flags for POLL_ADD are stored in sqe->len.
*
* IORING_POLL_ADD_MULTI Multishot poll. Sets IORING_CQE_F_MORE if
* the poll handler will continue to report
* CQEs on behalf of the same SQE.
*
* IORING_POLL_UPDATE Update existing poll request, matching
* sqe->addr as the old user_data field.
*/
const (
IORING_POLL_ADD_MULTI = (1 << 0)
IORING_POLL_UPDATE_EVENTS = (1 << 1)
IORING_POLL_UPDATE_USER_DATA = (1 << 2)
)
/*
* ASYNC_CANCEL flags.
*
* IORING_ASYNC_CANCEL_ALL Cancel all requests that match the given key
* IORING_ASYNC_CANCEL_FD Key off 'fd' for cancelation rather than the
* request 'user_data'
* IORING_ASYNC_CANCEL_ANY Match any request
*/
const (
IORING_ASYNC_CANCEL_ALL = (1 << 0)
IORING_ASYNC_CANCEL_FD = (1 << 1)
IORING_ASYNC_CANCEL_ANY = (1 << 2)
)
/*
* send/sendmsg and recv/recvmsg flags (sqe->addr2)
*
* IORING_RECVSEND_POLL_FIRST If set, instead of first attempting to send
* or receive and arm poll if that yields an
* -EAGAIN result, arm poll upfront and skip
* the initial transfer attempt.
*/
const IORING_RECVSEND_POLL_FIRST = (1 << 0)
/*
* accept flags stored in sqe->ioprio
*/
const IORING_ACCEPT_MULTISHOT = (1 << 0)
/*
* IO completion data structure (Completion Queue Entry)
*/
type IoUringCqe struct {
UserData UserData /* sqe->data submission passed back */
Res int32 /* result code for this event */
Flags uint32
/*
* If the ring is initialized with IORING_SETUP_CQE32, then this field
* contains 16-bytes of padding, doubling the size of the CQE.
*/
// __u64 big_cqe[];
// 8+4+4 == 16 , correct
}
/*
* cqe->flags
*
* IORING_CQE_F_BUFFER If set, the upper 16 bits are the buffer ID
* IORING_CQE_F_MORE If set, parent SQE will generate more CQE entries
* IORING_CQE_F_SOCK_NONEMPTY If set, more data to read after socket recv
*/
const (
IORING_CQE_F_BUFFER = (1 << 0)
IORING_CQE_F_MORE = (1 << 1)
IORING_CQE_F_SOCK_NONEMPTY = (1 << 2)
)
const (
IORING_CQE_BUFFER_SHIFT = 16
)
/*
* Magic offsets for the application to mmap the data it needs
*/
const (
IORING_OFF_SQ_RING = 0
IORING_OFF_CQ_RING = 0x8000000
IORING_OFF_SQES = 0x10000000
)
/*
* Filled with the offset for mmap(2)
*/
type IoSqringOffsets struct {
Head uint32
Tail uint32
RingMask uint32
RingEntries uint32
Flags uint32
Dropped uint32
Array uint32
resv1 uint32
resv2 uint64
}
/*
* sq_ring->flags
*/
const (
IORING_SQ_NEED_WAKEUP = (1 << 0) /* needs io_uring_enter wakeup */
IORING_SQ_CQ_OVERFLOW = (1 << 1) /* CQ ring is overflown */
IORING_SQ_TASKRUN = (1 << 2) /* task should enter the kernel */
)
type IoCqringOffsets struct {
Head uint32
Tail uint32
RingMask uint32
RingEntries uint32
Overflow uint32
Cqes uint32
Flags uint32
resv1 uint32
resv2 uint64
}
/*
* cq_ring->flags
*/
/* disable eventfd notifications */
const IORING_CQ_EVENTFD_DISABLED = (1 << 0)
/*
* io_uring_enter(2) flags
*/
const (
IORING_ENTER_GETEVENTS = (1 << 0)
IORING_ENTER_SQ_WAKEUP = (1 << 1)
IORING_ENTER_SQ_WAIT = (1 << 2)
IORING_ENTER_EXT_ARG = (1 << 3)
IORING_ENTER_REGISTERED_RING = (1 << 4)
)
/*
* Passed in for io_uring_setup(2). Copied back with updated info on success
*/
type IoUringParams struct {
SqEntries uint32
CqEntries uint32
Flags uint32
SqThreadCpu uint32
SqThreadIdle uint32
Features uint32
WqFd uint32
resv [3]uint32
SqOff IoSqringOffsets
CqOff IoCqringOffsets
}
/*
* io_uring_params->features flags
*/
const (
IORING_FEAT_SINGLE_MMAP = (1 << 0)
IORING_FEAT_NODROP = (1 << 1)
IORING_FEAT_SUBMIT_STABLE = (1 << 2)
IORING_FEAT_RW_CUR_POS = (1 << 3)
IORING_FEAT_CUR_PERSONALITY = (1 << 4)
IORING_FEAT_FAST_POLL = (1 << 5)
IORING_FEAT_POLL_32BITS = (1 << 6)
IORING_FEAT_SQPOLL_NONFIXED = (1 << 7)
IORING_FEAT_EXT_ARG = (1 << 8)
IORING_FEAT_NATIVE_WORKERS = (1 << 9)
IORING_FEAT_RSRC_TAGS = (1 << 10)
IORING_FEAT_CQE_SKIP = (1 << 11)
IORING_FEAT_LINKED_FILE = (1 << 12)
)
/*
* io_uring_register(2) opcodes and arguments
*/
const (
IORING_REGISTER_BUFFERS = 0
IORING_UNREGISTER_BUFFERS = 1
IORING_REGISTER_FILES = 2
IORING_UNREGISTER_FILES = 3
IORING_REGISTER_EVENTFD = 4
IORING_UNREGISTER_EVENTFD = 5
IORING_REGISTER_FILES_UPDATE = 6
IORING_REGISTER_EVENTFD_ASYNC = 7
IORING_REGISTER_PROBE = 8
IORING_REGISTER_PERSONALITY = 9
IORING_UNREGISTER_PERSONALITY = 10
IORING_REGISTER_RESTRICTIONS = 11
IORING_REGISTER_ENABLE_RINGS = 12
/* extended with tagging */
IORING_REGISTER_FILES2 = 13
IORING_REGISTER_FILES_UPDATE2 = 14
IORING_REGISTER_BUFFERS2 = 15
IORING_REGISTER_BUFFERS_UPDATE = 16
/* set/clear io-wq thread affinities */
IORING_REGISTER_IOWQ_AFF = 17
IORING_UNREGISTER_IOWQ_AFF = 18
/* set/get max number of io-wq workers */
IORING_REGISTER_IOWQ_MAX_WORKERS = 19
/* register/unregister io_uring fd with the ring */
IORING_REGISTER_RING_FDS = 20
IORING_UNREGISTER_RING_FDS = 21
/* register ring based provide buffer group */
IORING_REGISTER_PBUF_RING = 22
IORING_UNREGISTER_PBUF_RING = 23
/* this goes last */
IORING_REGISTER_LAST
)
/* io-wq worker categories */
const (
IO_WQ_BOUND = iota
IO_WQ_UNBOUND
)
/* deprecated, see struct IoUringRsrcUpdate */
type IoUringFilesUpdate struct {
Offset uint32
resv uint32
Fds uint64 // __aligned_u64/* __s32 * */
}
/*
* Register a fully sparse file space, rather than pass in an array of all
* -1 file descriptors.
*/
const IORING_RSRC_REGISTER_SPARSE = (1 << 0)
type IoUringRsrcRegister struct {
Nr uint32
Flags uint32
resv2 uint64
Data uint64 // __aligned_u64
Tags uint64 // __aligned_u64
}
type IoUringRsrcUpdate struct {
Offset uint32
resv uint32
Data uint64 // __aligned_u64
}
type IoUringRsrcUpdate2 struct {
Offset uint32
resv uint32
Data uint64 // __aligned_u64
Tags uint64 // __aligned_u64
Nr uint32
resv2 uint32
}
/* Skip updating fd indexes set to this value in the fd table */
const IORING_REGISTER_FILES_SKIP = (-2)
const IO_URING_OP_SUPPORTED = (1 << 0)
type IoUringProbeOp struct {
op uint8
resv uint8
flags uint16 /* IO_URING_OP_* flags */
resv2 uint32
}
type IoUringProbe struct {
last_op uint8 /* last opcode supported */
uint8 /* length of ops[] array below */
resv uint16
resv2 [3]uint32
ops [0]IoUringProbeOp
}
type IoUringRestriction struct {
opcode uint16
// union {
// __u8 register_op; /* IORING_RESTRICTION_REGISTER_OP */
// __u8 sqe_op; /* IORING_RESTRICTION_SQE_OP */
// __u8 sqe_flags; /* IORING_RESTRICTION_SQE_FLAGS_* */
// };
Union1 uint8
resv uint8
resv2 [3]uint32
}
type IoUringBuf struct {
Addr uint64
Len uint32
Bid uint16
resv uint16
}
type IoUringBufRing struct {
// union {
/*
* To avoid spilling into more pages than we need to, the
* ring tail is overlaid with the IoUringBuf->resv field.
*/
Anon0 struct {
resv1 uint64
resv2 uint32
resv3 uint16
Tail uint16
}
// bufs [0]IoUringBuf
// };
}
/* argument for IORING_(UN)REGISTER_PBUF_RING */
type IoUringBufReg struct {
RingAddr uint64
RingEntries uint32
Bgid uint16
Pad uint16
resv [3]uint64
}
/*
* IoUringRestriction->opcode values
*/
const (
/* Allow an io_uring_register(2) opcode */
IORING_RESTRICTION_REGISTER_OP = 0
/* Allow an sqe opcode */
IORING_RESTRICTION_SQE_OP = 1
/* Allow sqe flags */
IORING_RESTRICTION_SQE_FLAGS_ALLOWED = 2
/* Require sqe flags (these flags must be set on each submission) */
IORING_RESTRICTION_SQE_FLAGS_REQUIRED = 3
IORING_RESTRICTION_LAST
)
type IoUringGeteventsArg struct {
Sigmask uint64
SigmaskSz uint32
Pad uint32
Ts uint64
}
/*
* accept flags stored in sqe->ioprio
*/
// const IORING_ACCEPT_MULTISHOT = (1 << 0)

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package gouring
const INT_FLAG_REG_RING uint8 = 1

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package gouring
import "unsafe"
const (
SizeofUnsigned = unsafe.Sizeof(uint32(0))
SizeofUint32 = unsafe.Sizeof(uint32(0))
SizeofIoUringSqe = unsafe.Sizeof(IoUringSqe{})
SizeofIoUringCqe = unsafe.Sizeof(IoUringCqe{})
)
type IoUring struct {
Sq IoUringSq
Cq IoUringCq
Flags uint32
RingFd int
Features uint32
EnterRingFd int
IntFlags uint8
pad [3]uint8
pad2 uint32
}
type IoUringSq struct {
head unsafe.Pointer // *uint32
tail unsafe.Pointer // *uint32
ringMask unsafe.Pointer // *uint32
ringEntries unsafe.Pointer // *uint32
flags unsafe.Pointer // *uint32
dropped unsafe.Pointer // *uint32
Array uint32Array //ptr arith
Sqes ioUringSqeArray //ptr arith
SqeHead uint32
SqeTail uint32
RingSz uint32
RingPtr unsafe.Pointer
pad [4]uint32
}
func (sq *IoUringSq) _Head() *uint32 { return (*uint32)(sq.head) }
func (sq *IoUringSq) _Tail() *uint32 { return (*uint32)(sq.tail) }
func (sq *IoUringSq) _RingMask() *uint32 { return (*uint32)(sq.ringMask) }
func (sq *IoUringSq) _RingEntries() *uint32 { return (*uint32)(sq.ringEntries) }
func (sq *IoUringSq) _Flags() *uint32 { return (*uint32)(sq.flags) }
func (sq *IoUringSq) _Dropped() *uint32 { return (*uint32)(sq.dropped) }
type IoUringCq struct {
head unsafe.Pointer // *uint32
tail unsafe.Pointer // *uint32
ringMask unsafe.Pointer // *uint32
ringEntries unsafe.Pointer // *uint32
flags unsafe.Pointer // *uint32
overflow unsafe.Pointer // *uint32
Cqes ioUringCqeArray //ptr arith
RingSz uint32
RingPtr unsafe.Pointer
pad [4]uint32
}
func (cq *IoUringCq) _Head() *uint32 { return (*uint32)(cq.head) }
func (cq *IoUringCq) _Tail() *uint32 { return (*uint32)(cq.tail) }
func (cq *IoUringCq) _RingMask() *uint32 { return (*uint32)(cq.ringMask) }
func (cq *IoUringCq) _RingEntries() *uint32 { return (*uint32)(cq.ringEntries) }
func (cq *IoUringCq) _Flags() *uint32 { return (*uint32)(cq.flags) }
func (cq *IoUringCq) _Overflow() *uint32 { return (*uint32)(cq.overflow) }

