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Use readv for the RX path of the network device to avoid one memory copy per frame #4799

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Merged
merged 5 commits into from
Oct 7, 2024
Merged

Use readv for the RX path of the network device to avoid one memory copy per frame #4799

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050ca03
virtio: add ring buffer type for describing guest memory
bchalios Sep 12, 2024
ba139b6
virtio: allow IoVecBufferMut to hold multiple DescriptorChain objects
bchalios Sep 12, 2024
a002874
net: use readv for reading frames from TAP device
bchalios Sep 12, 2024
91238d6
net: support serializing RxBuffer
bchalios Sep 27, 2024
7ce0211
iovec: fix kani proof for write_volatile_at
bchalios Oct 1, 2024
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102 changes: 102 additions & 0 deletions resources/seccomp/aarch64-unknown-linux-musl.json
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,108 @@
"syscall": "writev",
"comment": "Used by the VirtIO net device to write to tap"
},
{
"syscall": "readv",
"comment": "Used by the VirtIO net device to read from tap"
},
{
"syscall": "memfd_create",
"comment": "Used by the IovDeque implementation"
},
{
"syscall": "fcntl",
"comment": "Used by the IovDeque implementation",
"args": [
{
"index": 1,
"type": "dword",
"op": "eq",
"val": 1033,
"comment": "FCNTL_F_SETFD"
},
{
"index": 2,
"type": "dword",
"op": "eq",
"val": 6,
"comment": "F_SEAL_SHRINK|F_SEAL_GROW"
}
]
},
{
"syscall": "fcntl",
"comment": "Used by the IovDeque implementation",
"args": [
{
"index": 1,
"type": "dword",
"op": "eq",
"val": 1033,
"comment": "FCNTL_F_SETFD"
},
{
"index": 2,
"type": "dword",
"op": "eq",
"val": 1,
"comment": "F_SEAL_SEAL"
}
]
},
{
"syscall": "mmap",
"comment": "Used by the IovDeque implementation",
"args": [
{
"index": 1,
"type": "dword",
"op": "eq",
"val": 4096,
"comment": "Page size allocation"
},
{
"index": 2,
"type": "dword",
"op": "eq",
"val": 3,
"comment": "PROT_READ|PROT_WRITE"
},
{
"index": 3,
"type": "dword",
"op": "eq",
"val": 17,
"comment": "MAP_SHARED|MAP_FIXED"
}
]
},
{
"syscall": "mmap",
"comment": "Used by the IovDeque implementation",
"args": [
{
"index": 1,
"type": "dword",
"op": "eq",
"val": 8192,
"comment": "2 pages allocation"
},
{
"index