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package gouring
import (
"testing"
"github.com/stretchr/testify/assert"
)
func TestDataSize(t *testing.T) {
assert.Equal(t, 64, int(SizeofIoUringSqe), "sqe data size mismatch")
assert.Equal(t, 16, int(SizeofIoUringCqe), "cqe data size mismatch")
}

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#!/bin/python3
import re
import subprocess
from io import BytesIO
from typing import Tuple, List
from sys import (
stdout as sys_stdout,
stderr as sys_stderr
)
# https://dave.cheney.net/2020/05/02/mid-stack-inlining-in-go
gcflags = [
"-m=2",
]
re_cost = re.compile(rb"with cost (\d+) as:")
re_cost2 = re.compile(rb"cost (\d+) exceeds")
def main():
h = subprocess.Popen(
args=["go","build","-gcflags="+" ".join(gcflags),"."],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
ret: Tuple[str, str] = h.communicate()
stdout, stderr = ret
lines: List[bytes] = stderr.split(b"\n")
inlined_lines: List[bytes] = [line for line in lines if b"inline" in line]
can_inline: List[Tuple[bytes, int]] = []
cannot_inline: List[Tuple[bytes, int]] = []
for line in inlined_lines:
if b"can inline" in line:
inline_cost = int(re_cost.findall(line)[0])
can_inline += [ (line, inline_cost) ]
elif b"cannot inline" in line:
cur_cost = 0
try:
cur_cost = int(re_cost2.findall(line)[0])
except: pass
cannot_inline += [ (line, cur_cost) ]
else:
sys_stderr.write(b"[UNK] ")
sys_stderr.write(line)
sys_stderr.write(b"\n")
# sort by cost
# can_inline = sorted(can_inline, key=lambda v: v[1])
# cannot_inline = sorted(cannot_inline, key=lambda v: v[1])
for item in can_inline:
print( (str(item[1]).encode() +b"\t"+ item[0]) .decode() )
print("============")
for item in cannot_inline:
print( (str(item[1]).encode() +b"\t"+ item[0]) .decode() )
if __name__ == "__main__":
main()

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mem_util.go
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package gouring
import (
"syscall"
"unsafe"
"github.com/pkg/errors"
)
const (
_uint32 uint32 = 0
_sz_uint32 = unsafe.Sizeof(_uint32)
)
//go:linkname mmap syscall.mmap
func mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error)
//go:linkname munmap syscall.munmap
func munmap(addr uintptr, length uintptr) (err error)
func setup(r *Ring, entries uint, parmas *IOUringParams) (ringFd int, err error) {
var sq = &r.sq
var cq = &r.cq
var p = &r.params
if ringFd, err = io_uring_setup(entries, p); err != nil {
err = errors.Wrap(err, "io_uring_setup")
return
}
if ringFd < 0 {
err = syscall.EAGAIN
return
}
featSingleMap := p.Features&IORING_FEAT_SINGLE_MMAP > 0
r.sringSz = p.SQOff.Array + p.SQEntries*uint32(_sz_uint32)
r.cringSz = p.CQOff.CQEs + p.CQEntries*uint32(_sz_cqe)
if featSingleMap {
if r.cringSz > r.sringSz {
r.sringSz = r.cringSz
}
}
// allocate ring mem
var sqRingPtr uintptr
var cqRingPtr uintptr
sqRingPtr, err = mmap(0, uintptr(r.sringSz),
syscall.PROT_READ|syscall.PROT_WRITE,
syscall.MAP_SHARED|syscall.MAP_POPULATE,
ringFd, IORING_OFF_SQ_RING)
if err != nil {
err = errors.Wrap(err, "mmap sqring")
return
}
if featSingleMap {
cqRingPtr = sqRingPtr
} else {
cqRingPtr, err = mmap(0, uintptr(r.cringSz),
syscall.PROT_READ|syscall.PROT_WRITE,
syscall.MAP_SHARED|syscall.MAP_POPULATE,
ringFd, IORING_OFF_CQ_RING)
if err != nil {
err = errors.Wrap(err, "mmap cqring")
return
}
}
r.sqRingPtr = sqRingPtr
r.cqRingPtr = cqRingPtr
//
// address Go's ring with base+offset allocated
sq.head = sqRingPtr + uintptr(p.SQOff.Head)
sq.tail = sqRingPtr + uintptr(p.SQOff.Tail)
sq.ringMask = sqRingPtr + uintptr(p.SQOff.RingMask)
sq.ringEntries = sqRingPtr + uintptr(p.SQOff.RingEntries)
sq.flags = sqRingPtr + uintptr(p.SQOff.Flags)
sq.array = uint32Array(sqRingPtr + uintptr(p.SQOff.Array))
r.sqesPtr, err = mmap(0, uintptr(p.SQEntries*uint32(_sz_sqe)),
syscall.PROT_READ|syscall.PROT_WRITE,
syscall.MAP_SHARED|syscall.MAP_POPULATE,
ringFd, IORING_OFF_SQES)
if err != nil {
err = errors.Wrap(err, "mmap sqes")
return
}
sq.sqes = sqeArray(r.sqesPtr)
//
cq.head = cqRingPtr + uintptr(p.CQOff.Head)
cq.tail = cqRingPtr + uintptr(p.CQOff.Tail)
cq.ringMask = cqRingPtr + uintptr(p.CQOff.RingMask)
cq.ringEntries = cqRingPtr + uintptr(p.CQOff.RingEntries)
cq.cqes = cqeArray(cqRingPtr + uintptr(p.CQOff.CQEs))
return
}
func unsetup(r *Ring) (err error) {
if r.sqesPtr != 0 {
if err = munmap(r.sqesPtr, uintptr(r.params.SQEntries)); err != nil {
err = errors.Wrap(err, "munmap sqes")
return
}
}
featSingleMap := r.params.Features&IORING_FEAT_SINGLE_MMAP > 0
if err = munmap(r.sqRingPtr, uintptr(r.sringSz)); err != nil {
err = errors.Wrap(err, "munmap sq")
}
if !featSingleMap || r.sqRingPtr != r.cqRingPtr { // not a single map
if err = munmap(r.cqRingPtr, uintptr(r.cringSz)); err != nil {
err = errors.Wrap(err, "munmap cq")
return
}
}
return
}
func register(r *Ring, opcode UringRegisterOpcode, arg uintptr, nrArg uint) (ret int, err error) {
if ret, err = io_uring_register(r.fd, opcode, arg, nrArg); err != nil {
err = errors.Wrap(err, "io_uring_register")
return
}
return
}
func enter(r *Ring, toSubmit, minComplete uint, flags UringEnterFlag, sig *Sigset_t) (ret int, err error) {
if ret, err = io_uring_enter(r.fd, toSubmit, minComplete, uint(flags), sig); err != nil {
err = errors.Wrap(err, "io_uring_enter")
return
}
return
}

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package gouring
import (
"syscall"
"unsafe"
)
func PrepRW(op IoUringOp, sqe *IoUringSqe, fd int,
addr unsafe.Pointer, len int, offset uint64) {
sqe.Opcode = op
sqe.Flags = 0
sqe.IoPrio = 0
sqe.Fd = int32(fd)
sqe.IoUringSqe_Union1 = IoUringSqe_Union1(offset) // union1
sqe.IoUringSqe_Union2 = *(*IoUringSqe_Union2)(unsafe.Pointer(&addr)) // union2
sqe.Len = uint32(len)
sqe.IoUringSqe_Union3 = 0 // sqe.SetOpFlags(0) // union3
sqe.IoUringSqe_Union4 = 0 // sqe.SetBufIndex(0) // union4
sqe.Personality = 0
sqe.IoUringSqe_Union5 = 0 // sqe.SetFileIndex(0) // union5
sqe.Addr3 = 0
sqe.__pad2[0] = 0
}
func PrepNop(sqe *IoUringSqe) {
PrepRW(IORING_OP_NOP, sqe, -1, nil, 0, 0)
}
func PrepTimeout(sqe *IoUringSqe, ts *syscall.Timespec, count uint32, flags uint32) {
PrepRW(IORING_OP_TIMEOUT, sqe, -1, unsafe.Pointer(ts), 1, uint64(count))
sqe.SetTimeoutFlags(flags)
}
func PrepTimeoutRemove(sqe *IoUringSqe, userDaata uint64, flags uint32) {
PrepRW(IORING_OP_TIMEOUT_REMOVE, sqe, -1, nil, 0, 0)
sqe.SetAddr_Value(userDaata)
sqe.SetTimeoutFlags(flags)
}
func PrepTimeoutUpdate(sqe *IoUringSqe, ts *syscall.Timespec, userData uint64, flags uint32) {
PrepRW(IORING_OP_TIMEOUT_REMOVE, sqe, -1, nil, 0, 0)
sqe.SetAddr_Value(userData)
sqe.SetTimeoutFlags(flags | IORING_TIMEOUT_UPDATE)
}
// ** "Syscall" OP
func PrepRead(sqe *IoUringSqe, fd int, buf *byte, nb int, offset uint64) {
PrepRW(IORING_OP_READ, sqe, fd, unsafe.Pointer(buf), nb, offset)
}
func PrepReadv(sqe *IoUringSqe, fd int,
iov *syscall.Iovec, nrVecs int,
offset uint64) {
PrepRW(IORING_OP_READV, sqe, fd, unsafe.Pointer(iov), nrVecs, offset)
}
func PrepReadv2(sqe *IoUringSqe, fd int,
iov *syscall.Iovec, nrVecs int,
offset uint64, flags uint32) {
PrepReadv(sqe, fd, iov, nrVecs, offset)
sqe.SetRwFlags(flags)
}
func PrepWrite(sqe *IoUringSqe, fd int, buf *byte, nb int, offset uint64) {
PrepRW(IORING_OP_WRITE, sqe, fd, unsafe.Pointer(buf), nb, offset)
}
func PrepWritev(sqe *IoUringSqe, fd int,
iov *syscall.Iovec, nrVecs int,
offset uint64) {
PrepRW(IORING_OP_WRITEV, sqe, fd, unsafe.Pointer(iov), nrVecs, offset)
}
func PrepWritev2(sqe *IoUringSqe, fd int,
iov *syscall.Iovec, nrVecs int,
offset uint64, flags uint32) {
PrepWritev(sqe, fd, iov, nrVecs, offset)
sqe.SetRwFlags(flags)
}
func PrepAccept(sqe *IoUringSqe, fd int, rsa *syscall.RawSockaddrAny, rsaSz *uintptr, flags uint) {
// *rsaSz = syscall.SizeofSockaddrAny // leave this out to caller?
PrepRW(IORING_OP_ACCEPT, sqe, fd, unsafe.Pointer(rsa), 0, uint64(uintptr(unsafe.Pointer(rsaSz))))
sqe.SetAcceptFlags(uint32(flags))
}
func PrepClose(sqe *IoUringSqe, fd int) {
PrepRW(IORING_OP_CLOSE, sqe, fd, nil, 0, 0)
}
func PrepRecvmsg(sqe *IoUringSqe, fd int, msg *syscall.Msghdr, flags uint) {
PrepRW(IORING_OP_RECVMSG, sqe, fd, unsafe.Pointer(msg), 1, 0)
sqe.SetMsgFlags(uint32(flags))
}
func PrepSendmsg(sqe *IoUringSqe, fd int, msg *syscall.Msghdr, flags uint) {
PrepRW(IORING_OP_SENDMSG, sqe, fd, unsafe.Pointer(msg), 1, 0)
sqe.SetMsgFlags(uint32(flags))
}
// ** Multishot
func PrepMultishotAccept(sqe *IoUringSqe, fd int, rsa *syscall.RawSockaddrAny, rsaSz *uintptr, flags uint) {
PrepAccept(sqe, fd, rsa, rsaSz, flags)
sqe.IoPrio |= IORING_ACCEPT_MULTISHOT
}

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package gouring
import (
"runtime"
"sync/atomic"
"syscall"
"unsafe"
)
const LIBURING_UDATA_TIMEOUT uint64 = ^uint64(0)
/*
* Returns true if we're not using SQ thread (thus nobody submits but us)
* or if IORING_SQ_NEED_WAKEUP is set, so submit thread must be explicitly
* awakened. For the latter case, we set the thread wakeup flag.
*/
func (ring *IoUring) sq_ring_needs_enter(flags *uint32) bool {
if ring.Flags&IORING_SETUP_SQPOLL == 0 {
return true
}
// FIXME: io_uring_smp_mb
if atomic.LoadUint32(ring.Sq._Flags())&IORING_SQ_NEED_WAKEUP != 0 {
*flags |= IORING_ENTER_SQ_WAKEUP
return true
}
return false
}
func (ring *IoUring) cq_ring_needs_flush() bool {
return atomic.LoadUint32(ring.Sq._Flags())&(IORING_SQ_CQ_OVERFLOW|IORING_SQ_TASKRUN) != 0
}
func (ring *IoUring) cq_ring_needs_enter() bool {
return (ring.Flags&IORING_SETUP_IOPOLL != 0) || ring.cq_ring_needs_flush()
}
type get_data struct {
submit uint32
waitNr uint32
getFlags uint32
sz int32
arg unsafe.Pointer
}
func (ring *IoUring) _io_uring_get_cqe(cqePtr **IoUringCqe, data *get_data) (err error) {
var cqe *IoUringCqe
var looped = false
var ret int
for {
var needEnter = false
var flags uint32 = 0
var nrAvail uint32 = 0
err = ring.__io_uring_peek_cqe(&cqe, &nrAvail)
if err != nil {
break
}
if cqe != nil && data.waitNr == 0 && data.submit == 0 {
if looped || !ring.cq_ring_needs_enter() {
err = syscall.EAGAIN
break
}
needEnter = true
}
if data.waitNr > nrAvail || needEnter {
flags = IORING_ENTER_GETEVENTS | data.getFlags
needEnter = true
}
if data.submit > 0 && ring.sq_ring_needs_enter(&flags) {
needEnter = true
}
if !needEnter {
break
}
if ring.IntFlags&INT_FLAG_REG_RING != 0 {
flags |= IORING_ENTER_REGISTERED_RING
}
ret, err = io_uring_enter2(ring.EnterRingFd, data.submit, data.waitNr, flags, (*Sigset_t)(data.arg), data.sz)
if err != nil {
break
}
data.submit -= uint32(ret)
if cqe != nil {
break
}
looped = true
}
*cqePtr = cqe
return
}
func (ring *IoUring) __io_uring_get_cqe(cqePtr **IoUringCqe, submit uint32, waitNr uint32, sigmask *Sigset_t) error {
data := &get_data{
submit: submit,
waitNr: waitNr,
getFlags: 0,
sz: NSIG / 8,
arg: unsafe.Pointer(sigmask),
}
return ring._io_uring_get_cqe(cqePtr, data)
}
/*
* Fill in an array of IO completions up to count, if any are available.
* Returns the amount of IO completions filled.
*/
func (ring *IoUring) io_uring_peek_batch_cqe(cqes []*IoUringCqe, count uint32) uint32 {
var ready uint32
var overflowChecked = false
var shift = 0
if ring.Flags&IORING_SETUP_CQE32 != 0 {
shift = 1
}
again:
ready = ring.io_uring_cq_ready()
if ready > 0 {
var head = *ring.Cq._Head()
var mask = *ring.Cq._RingMask()
var last uint32
if count > ready {
count = ready
}
last = head + count
var i uintptr = 0
for head != last {
cqes[i] = ioUringCqeArray_Index(ring.Cq.Cqes, uintptr((head&mask)<<uint32(shift)))
i++
head++
}
return count
}
if overflowChecked {
goto done
}
if ring.cq_ring_needs_flush() {
var flags uint32 = IORING_ENTER_GETEVENTS
if ring.IntFlags&INT_FLAG_REG_RING != 0 {
flags |= IORING_ENTER_REGISTERED_RING
}
io_uring_enter(ring.EnterRingFd, 0, 0, flags, nil)
overflowChecked = true
goto again
}
done:
return 0
}
/*
* Sync internal state with kernel ring state on the SQ side. Returns the
* number of pending items in the SQ ring, for the shared ring.
*/
func (ring *IoUring) __io_uring_flush_sq() uint32 {
sq := &ring.Sq
var mask = *sq._RingMask()
var ktail = *sq._Tail()
var toSubmit = sq.SqeTail - sq.SqeHead
if toSubmit < 1 {
goto out
}
/*
* Fill in sqes that we have queued up, adding them to the kernel ring
*/
for ; toSubmit > 0; toSubmit-- {
*uint32Array_Index(sq.Array, uintptr(ktail&mask)) = sq.SqeHead & mask
ktail++
sq.SqeHead++
}
/*
* Ensure that the kernel sees the SQE updates before it sees the tail
* update.
*/
atomic.StoreUint32(sq._Tail(), ktail)
out:
/*
* This _may_ look problematic, as we're not supposed to be reading
* SQ->head without acquire semantics. When we're in SQPOLL mode, the
* kernel submitter could be updating this right now. For non-SQPOLL,
* task itself does it, and there's no potential race. But even for
* SQPOLL, the load is going to be potentially out-of-date the very
* instant it's done, regardless or whether or not it's done
* atomically. Worst case, we're going to be over-estimating what
* we can submit. The point is, we need to be able to deal with this
* situation regardless of any perceived atomicity.
*/
return ktail - *sq._Head()
}
/*
* If we have kernel support for IORING_ENTER_EXT_ARG, then we can use that
* more efficiently than queueing an internal timeout command.
*/
func (ring *IoUring) io_uring_wait_cqes_new(cqePtr **IoUringCqe, waitNtr uint32, ts *syscall.Timespec, sigmask *Sigset_t) error {
arg := &IoUringGeteventsArg{
Sigmask: uint64(uintptr(unsafe.Pointer(sigmask))),
SigmaskSz: NSIG / 8,
Ts: uint64(uintptr(unsafe.Pointer(ts))),
}
data := &get_data{
waitNr: waitNtr,
getFlags: IORING_ENTER_EXT_ARG,
sz: int32(unsafe.Sizeof(arg)),
}
return ring._io_uring_get_cqe(cqePtr, data)
}
/*
* Like io_uring_wait_cqe(), except it accepts a timeout value as well. Note
* that an sqe is used internally to handle the timeout. For kernel doesn't
* support IORING_FEAT_EXT_ARG, applications using this function must never
* set sqe->user_data to LIBURING_UDATA_TIMEOUT!
*
* For kernels without IORING_FEAT_EXT_ARG (5.10 and older), if 'ts' is
* specified, the application need not call io_uring_submit() before
* calling this function, as we will do that on its behalf. From this it also
* follows that this function isn't safe to use for applications that split SQ
* and CQ handling between two threads and expect that to work without
* synchronization, as this function manipulates both the SQ and CQ side.
*
* For kernels with IORING_FEAT_EXT_ARG, no implicit submission is done and
* hence this function is safe to use for applications that split SQ and CQ
* handling between two threads.
*/
func (ring *IoUring) __io_uring_submit_timeout(waitNr uint32, ts *syscall.Timespec) (ret int, err error) {
sqe := ring.io_uring_get_sqe()
if sqe == nil {
ret, err = ring.io_uring_submit()
if err != nil {
return
}
sqe = ring.io_uring_get_sqe()
if sqe == nil {
err = syscall.EAGAIN
return
}
}
PrepTimeout(sqe, ts, waitNr, 0)
sqe.UserData.SetUint64(LIBURING_UDATA_TIMEOUT)
ret = int(ring.__io_uring_flush_sq())
return
}
func (ring *IoUring) io_uring_wait_cqes(cqePtr **IoUringCqe, waitNtr uint32, ts *syscall.Timespec, sigmask *Sigset_t) (err error) {
var toSubmit = 0
if ts != nil {
if ring.Features&IORING_FEAT_EXT_ARG != 0 {
err = ring.io_uring_wait_cqes_new(cqePtr, waitNtr, ts, sigmask)
return
}
toSubmit, err = ring.__io_uring_submit_timeout(waitNtr, ts)
if err != nil {
return
}
}
err = ring.__io_uring_get_cqe(cqePtr, uint32(toSubmit), waitNtr, sigmask)
return
}
func (ring *IoUring) io_uring_submit_and_wait_timeout(cqePtr **IoUringCqe, waitNtr uint32, ts *syscall.Timespec, sigmask *Sigset_t) (err error) {
var toSubmit int
if ts != nil {
if ring.Features&IORING_FEAT_EXT_ARG != 0 {
arg := IoUringGeteventsArg{
Sigmask: uint64(uintptr(unsafe.Pointer(sigmask))),
SigmaskSz: NSIG / 8,
Ts: uint64(uintptr(unsafe.Pointer(ts))),
}
data := &get_data{
submit: ring.__io_uring_flush_sq(),
waitNr: waitNtr,
getFlags: IORING_ENTER_EXT_ARG,
sz: int32(unsafe.Sizeof(arg)),
arg: unsafe.Pointer(&arg),
}
return ring._io_uring_get_cqe(cqePtr, data)
}
toSubmit, err = ring.__io_uring_submit_timeout(waitNtr, ts)
if err != nil {
return
}
} else {
toSubmit = int(ring.__io_uring_flush_sq())
}
err = ring.__io_uring_get_cqe(cqePtr, uint32(toSubmit), waitNtr, sigmask)
return
}
/*
* See io_uring_wait_cqes() - this function is the same, it just always uses
* '1' as the wait_nr.
*/
func (ring *IoUring) io_uring_wait_cqe_timeout(cqePtr **IoUringCqe, ts *syscall.Timespec) error {
return ring.io_uring_wait_cqes(cqePtr, 1, ts, nil)
}
/*
* Submit sqes acquired from io_uring_get_sqe() to the kernel.
*
* Returns number of sqes submitted
*/
func (ring *IoUring) io_uring_submit() (int, error) {
return ring.__io_uring_submit_and_wait(0)
}
/*
* Like io_uring_submit(), but allows waiting for events as well.
*
* Returns number of sqes submitted
*/
func (ring *IoUring) io_uring_submit_and_wait(waitNtr uint32) (int, error) {
return ring.__io_uring_submit_and_wait(waitNtr)
}
func (ring *IoUring) __io_uring_submit_and_wait(waitNr uint32) (int, error) {
return ring.__io_uring_submit(ring.__io_uring_flush_sq(), waitNr)
}
func (ring *IoUring) __io_uring_submit(submitted uint32, waitNr uint32) (ret int, err error) {
var flags uint32 = 0
if ring.sq_ring_needs_enter(&flags) || waitNr != 0 {
if waitNr != 0 || ring.Flags&IORING_SETUP_IOPOLL != 0 {
flags |= IORING_ENTER_GETEVENTS
}
if ring.IntFlags&INT_FLAG_REG_RING != 0 {
flags |= IORING_ENTER_REGISTERED_RING
}
ret, err = io_uring_enter(ring.EnterRingFd, submitted, waitNr, flags, nil)
} else {
ret = int(submitted)
}
return
}
func (ring *IoUring) io_uring_get_sqe() *IoUringSqe {
return ring._io_uring_get_sqe()
}
/*
* Return an sqe to fill. Application must later call io_uring_submit()
* when it's ready to tell the kernel about it. The caller may call this
* function multiple times before calling io_uring_submit().
*
* Returns a vacant sqe, or NULL if we're full.
*/
func (ring *IoUring) _io_uring_get_sqe() (sqe *IoUringSqe) {
sq := &ring.Sq
var head = atomic.LoadUint32(sq._Head())
var next = sq.SqeTail + 1
var shift uint32 = 0
if ring.Flags&IORING_SETUP_SQE128 != 0 {
shift = 1
}
if next-head <= *sq._RingEntries() {
sqe = ioUringSqeArray_Index(sq.Sqes, uintptr((sq.SqeTail&*sq._RingMask())<<shift))
sq.SqeTail = next
return
}
sqe = nil
return
}
func (ring *IoUring) io_uring_cq_ready() uint32 {
return atomic.LoadUint32(ring.Cq._Tail()) - *ring.Cq._Head()
}
func (ring *IoUring) __io_uring_peek_cqe(cqePtr **IoUringCqe, nrAvail *uint32) error {
var cqe *IoUringCqe
var err int32 = 0
var avail int
var mask = *ring.Cq._RingMask()
var shift uint32 = 0
if ring.Flags&IORING_SETUP_CQE32 != 0 {
shift = 1
}
for {
var tail = atomic.LoadUint32(ring.Cq._Tail())
var head = *ring.Cq._Head()
cqe = nil
avail = int(tail - head)
if avail < 1 {
break
}
cqe = ioUringCqeArray_Index(ring.Cq.Cqes, uintptr((head&mask)<<shift))
if ring.Features&IORING_FEAT_EXT_ARG == 0 &&
cqe.UserData.GetUint64() == LIBURING_UDATA_TIMEOUT {
if cqe.Res < 0 {
err = cqe.Res
}
ring.io_uring_cq_advance(1)
if err == 0 {
// yields G
runtime.Gosched()
continue
}
cqe = nil
}
break
}
*cqePtr = cqe
if nrAvail != nil {
*nrAvail = uint32(avail)
}
if err == 0 {
return nil
}
return syscall.Errno(-err)
}
func (ring *IoUring) io_uring_cq_advance(nr uint32) {
if nr > 0 {
atomic.StoreUint32(ring.Cq._Head(), *ring.Cq._Head()+nr)
}
}
/*
* Return an IO completion, waiting for 'wait_nr' completions if one isn't
* readily available. Returns 0 with cqe_ptr filled in on success, -errno on
* failure.
*/
func (ring *IoUring) io_uring_wait_cqe_nr(cqePtr **IoUringCqe, waitNr uint32) error {
return ring.__io_uring_get_cqe(cqePtr, 0, waitNr, nil)
}
/*
* Return an IO completion, if one is readily available. Returns 0 with
* cqe_ptr filled in on success, -errno on failure.
*/
func (ring *IoUring) io_uring_peek_cqe(cqePtr **IoUringCqe) error {
err := ring.__io_uring_peek_cqe(cqePtr, nil)
if err == nil && *cqePtr != nil {
return nil
}
return ring.io_uring_wait_cqe_nr(cqePtr, 0)
}
/*
* Return an IO completion, waiting for it if necessary. Returns 0 with
* cqe_ptr filled in on success, -errno on failure.
*/
func (ring *IoUring) io_uring_wait_cqe(cqePtr **IoUringCqe) error {
err := ring.__io_uring_peek_cqe(cqePtr, nil)
if err == nil && *cqePtr != nil {
return nil
}
return ring.io_uring_wait_cqe_nr(cqePtr, 1)
}
/*
* Must be called after io_uring_{peek,wait}_cqe() after the cqe has
* been processed by the application.
*/
func (ring *IoUring) io_uring_cqe_seen(cqe *IoUringCqe) {
if cqe != nil {
ring.io_uring_cq_advance(1)
}
}

195
queue/queue.go
View file

@ -1,195 +0,0 @@
package queue
// Modified form
// https://github.com/iceber/io_uring-go types.go
import (
"errors"
"runtime"
"sync"
"sync/atomic"
"syscall"
"github.com/ii64/gouring"
)
var (
ErrQueueClosed = errors.New("queue closed")
)
type Queue struct {
ring *gouring.Ring
sq *gouring.SQRing
cq *gouring.CQRing
sqeHead uint32
sqeTail uint32
sMx sync.Mutex
cqMx sync.RWMutex // tbd...
clq uint32
}
func New(ring *gouring.Ring) *Queue {
if ring == nil {
return nil
}
sq := ring.SQ()
cq := ring.CQ()
return &Queue{
ring: ring,
sq: sq,
cq: cq,
clq: 0,
}
}
func (q *Queue) Close() error {
atomic.StoreUint32(&q.clq, 1)
return nil
}
func (q *Queue) precheck() (err error) {
if clq := atomic.LoadUint32(&q.clq); clq == 1 {
err = ErrQueueClosed
return
}
return
}
//
func (q *Queue) _getSQEntry() *gouring.SQEntry {
head := atomic.LoadUint32(q.sq.Head())
next := q.sqeTail + 1
if (next - head) <= atomic.LoadUint32(q.sq.RingEntries()) {
sqe := q.sq.Get(q.sqeTail & atomic.LoadUint32(q.sq.RingMask()))
q.sqeTail = next
sqe.Reset()
return sqe
}
return nil
}
func (q *Queue) GetSQEntry() (sqe *gouring.SQEntry) {
for {
sqe = q._getSQEntry()
if sqe != nil {
return
}
runtime.Gosched()
}
}
func (q *Queue) sqFallback(d uint32) {
q.sqeTail -= d
}
func (q *Queue) sqFlush() uint32 {
if q.sqeHead == q.sqeTail {
return atomic.LoadUint32(q.sq.Tail()) - atomic.LoadUint32(q.sq.Head())
}
ktail := atomic.LoadUint32(q.sq.Tail())
for toSubmit := q.sqeTail - q.sqeHead; toSubmit > 0; toSubmit-- {
*q.sq.Array().Get(ktail & (*q.sq.RingMask())) = q.sqeHead & (*q.sq.RingMask())
ktail++
q.sqeHead++
}
atomic.StoreUint32(q.sq.Tail(), ktail)
return ktail - *q.sq.Head()
}
func (q *Queue) isNeedEnter(flags *uint32) bool {
if (q.ring.Params().Features & gouring.IORING_SETUP_SQPOLL) > 0 {
return true
}
if q.sq.IsNeedWakeup() {
*flags |= gouring.IORING_SQ_NEED_WAKEUP
return true
}
return false
}
func (q *Queue) Submit() (ret int, err error) {
q.sMx.Lock()
defer q.sMx.Unlock()
submitted := q.sqFlush()
var flags uint32
if !q.isNeedEnter(&flags) || submitted == 0 {
return
}
if (q.ring.Params().Flags & gouring.IORING_SETUP_IOPOLL) > 0 {
flags |= gouring.IORING_ENTER_GETEVENTS
}
ret, err = q.ring.Enter(uint(submitted), 0, flags, nil)
return
}
//
func (q *Queue) cqPeek() (cqe *gouring.CQEntry) {
head := atomic.LoadUint32(q.cq.Head())
if head != atomic.LoadUint32(q.cq.Tail()) {
cqe = q.cq.Get(head & atomic.LoadUint32(q.cq.RingMask()))
}
return
}
func (q *Queue) cqAdvance(d uint32) {
if d != 0 {
atomic.AddUint32(q.cq.Head(), d)
}
}
func (q *Queue) GetCQEvent(wait bool) (cqe *gouring.CQEntry, err error) {
if err = q.precheck(); err != nil {
return
}
var tryPeeks int
for {
if cqe = q.cqPeek(); cqe != nil {
q.cqAdvance(1)
return
}
if !wait && !q.sq.IsCQOverflow() {
err = syscall.EAGAIN
return
}
if q.sq.IsCQOverflow() {
_, err = q.ring.Enter(0, 0, gouring.IORING_ENTER_GETEVENTS, nil)
if err != nil {
return
}
continue
}
if tryPeeks++; tryPeeks < 3 {
runtime.Gosched()
continue
}
// implement interrupt
}
}
func (q *Queue) Run(f func(cqe *gouring.CQEntry)) {
for q.precheck() == nil {
cqe, err := q.GetCQEvent(true)
if cqe == nil || err != nil {
// fmt.Printf("run error: %+#v\n", err)
if err == ErrQueueClosed {
return
}
continue
}
f(cqe)
}
}

72
queue/queue_test.go
View file

@ -1,72 +0,0 @@
package queue
import (
"fmt"
"strings"
"sync"
"syscall"
"testing"
"github.com/ii64/gouring"
"github.com/stretchr/testify/assert"
)
func write(sqe *gouring.SQEntry, fd int, b []byte) {
sqe.Opcode = gouring.IORING_OP_WRITE
sqe.Fd = int32(fd)
sqe.Len = uint32(len(b))
sqe.SetOffset(0)
// *sqe.Addr() = (uint64)(uintptr(unsafe.Pointer(&b[0])))
sqe.SetAddr(&b[0])
}
func TestQueue(t *testing.T) {
ring, err := gouring.New(256, nil)
assert.NoError(t, err, "create ring")
defer func() {
err := ring.Close()
assert.NoError(t, err, "close ring")
}()
mkdata := func(i int) []byte {
return []byte("queue pls" + strings.Repeat("!", i) + fmt.Sprintf("%d", i) + "\n")
}
N := 64 + 64
var wg sync.WaitGroup
btests := [][]byte{}
for i := 0; i < N; i++ {
btests = append(btests, mkdata(i))
}
wg.Add(N)
// create new queue
q := New(ring)
go func() {
for i, b := range btests {
sqe := q.GetSQEntry()
sqe.UserData = uint64(i)
// sqe.Flags = gouring.IOSQE_IO_DRAIN
write(sqe, syscall.Stdout, b)
if (i+1)%2 == 0 {
n, err := q.Submit()
assert.NoError(t, err, "queue submit")
assert.Equal(t, n, 2, "submit count mismatch")
fmt.Printf("submitted %d\n", n)
}
}
}()
go func() {
q.Run(func(cqe *gouring.CQEntry) {
defer wg.Done()
assert.Condition(t, func() (success bool) {
return cqe.UserData < uint64(len(btests))
}, "userdata is set with the btest index")
assert.Conditionf(t, func() (success bool) {
return len(btests[cqe.UserData]) == int(cqe.Res)
}, "OP_WRITE result mismatch: %+#v", cqe)
})
}()
wg.Wait()
}

228
queue_test.go Normal file
View file

@ -0,0 +1,228 @@
package gouring
import (
"context"
"fmt"
"os"
"reflect"
"runtime"
"sync"
"syscall"
"testing"
"unsafe"
"github.com/davecgh/go-spew/spew"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestRingQueueGetSQE(t *testing.T) {
h := testNewIoUring(t, 256, 0)
defer h.Close()
assert.NotEqual(t, 0, h.RingFd)
assert.NotEqual(t, 0, h.EnterRingFd)
sqe := h.io_uring_get_sqe()
assert.NotNil(t, sqe)
fmt.Printf("%+#v\n", sqe)
}
// func TestRingSqpollOnly(t *testing.T) {
// h := testNewIoUringWithParams(t, 256, &IoUringParams{
// Flags: IORING_SETUP_SQPOLL,
// SqThreadCpu: 10, // ms
// SqThreadIdle: 10_000,
// })
// for i := 0; i < 10; i++ {
// sqe := h.GetSqe()
// PrepNop(sqe)
// }
// h.Submit()
// var cqe *IoUringCqe
// for {
// h.WaitCqe(&cqe)
// spew.Dump(cqe)
// h.SeenCqe(cqe)
// }
// }
func TestRingQueueOrderRetrieval(t *testing.T) {
const entries = 256
h := testNewIoUring(t, entries, 0)
defer h.Close()
var i uint64
for i = 0; i < entries; i++ {
sqe := h.GetSqe()
PrepNop(sqe)
sqe.UserData.SetUint64(i)
sqe.Flags |= IOSQE_IO_LINK // ordered
}
submitted, err := h.SubmitAndWait(entries)
require.NoError(t, err)
require.Equal(t, int(entries), submitted)
var cqe *IoUringCqe
for i = 0; i < entries; i++ {
err = h.WaitCqe(&cqe)
require.NoError(t, err)
require.NotNil(t, cqe)
require.Equal(t, i, cqe.UserData.GetUint64())
h.SeenCqe(cqe)
}
}
func TestRingQueueSubmitSingleConsumer(t *testing.T) {
type opt struct {
name string
jobCount int
entries uint32
p IoUringParams
}
ts := []opt{
{"def-1-256", 1, 256, IoUringParams{}},
{"def-128-256", 256, 256, IoUringParams{}}, // passed 128
{"def-128-256", 256, 256, IoUringParams{}}, // passed 128
{"def-8-256", 8, 256, IoUringParams{}},
{"def-16-256", 16, 256, IoUringParams{}},
{"def-32-256", 32, 256, IoUringParams{}},
{"def-64-256", 64, 256, IoUringParams{}},
{"def-128-256", 128, 256, IoUringParams{}},
{"def-128+1-256", 128 + 1, 256, IoUringParams{}}, // passed 128
{"def-128+2-256", 128 + 2, 256, IoUringParams{}}, // passed 128
{"def-256-256", 256, 256, IoUringParams{}},
{"sqpoll-127-256", 127, 256, IoUringParams{Flags: IORING_SETUP_SQPOLL, SqThreadCpu: 4, SqThreadIdle: 10_000}},
{"sqpoll-128+2-256", 128 + 2, 256, IoUringParams{Flags: IORING_SETUP_SQPOLL, SqThreadCpu: 4, SqThreadIdle: 10_000}},
{"sqpoll-256-256", 256, 256, IoUringParams{Flags: IORING_SETUP_SQPOLL, SqThreadCpu: 4, SqThreadIdle: 10_000}},
// we can have other test for queue overflow.
}
for _, tc := range ts {
t.Run(tc.name, func(t *testing.T) {
ftmp, err := os.CreateTemp(os.TempDir(), "test_iouring_queue_sc_*")
require.NoError(t, err)
defer ftmp.Close()
fdTemp := ftmp.Fd()
consumer := func(h *IoUring, ctx context.Context, wg *sync.WaitGroup) {
var cqe *IoUringCqe
var err error
defer func() {
rec := recover()
if rec != nil {
spew.Dump(cqe)
}
}()
for ctx.Err() == nil {
err = h.io_uring_wait_cqe(&cqe)
if err == syscall.EINTR {
// ignore INTR
continue
}
if err != nil {
panic(err)
}
if cqe.Res < 0 {
panic(syscall.Errno(-cqe.Res))
}
// cqe data check
if int(cqe.Res) < len("data ") {
panic(fmt.Sprintf("write less that it should"))
}
if (cqe.UserData.GetUintptr()>>(8<<2))&0xff == 0x00 {
panic(fmt.Sprintf("cqe userdata should contain canonical address got %+#v", cqe.UserData))
}
bufPtr := (*[]byte)(cqe.UserData.GetUnsafe())
buf := *bufPtr // deref check
_ = buf
// fmt.Printf("%+#v %s", buf, buf)
h.io_uring_cqe_seen(cqe) // necessary
wg.Done()
}
}
submit := func(t *testing.T, opt *IoUringParams, h *IoUring, expectedSubmitCount int) {
submitted, err := h.io_uring_submit()
assert.NoError(t, err)
if opt.Flags&IORING_SETUP_SQPOLL == 0 {
assert.Equal(t, expectedSubmitCount, submitted)
}
}
t.Run("submit_single", func(t *testing.T) {
var wg sync.WaitGroup
h := testNewIoUringWithParams(t, 256, &tc.p)
defer h.Close()
wg.Add(tc.jobCount)
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
go consumer(h, ctx, &wg)
for i := 0; i < tc.jobCount; i++ {
var sqe *IoUringSqe
for { // sqe could be nil if SQ is already full so we spin until we got one
sqe = h.io_uring_get_sqe()
if sqe != nil {
break
}
}
var buf = new([]byte)
*buf = append(*buf, []byte(fmt.Sprintf("data %d\n", i))...)
reflect.ValueOf(buf) // escape the `buf`
PrepWrite(sqe, int(fdTemp), &(*buf)[0], len((*buf)), 0)
runtime.KeepAlive(buf)
sqe.UserData.SetUnsafe(unsafe.Pointer(buf))
// submit
submit(t, &tc.p, h, 1)
}
runtime.GC()
wg.Wait()
})
t.Run("submit_bulk", func(t *testing.T) {
var wg sync.WaitGroup
h := testNewIoUringWithParams(t, 256, &tc.p)
defer h.Close()
wg.Add(tc.jobCount)
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
go consumer(h, ctx, &wg)
for i := 0; i < tc.jobCount; i++ {
sqe := h.io_uring_get_sqe()
if sqe == nil {
// spin until we got one
continue
}
buf := new([]byte)
*buf = append(*buf, []byte(fmt.Sprintf("data %d\n", i))...)
PrepWrite(sqe, int(fdTemp), &(*buf)[0], len((*buf)), 0)
sqe.UserData.SetUnsafe(unsafe.Pointer(buf))
}
submit(t, &tc.p, h, tc.jobCount)
runtime.GC()
wg.Wait()
})
})
}
}

276
register.go Normal file
View file

@ -0,0 +1,276 @@
package gouring
import (
"syscall"
"unsafe"
)
func (ring *IoUring) io_uring_register_buffers_update_tag(off uint32,
iov *syscall.Iovec,
tags []uint64,
nr uint32) error {
up := &IoUringRsrcUpdate2{
Offset: off,
Data: uint64(uintptr(unsafe.Pointer(iov))),
Tags: uint64(uintptr(unsafe.Pointer(&tags[0]))),
Nr: nr,
}
ret, err := io_uring_register(ring.RingFd, IORING_REGISTER_BUFFERS_UPDATE,
unsafe.Pointer(up), unsafe.Sizeof(*up))
if err != nil {
return err
}
_ = ret
return nil
}
func (ring *IoUring) io_uring_register_buffers_tags(
iov *syscall.Iovec,
tags []uint64,
nr uint32) error {
reg := &IoUringRsrcRegister{
Nr: nr,
Data: uint64(uintptr(unsafe.Pointer(iov))),
Tags: uint64(uintptr(unsafe.Pointer(&tags[0]))),
}
ret, err := io_uring_register(ring.RingFd, IORING_REGISTER_BUFFERS2,
unsafe.Pointer(reg), unsafe.Sizeof(*reg))
if err != nil {
return err
}
_ = ret
return nil
}
func (ring *IoUring) io_uring_register_buffers_sparse(nr uint32) error {
reg := &IoUringRsrcRegister{
Flags: IORING_RSRC_REGISTER_SPARSE,
Nr: nr,
}
ret, err := io_uring_register(ring.RingFd, IORING_RSRC_REGISTER_SPARSE,
unsafe.Pointer(reg), unsafe.Sizeof(*reg))
if err != nil {
return err
}
_ = ret
return nil
}
func (ring *IoUring) io_uring_register_buffers(iov *syscall.Iovec, nrIov uint32) int {
ret, err := io_uring_register(ring.RingFd, IORING_REGISTER_BUFFERS,
unsafe.Pointer(iov), uintptr(nrIov))
if err != nil {
return 0
}
return ret
}
func (ring *IoUring) io_uring_unregister_buffers() int {
ret, err := io_uring_register(ring.RingFd, IORING_UNREGISTER_BUFFERS, nil, 0)
if err != nil {
return 0
}
return ret
}
func (ring *IoUring) io_uring_register_files_update_tag(off uint32,
files []int, tags []uint64,
nrFiles uint32) (int, error) {
up := &IoUringRsrcUpdate2{
Offset: off,
Data: uint64(uintptr(unsafe.Pointer(&files[0]))),
Tags: uint64(uintptr(unsafe.Pointer(&tags[0]))),
Nr: nrFiles,
}
return io_uring_register(ring.RingFd, IORING_REGISTER_FILES_UPDATE2,
unsafe.Pointer(up),
unsafe.Sizeof(*up))
}
func (ring *IoUring) io_uring_register_files_update(off uint32,
files []int, nrFiles uint32) (int, error) {
up := &IoUringFilesUpdate{
Offset: off,
Fds: uint64(uintptr(unsafe.Pointer(&files[0]))),
}
return io_uring_register(ring.RingFd, IORING_REGISTER_FILES_UPDATE,
unsafe.Pointer(up), uintptr(nrFiles))
}
func (ring *IoUring) io_uring_register_files_sparse(nr uint32) (ret int, err error) {
reg := &IoUringRsrcRegister{
Flags: IORING_RSRC_REGISTER_SPARSE,
Nr: nr,
}
var didIncrease bool
for {
ret, err = io_uring_register(ring.RingFd, IORING_REGISTER_FILES2,
unsafe.Pointer(reg),
unsafe.Sizeof(*reg))
if err == nil {
break
}
if err == syscall.EMFILE && !didIncrease {
increase_rlimit_nofile(uint64(nr))
didIncrease = true
continue
}
break
}
return
}
func (ring *IoUring) io_uring_register_files_tags(
files []int,
tags []uint64, nr uint32) (ret int, err error) {
reg := &IoUringRsrcRegister{
Nr: nr,
Data: uint64(uintptr(unsafe.Pointer(&files[0]))),
Tags: uint64(uintptr(unsafe.Pointer(&tags[0]))),
}
var didIncrease bool
for {
ret, err = io_uring_register(ring.RingFd, IORING_REGISTER_FILES2,
unsafe.Pointer(reg), unsafe.Sizeof(*reg))
if err == nil {
break
}
if err == syscall.EMFILE && !didIncrease {
increase_rlimit_nofile(uint64(nr))
didIncrease = true
continue
}
break
}
return
}
func (ring *IoUring) io_uring_register_files(
files []int, nrFiles uint32) (ret int, err error) {
var didIncrease bool
for {
ret, err = io_uring_register(ring.RingFd, IORING_REGISTER_FILES,
unsafe.Pointer(&files[0]), uintptr(nrFiles))
if err == nil {
break
}
if err == syscall.EMFILE && !didIncrease {
increase_rlimit_nofile(uint64(nrFiles))
didIncrease = true
continue
}
break
}
return
}
func (ring *IoUring) io_uring_unregister_files() int {
ret, err := io_uring_register(ring.RingFd, IORING_UNREGISTER_FILES, nil, 0)
if err != nil {
return 0
}
return ret
}
func (ring *IoUring) io_uring_unregister_eventfd() int {
ret, err := io_uring_register(ring.RingFd, IORING_UNREGISTER_EVENTFD, nil, 0)
if err != nil {
return 0
}
return ret
}
func (ring *IoUring) io_uring_register_eventfd_async(eventFd int) int {
ret, err := io_uring_register(ring.RingFd, IORING_REGISTER_EVENTFD_ASYNC, nil, 0)
if err != nil {
return 0
}
return ret
}
func (ring *IoUring) io_uring_register_probe(p *IoUringProbe, nrOps uint32) int {
ret, err := io_uring_register(ring.RingFd, IORING_REGISTER_PROBE,
unsafe.Pointer(p), uintptr(nrOps))
if err != nil {
return 0
}
return ret
}
func (ring *IoUring) io_uring_register_personality() (int, error) {
return io_uring_register(ring.RingFd, IORING_REGISTER_PERSONALITY, nil, 0)
}
func (ring *IoUring) io_uring_unregister_personality(id int32) (int, error) {
return io_uring_register(ring.RingFd, IORING_UNREGISTER_PERSONALITY, nil, uintptr(id))
}
func (ring *IoUring) io_uring_register_restrictions(res *IoUringRestriction, nrRes uint32) int {
ret, err := io_uring_register(ring.RingFd, IORING_REGISTER_RESTRICTIONS,
unsafe.Pointer(res), uintptr(nrRes))
if err != nil {
return 0
}
return ret
}
func (ring *IoUring) io_uring_enable_rings() error {
_, err := io_uring_register(ring.RingFd, IORING_REGISTER_ENABLE_RINGS, nil, 0)
return err
}
// sched.h
// func io_uring_register_iowq_aff(ring *IoUring, cpuSz int, mask *CpuSet) {
// }
func (ring *IoUring) io_uring_unregister_iowq_aff() error {
_, err := io_uring_register(ring.RingFd, IORING_UNREGISTER_IOWQ_AFF, nil, 0)
return err
}
func (ring *IoUring) io_uring_register_iowq_max_workers(val *uint32) (int, error) {
return io_uring_register(ring.RingFd, IORING_REGISTER_IOWQ_MAX_WORKERS,
unsafe.Pointer(val), 2)
}
func (ring *IoUring) io_uring_register_ring_fd() (int, error) {
up := &IoUringRsrcUpdate{
Data: uint64(ring.RingFd),
Offset: ^uint32(0),
}
ret, err := io_uring_register(ring.RingFd, IORING_REGISTER_RING_FDS,
unsafe.Pointer(up), 1)
if err != nil {
return 0, err
}
ring.EnterRingFd = int(up.Offset)
ring.IntFlags |= INT_FLAG_REG_RING
return ret, nil
}
func (ring *IoUring) io_uring_unregister_ring_fd() error {
up := &IoUringRsrcUpdate{
Offset: uint32(ring.EnterRingFd),
}
ret, err := io_uring_register(ring.RingFd, IORING_UNREGISTER_RING_FDS,
unsafe.Pointer(up), 1)
if err != nil {
return err
}
if ret == 1 {
ring.EnterRingFd = ring.RingFd
ring.IntFlags &= ^INT_FLAG_REG_RING
}
return nil
}
func (ring *IoUring) io_uring_register_buf_ring(reg *IoUringBufReg, flags uint32) (int, error) {
return io_uring_register(ring.RingFd, IORING_REGISTER_PBUF_RING, unsafe.Pointer(reg), 1)
}
func (ring *IoUring) io_uring_unregister_buf_ring(bgId int32) (int, error) {
reg := &IoUringBufReg{
Bgid: uint16(bgId),
}
return io_uring_register(ring.RingFd, IORING_UNREGISTER_PBUF_RING, unsafe.Pointer(reg), 1)
}

131
ring.go
View file

@ -1,131 +0,0 @@
package gouring
import (
"sync/atomic"
"unsafe"
)
type Ring struct {
fd int
params IOUringParams
sq SQRing
cq CQRing
// cached ringn value
sqRingPtr, cqRingPtr, sqesPtr uintptr
sringSz, cringSz uint32
}
//
//-- SQ
type SQRing struct {
head uintptr
tail uintptr
ringMask uintptr
ringEntries uintptr
flags uintptr
array uint32Array
sqes sqeArray
}
func (sq SQRing) Get(idx uint32) *SQEntry {
if uintptr(idx) >= uintptr(*sq.RingEntries()) {
return nil
}
return sq.sqes.Get(uintptr(idx))
}
func (sq SQRing) Head() *uint32 {
return (*uint32)(unsafe.Pointer(sq.head))
}
func (sq SQRing) Tail() *uint32 {
return (*uint32)(unsafe.Pointer(sq.tail))
}
func (sq SQRing) RingMask() *uint32 {
return (*uint32)(unsafe.Pointer(sq.ringMask))
}
func (sq SQRing) RingEntries() *uint32 {
return (*uint32)(unsafe.Pointer(sq.ringEntries))
}
func (sq SQRing) Flags() *uint32 {
return (*uint32)(unsafe.Pointer(sq.flags))
}
func (sq SQRing) Array() uint32Array {
return sq.array
}
func (sq SQRing) Event() sqeArray {
return sq.sqes
}
func (sq SQRing) IsCQOverflow() bool {
return atomic.LoadUint32(sq.Flags())&IORING_SQ_CQ_OVERFLOW > 0
}
func (sq SQRing) IsNeedWakeup() bool {
return atomic.LoadUint32(sq.Flags())&IORING_SQ_NEED_WAKEUP > 0
}
//
type uint32Array uintptr
func (a uint32Array) Get(idx uint32) *uint32 {
return (*uint32)(unsafe.Pointer(uintptr(a) + uintptr(idx)*_sz_uint32))
}
func (a uint32Array) Set(idx uint32, v uint32) {
atomic.StoreUint32(a.Get(idx), v)
}
type sqeArray uintptr
func (sa sqeArray) Get(idx uintptr) *SQEntry {
return (*SQEntry)(unsafe.Pointer(uintptr(sa) + idx*_sz_sqe))
}
func (sa sqeArray) Set(idx uintptr, v SQEntry) {
*sa.Get(idx) = v
}
//
//-- CQ
type CQRing struct {
head uintptr
tail uintptr
ringMask uintptr
ringEntries uintptr
cqes cqeArray
}
func (cq CQRing) Get(idx uint32) *CQEntry {
if uintptr(idx) >= uintptr(*cq.RingEntries()) { // avoid lookup overflow
return nil
}
return cq.cqes.Get(uintptr(idx))
}
func (cq CQRing) Head() *uint32 {
return (*uint32)(unsafe.Pointer(cq.head))
}
func (cq CQRing) Tail() *uint32 {
return (*uint32)(unsafe.Pointer(cq.tail))
}
func (cq CQRing) RingMask() *uint32 {
return (*uint32)(unsafe.Pointer(cq.ringMask))
}
func (cq CQRing) RingEntries() *uint32 {
return (*uint32)(unsafe.Pointer(cq.ringEntries))
}
func (cq CQRing) Event() cqeArray {
return cq.cqes
}
//
type cqeArray uintptr
func (ca cqeArray) Get(idx uintptr) *CQEntry {
return (*CQEntry)(unsafe.Pointer(uintptr(ca) + idx*_sz_cqe))
}
func (ca cqeArray) Set(idx uintptr, v CQEntry) {
*ca.Get(idx) = v
}

103
ring_entry.go
View file

@ -1,103 +0,0 @@
package gouring
import (
"reflect"
"unsafe"
)
var (
_sqe = SQEntry{}
_sqe_mm = make([]byte, _sz_sqe)
_sz_sqe = unsafe.Sizeof(_sqe)
_cqe = CQEntry{}
_cqe_mm = make([]byte, _sz_cqe)
_sz_cqe = unsafe.Sizeof(_cqe)
)
//-- SQEntry
type SQEntry struct {
Opcode UringOpcode
Flags UringSQEFlag
Ioprio uint16
Fd int32
off__addr2 uint64 // union { off, addr2 }
addr__splice_off_in uint64 // union { addr, splice_off_in }
Len uint32
opcode__flags_events uint32 // union of events and flags for opcode
UserData uint64
buf__index_group uint16 // union {buf_index, buf_group}
Personality uint16
splice_fd_in__file_index int32 // union { __s32 splice_fd_in, __u32 file_index }
pad2 [2]uint64
}
func (sqe *SQEntry) Offset() *uint64 {
return &sqe.off__addr2
}
func (sqe *SQEntry) SetOffset(v uint64) {
*sqe.Offset() = v
}
func (sqe *SQEntry) Addr2() *uint64 {
return &sqe.off__addr2
}
func (sqe *SQEntry) SetAddr2(v interface{}) {
*sqe.Addr2() = (uint64)(reflect.ValueOf(v).Pointer())
}
func (sqe *SQEntry) Addr() *uint64 {
return &sqe.addr__splice_off_in
}
func (sqe *SQEntry) SetAddr(v interface{}) {
*sqe.Addr() = (uint64)(reflect.ValueOf(v).Pointer())
}
func (sqe *SQEntry) SpliceOffIn() *uint64 {
return &sqe.addr__splice_off_in
}
func (sqe *SQEntry) OpcodeFlags() *uint32 {
return &sqe.opcode__flags_events
}
func (sqe *SQEntry) OpodeEvents() *uint32 {
return &sqe.opcode__flags_events
}
func (sqe *SQEntry) BufIndex() *uint16 {
return &sqe.buf__index_group
}
func (sqe *SQEntry) BufGroup() *uint16 {
return &sqe.buf__index_group
}
func (sqe *SQEntry) SpliceFdIn() *int32 {
return &sqe.splice_fd_in__file_index
}
func (sqe *SQEntry) FileIndex() *uint32 {
return (*uint32)(unsafe.Pointer(&sqe.splice_fd_in__file_index))
}
//
func (sqe *SQEntry) Reset() {
*sqe = _sqe
}
//-- CQEntry
type CQEntry struct {
UserData uint64 /* sqe->data submission passed back */
Res int32 /* result code for this event */
Flags UringCQEFlag
}
func (cqe *CQEntry) Reset() {
*cqe = _cqe
}

140
setup.go Normal file
View file

@ -0,0 +1,140 @@
package gouring
import (
"syscall"
"unsafe"
)
// func io_uring_queue_init(entries uint32, ring *IoUring, flags uint32) error {
// p := new(IoUringParams)
// p.Flags = flags
// return io_uring_queue_init_params(entries, ring, p)
// }
func io_uring_queue_init_params(entries uint32, ring *IoUring, p *IoUringParams) error {
fd, err := io_uring_setup(uintptr(entries), p)
if err != nil {
return err
}
err = io_uring_queue_mmap(fd, p, ring)
if err != nil {
return err
}
ring.Features = p.Features
return nil
}
func (ring *IoUring) io_uring_queue_exit() {
sq := &ring.Sq
cq := &ring.Cq
sqeSize := SizeofIoUringSqe
if ring.Flags&IORING_SETUP_SQE128 != 0 {
sqeSize += 64
}
munmap(unsafe.Pointer(sq.Sqes), sqeSize*uintptr(*sq._RingEntries()))
io_uring_unmap_rings(sq, cq)
/*
* Not strictly required, but frees up the slot we used now rather
* than at process exit time.
*/
if ring.IntFlags&INT_FLAG_REG_RING != 0 {
ring.io_uring_unregister_ring_fd()
}
syscall.Close(int(ring.RingFd))
}
func io_uring_queue_mmap(fd int, p *IoUringParams, ring *IoUring) error {
err := io_uring_mmap(fd, p, &ring.Sq, &ring.Cq)
if err != nil {
return err
}
ring.Flags = p.Flags
ring.RingFd, ring.EnterRingFd = fd, fd
ring.IntFlags = 0
return nil
}
func io_uring_mmap(fd int, p *IoUringParams, sq *IoUringSq, cq *IoUringCq) (err error) {
size := SizeofIoUringCqe
if p.Flags&IORING_SETUP_CQE32 != 0 {
size += SizeofIoUringCqe
}
sq.RingSz = p.SqOff.Array + p.SqEntries*uint32(SizeofUnsigned)
cq.RingSz = p.CqOff.Cqes + p.CqEntries*uint32(size)
if p.Features&IORING_FEAT_SINGLE_MMAP != 0 {
if cq.RingSz > sq.RingSz {
sq.RingSz = cq.RingSz
}
// cq.RingSz = sq.RingSz
}
// alloc sq ring
sq.RingPtr, err = mmap(nil, uintptr(sq.RingSz),
syscall.PROT_READ|syscall.PROT_WRITE,
syscall.MAP_SHARED|syscall.MAP_POPULATE,
fd, IORING_OFF_SQ_RING)
if err != nil {
return
}
if p.Features&IORING_FEAT_SINGLE_MMAP != 0 {
cq.RingPtr = sq.RingPtr
} else {
// alloc cq ring
cq.RingPtr, err = mmap(nil, uintptr(cq.RingSz),
syscall.PROT_READ|syscall.PROT_WRITE,
syscall.MAP_SHARED|syscall.MAP_POPULATE,
fd, IORING_OFF_CQ_RING)
if err != nil {
// goto errLabel
io_uring_unmap_rings(sq, cq)
return
}
}
//sq
sq.head = (unsafe.Pointer(uintptr(sq.RingPtr) + uintptr(p.SqOff.Head)))
sq.tail = (unsafe.Pointer(uintptr(sq.RingPtr) + uintptr(p.SqOff.Tail)))
sq.ringMask = (unsafe.Pointer(uintptr(sq.RingPtr) + uintptr(p.SqOff.RingMask)))
sq.ringEntries = (unsafe.Pointer(uintptr(sq.RingPtr) + uintptr(p.SqOff.RingEntries)))
sq.flags = (unsafe.Pointer(uintptr(sq.RingPtr) + uintptr(p.SqOff.Flags)))
sq.dropped = (unsafe.Pointer(uintptr(sq.RingPtr) + uintptr(p.SqOff.Dropped)))
sq.Array = (uint32Array)(unsafe.Pointer(uintptr(sq.RingPtr) + uintptr(p.SqOff.Array)))
size = SizeofIoUringSqe
if p.Flags&IORING_SETUP_SQE128 != 0 {
size += 64
}
var sqeAddr unsafe.Pointer
sqeAddr, err = mmap(nil, size*uintptr(p.SqEntries),
syscall.PROT_READ|syscall.PROT_WRITE,
syscall.MAP_SHARED|syscall.MAP_POPULATE,
fd, IORING_OFF_SQES)
if err != nil {
//errLabel:
io_uring_unmap_rings(sq, cq)
return
}
sq.Sqes = (ioUringSqeArray)(sqeAddr)
//cq
cq.head = (unsafe.Pointer(uintptr(cq.RingPtr) + uintptr(p.CqOff.Head)))
cq.tail = (unsafe.Pointer(uintptr(cq.RingPtr) + uintptr(p.CqOff.Tail)))
cq.ringMask = (unsafe.Pointer(uintptr(cq.RingPtr) + uintptr(p.CqOff.RingMask)))
cq.ringEntries = (unsafe.Pointer(uintptr(cq.RingPtr) + uintptr(p.CqOff.RingEntries)))
cq.overflow = (unsafe.Pointer(uintptr(cq.RingPtr) + uintptr(p.CqOff.Overflow)))
cq.Cqes = (ioUringCqeArray)(unsafe.Pointer(uintptr(cq.RingPtr) + uintptr(p.CqOff.Cqes)))
if p.CqOff.Flags != 0 {
cq.flags = (unsafe.Pointer(uintptr(cq.RingPtr) + uintptr(p.CqOff.Flags)))
}
return nil
}
func io_uring_unmap_rings(sq *IoUringSq, cq *IoUringCq) error {
munmap(sq.RingPtr, uintptr(sq.RingSz))
if cq.RingPtr != nil && cq.RingPtr != sq.RingPtr {
munmap(cq.RingPtr, uintptr(cq.RingSz))
}
return nil
}

11
sigset.go
View file

@ -5,12 +5,11 @@ import (
) )
const ( const (
_uint64 uint64 = 0 SizeofUint64 = unsafe.Sizeof(uint64(0))
_sz_uint64 = unsafe.Sizeof(_uint64) SIGSET_NWORDS = (1024 / (8 * SizeofUint64))
SIGSET_NWORDS = (1024 / (8 * _sz_uint64)) SIGTMIN = 32
SIGTMIN = 32 SIGTMAX = SIGTMIN
SIGTMAX = SIGTMIN NSIG = (SIGTMAX + 1)
NSIG = (SIGTMAX + 1)
) )
type Sigset_t struct { type Sigset_t struct {

63
syscall.go Normal file
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package gouring
import (
"syscall"
"unsafe"
)
func io_uring_setup(entries uintptr, params *IoUringParams) (ret int, err error) {
r1, _, e1 := syscall.Syscall(SYS_IO_URING_SETUP, entries, uintptr(unsafe.Pointer(params)), 0)
ret = int(r1)
if e1 < 0 {
err = e1
}
return
}
func io_uring_enter(fd int, toSubmit uint32, minComplete uint32, flags uint32, sig *Sigset_t) (ret int, err error) {
return io_uring_enter2(fd, toSubmit, minComplete, flags, sig, NSIG/8)
}
// TODO: decide to use Syscall or RawSyscall
func io_uring_enter2(fd int, toSubmit uint32, minComplete uint32, flags uint32, sig *Sigset_t, sz int32) (ret int, err error) {
r1, _, e1 := syscall.Syscall6(SYS_IO_URING_ENTER,
uintptr(fd),
uintptr(toSubmit), uintptr(minComplete),
uintptr(flags), uintptr(unsafe.Pointer(sig)), uintptr(sz))
ret = int(r1)
if e1 != 0 {
err = e1
}
return
}
func io_uring_register(fd int, opcode uint32, arg unsafe.Pointer, nrArgs uintptr) (ret int, err error) {
r1, _, e1 := syscall.Syscall6(SYS_IO_URING_REGISTER, uintptr(fd), uintptr(opcode), uintptr(arg), uintptr(nrArgs), 0, 0)
ret = int(r1)
if e1 != 0 {
err = e1
}
return
}
//go:linkname mmap syscall.mmap
func mmap(addr unsafe.Pointer, length uintptr, prot int, flags int, fd int, offset int64) (xaddr unsafe.Pointer, err error)
//go:linkname munmap syscall.munmap
func munmap(addr unsafe.Pointer, length uintptr) (err error)
//
func increase_rlimit_nofile(nr uint64) error {
var rlim syscall.Rlimit
err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rlim)
if err != nil {
return err
}
if rlim.Cur < nr {
rlim.Cur += nr
err = syscall.Setrlimit(syscall.RLIMIT_NOFILE, &rlim)
}
return err
}

9
syscall_nr_amd64.go Normal file
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package gouring
const (
// uring syscall no.
SYS_IO_URING_SETUP = 425
SYS_IO_URING_ENTER = 426
SYS_IO_URING_REGISTER = 427
)

86
sysnum.go
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@ -1,86 +0,0 @@
package gouring
import (
"syscall"
"unsafe"
)
const (
SYS_IO_URING_SETUP = 425
SYS_IO_URING_ENTER = 426
SYS_IO_URING_REGISTER = 427
)
//go:linkname errnoErr syscall.errnoErr
func errnoErr(e syscall.Errno) error
type SQOffsets struct {
Head uint32
Tail uint32
RingMask uint32
RingEntries uint32
Flags uint32
Dropped uint32
Array uint32
Resv1 uint32
Resv2 uint64
}
type CQOffsets struct {
Head uint32
Tail uint32
RingMask uint32
RingEntries uint32
Overflow uint32
CQEs uint32
Flags uint32
Resv1 uint32
Resv2 uint64
}
type IOUringParams struct {
SQEntries uint32 // sq_entries
CQEntries uint32 // cq_entries
Flags UringSetupFlag // flags
SQThreadCPU uint32 // sq_thread_cpu
SQThreadIdle uint32 // sq_threead_idle
Features UringParamFeatureFlag // features
WQFd uint32 // wq_fd
resv [3]uint32 // resv
SQOff SQOffsets // sq_off
CQOff CQOffsets // cq_off
}
//go:inline
func io_uring_setup(entries uint, params *IOUringParams) (fd int, err error) {
r1, _, e1 := syscall.Syscall(SYS_IO_URING_SETUP, uintptr(entries), uintptr(unsafe.Pointer(params)), 0)
fd = int(r1)
if e1 != 0 {
err = errnoErr(e1)
}
return
}
func io_uring_enter(ringFd int, toSubmit uint, minComplete uint, flags uint, sig *Sigset_t) (ret int, err error) {
return io_uring_enter2(ringFd, toSubmit, minComplete, flags, sig, NSIG/8)
}
func io_uring_enter2(ringFd int, toSubmit uint, minComplete uint, flags uint, sig *Sigset_t, sz int) (ret int, err error) {
r1, _, e1 := syscall.Syscall6(SYS_IO_URING_ENTER, uintptr(ringFd), uintptr(toSubmit), uintptr(minComplete), uintptr(flags), uintptr(unsafe.Pointer(sig)), uintptr(sz))
ret = int(r1)
if e1 != 0 {
err = errnoErr(e1)
}
return
}
func io_uring_register(ringFd int, opcode uint /*const*/, arg uintptr, nrArgs uint) (ret int, err error) {
r1, _, e1 := syscall.Syscall6(SYS_IO_URING_REGISTER, uintptr(ringFd), uintptr(opcode), arg, uintptr(nrArgs), 0, 0)
ret = int(r1)
if e1 != 0 {
err = errnoErr(e1)
}
return
}

48
uring.go Normal file
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package gouring
func New(entries uint32, flags uint32) (*IoUring, error) {
ring := &IoUring{}
p := new(IoUringParams)
p.Flags = flags
err := io_uring_queue_init_params(entries, ring, p)
if err != nil {
return nil, err
}
return ring, nil
}
func NewWithParams(entries uint32, params *IoUringParams) (*IoUring, error) {
ring := &IoUring{}
if params == nil {
params = new(IoUringParams)
}
err := io_uring_queue_init_params(entries, ring, params)
if err != nil {
return nil, err
}
return ring, nil
}
func (h *IoUring) Close() {
h.io_uring_queue_exit()
}
func (h *IoUring) GetSqe() *IoUringSqe {
return h.io_uring_get_sqe()
}
func (h *IoUring) WaitCqe(cqePtr **IoUringCqe) error {
return h.io_uring_wait_cqe(cqePtr)
}
func (h *IoUring) SeenCqe(cqe *IoUringCqe) {
h.io_uring_cqe_seen(cqe)
}
func (h *IoUring) Submit() (int, error) {
return h.io_uring_submit()
}
func (h *IoUring) SubmitAndWait(waitNr uint32) (int, error) {
return h.io_uring_submit_and_wait(waitNr)
}

81
uring_bench_test.go Normal file
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package gouring
import (
"context"
"runtime"
"syscall"
"testing"
)
func BenchmarkQueueNop(b *testing.B) {
type opt struct {
name string
entries uint32
p IoUringParams
}
ts := []opt{
{"def-256", 256, IoUringParams{Flags: 0}},
{"sqpoll-256-4-10000", 256, IoUringParams{Flags: IORING_SETUP_SQPOLL, SqThreadCpu: 16, SqThreadIdle: 10_000}},
}
consumer := func(h *IoUring, ctx context.Context, count int) {
var cqe *IoUringCqe
var err error
for i := 0; i < count; i++ {
if ctx.Err() != nil {
return
}
err = h.WaitCqe(&cqe)
if err == syscall.EINTR {
continue // ignore INTR
} else if err != nil {
panic(err)
}
if cqe.Res < 0 {
panic(syscall.Errno(-cqe.Res))
}
h.SeenCqe(cqe)
}
}
for _, tc := range ts {
b.Run(tc.name, func(b *testing.B) {
h := testNewIoUringWithParams(b, tc.entries, &tc.p)
defer h.Close()
var (
j uint32
sqe *IoUringSqe
err error
submitted int
)
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
b.ResetTimer()
for i := 0; i < b.N; i++ {
for j = 0; j < tc.entries; j++ {
for {
// sqe could be nil if SQ is already full so we spin until we got one
sqe = h.GetSqe()
if sqe != nil {
break
}
runtime.Gosched()
}
PrepNop(sqe)
sqe.UserData.SetUint64(uint64(i + int(j)))
}
submitted, err = h.Submit()
if err != nil {
panic(err)
}
consumer(h, ctx, submitted)
}
b.StopTimer()
})
}
}

64
uring_test.go Normal file
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package gouring
import (
"bytes"
"os"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
type genericTestingT interface {
assert.TestingT
require.TestingT
}
func testNewIoUring(t genericTestingT, entries uint32, flags uint32) *IoUring {
h, err := New(entries, flags)
require.NoError(t, err)
require.NotNil(t, h)
return h
}
func testNewIoUringWithParams(t genericTestingT, entries uint32, p *IoUringParams) *IoUring {
h, err := NewWithParams(entries, p)
require.NoError(t, err)
require.NotNil(t, h)
return h
}
func TestRingWrapper(t *testing.T) {
h := testNewIoUring(t, 256, 0)
defer h.Close()
// O_RDWR|O_CREATE|O_EXCL
ftmp, err := os.CreateTemp(os.TempDir(), "test_iouring_ring_wrapper_*")
require.NoError(t, err)
fd := ftmp.Fd()
var whatToWrite = [][]byte{
[]byte("hello\n"),
[]byte("\tworld\n\n"),
[]byte("io_uring\t\t\n"),
[]byte("nice!\n!!!\n\x00"),
}
var off uint64 = 0
for _, bs := range whatToWrite {
sqe := h.GetSqe()
PrepWrite(sqe, int(fd), &bs[0], len(bs), off)
sqe.Flags = IOSQE_IO_LINK
off = off + uint64(len(bs))
}
submitted, err := h.SubmitAndWait(uint32(len(whatToWrite)))
require.NoError(t, err)
require.Equal(t, len(whatToWrite), int(submitted))
var readed = make([]byte, 1024)
nb, err := ftmp.Read(readed)
assert.NoError(t, err)
readed = readed[:nb]
joined := bytes.Join(whatToWrite, []byte{})
assert.Equal(t, joined, readed)
}

96
util_ptr_arith.go Normal file
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package gouring
import (
"unsafe"
)
type uint32Array = unsafe.Pointer // *uint32
func uint32Array_Index(u uint32Array, i uintptr) *uint32 {
return (*uint32)(unsafe.Pointer(uintptr(unsafe.Pointer(u)) + SizeofUint32*i))
}
type ioUringSqeArray = unsafe.Pointer // *IoUringSqe
func ioUringSqeArray_Index(u ioUringSqeArray, i uintptr) *IoUringSqe {
return (*IoUringSqe)(unsafe.Pointer(uintptr(unsafe.Pointer(u)) + SizeofIoUringSqe*i))
}
func ioUringSqe128Array_Index(u ioUringSqeArray, i uintptr) *IoUringSqe {
return (*IoUringSqe)(unsafe.Pointer(uintptr(unsafe.Pointer(u)) + (SizeofIoUringSqe+64)*i))
}
//
type ioUringCqeArray = unsafe.Pointer // *IoUringCqe
func ioUringCqeArray_Index(u ioUringCqeArray, i uintptr) *IoUringCqe {
return (*IoUringCqe)(unsafe.Pointer(uintptr(unsafe.Pointer(u)) + SizeofIoUringCqe*i))
}
func ioUringCqe32Array_Index(u ioUringCqeArray, i uintptr) *IoUringCqe {
return (*IoUringCqe)(unsafe.Pointer(uintptr(unsafe.Pointer(u)) + (SizeofIoUringCqe+SizeofIoUringCqe)*i))
}
//
type UserData [8]byte // uint64
func (u *UserData) SetUint64(v uint64) {
putUintptr(unsafe.Pointer(u), uintptr(v))
}
func (u *UserData) SetUintptr(v uintptr) {
putUintptr(unsafe.Pointer(u), v)
}
func (u *UserData) SetUnsafe(ptr unsafe.Pointer) {
putUnsafe(unsafe.Pointer(u), ptr)
}
func (u UserData) GetUnsafe() unsafe.Pointer {
return *(*unsafe.Pointer)(unsafe.Pointer(&u))
}
func (u UserData) GetUintptr() uintptr {
return uintptr(u.GetUnsafe())
}
func (u UserData) GetUint64() uint64 {
return uint64(u.GetUintptr())
}
func (u UserData) IsZero() bool {
return u.GetUintptr() == 0
}
// ---
func putUnsafe(ptr unsafe.Pointer, v unsafe.Pointer) {
*(*unsafe.Pointer)(ptr) = v
}
func putUintptr(ptr unsafe.Pointer, v uintptr) {
*(*uintptr)(ptr) = v
}
func putUint64(ptr unsafe.Pointer, v uint64) {
*(*uint64)(ptr) = v
}
func putUint32(ptr unsafe.Pointer, v uint32) {
*(*uint32)(ptr) = v
}
func putUint16(ptr unsafe.Pointer, v uint16) {
*(*uint16)(ptr) = v
}
func putUint8(ptr unsafe.Pointer, v uint8) {
*(*uint8)(ptr) = v
}
func putInt64(ptr unsafe.Pointer, v int64) {
*(*int64)(ptr) = v
}
func putInt32(ptr unsafe.Pointer, v int32) {
*(*int32)(ptr) = v
}
func putInt16(ptr unsafe.Pointer, v int16) {
*(*int16)(ptr) = v
}
func putInt8(ptr unsafe.Pointer, v int8) {
*(*int8)(ptr) = v
}

44
util_ptr_arith_test.go Normal file
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package gouring
import (
"encoding/binary"
"fmt"
"testing"
"unsafe"
"github.com/stretchr/testify/assert"
)
func TestUserdata(t *testing.T) {
type test struct {
v any
exp uint64
}
ts := []test{
{uint64(0), 0},
{uint64(0xff), 0xff},
{uint64(0xfffefd), 0xfffefd},
{uintptr(0xcafeba), 0xcafeba},
{unsafe.Pointer(nil), 0},
}
bo := binary.LittleEndian
for _, tc := range ts {
var u UserData
switch v := tc.v.(type) {
case uint64:
u.SetUint64(v)
case uintptr:
u.SetUintptr(v)
case unsafe.Pointer:
u.SetUnsafe(v)
default:
panic(fmt.Sprintf("unhandled type: %T", v))
}
assert.Equal(t, tc.exp, u.GetUint64())
var exp [8]byte
bo.PutUint64(exp[:], tc.exp)
assert.Equal(t, exp[:], u[:])
}
}

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util_union.go Normal file
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package gouring
import "unsafe"
type union64 [8]byte
func (u *union64) PutUnsafe(v unsafe.Pointer) { putUnsafe(unsafe.Pointer(u), v) }
func (u *union64) PutUintptr(v uintptr) { putUintptr(unsafe.Pointer(u), v) }
func (u *union64) PutUint64(v uint64) { putUint64(unsafe.Pointer(u), v) }
func (u *union64) PutUint32(v uint32) { putUint32(unsafe.Pointer(u), v) }
func (u *union64) PutUint16(v uint16) { putUint16(unsafe.Pointer(u), v) }
func (u *union64) PutUint8(v uint8) { putUint8(unsafe.Pointer(u), v) }
func (u *union64) PutInt32(v int32) { putInt32(unsafe.Pointer(u), v) }
func (u *union64) Unsafe() unsafe.Pointer { return unsafe.Pointer(u) }
func (u *union64) Uint64() uint64 { return *(*uint64)(unsafe.Pointer(u)) }
func (u *union64) Uint32() uint32 { return *(*uint32)(unsafe.Pointer(u)) }
func (u *union64) Uint16() uint16 { return *(*uint16)(unsafe.Pointer(u)) }
func (u *union64) Uint8() uint8 { return *(*uint8)(unsafe.Pointer(u)) }
type union32 [4]byte
func (u *union32) PutUnsafe(v unsafe.Pointer) { putUnsafe(unsafe.Pointer(u), v) }
func (u *union32) PutUintptr(v uintptr) { putUintptr(unsafe.Pointer(u), uintptr(uint32(v))) }
func (u *union32) PutUint64(v uint64) { putUint32(unsafe.Pointer(u), uint32(v)) }
func (u *union32) PutUint32(v uint32) { putUint32(unsafe.Pointer(u), v) }
func (u *union32) PutUint16(v uint16) { putUint16(unsafe.Pointer(u), v) }
func (u *union32) PutUint8(v uint8) { putUint8(unsafe.Pointer(u), v) }
func (u *union32) PutInt32(v int32) { putInt32(unsafe.Pointer(u), v) }
func (u *union32) Unsafe() unsafe.Pointer { return unsafe.Pointer(u) }
func (u *union32) Uint64() uint64 { return *(*uint64)(unsafe.Pointer(u)) }
func (u *union32) Uint32() uint32 { return *(*uint32)(unsafe.Pointer(u)) }
func (u *union32) Uint16() uint16 { return *(*uint16)(unsafe.Pointer(u)) }
func (u *union32) Uint8() uint8 { return *(*uint8)(unsafe.Pointer(u)) }
type union16 [2]byte
func (u *union16) PutUnsafe(v unsafe.Pointer) { putUnsafe(unsafe.Pointer(u), v) }
func (u *union16) PutUintptr(v uintptr) { putUintptr(unsafe.Pointer(u), uintptr(uint16(v))) }
func (u *union16) PutUint64(v uint64) { putUint16(unsafe.Pointer(u), uint16(v)) }
func (u *union16) PutUint32(v uint32) { putUint16(unsafe.Pointer(u), uint16(v)) }
func (u *union16) PutUint16(v uint16) { putUint16(unsafe.Pointer(u), v) }
func (u *union16) PutUint8(v uint8) { putUint8(unsafe.Pointer(u), v) }
func (u *union16) Unsafe() unsafe.Pointer { return unsafe.Pointer(u) }
func (u *union16) Uint64() uint64 { return *(*uint64)(unsafe.Pointer(u)) }
func (u *union16) Uint32() uint32 { return *(*uint32)(unsafe.Pointer(u)) }
func (u *union16) Uint16() uint16 { return *(*uint16)(unsafe.Pointer(u)) }
func (u *union16) Uint8() uint8 { return *(*uint8)(unsafe.Pointer(u)) }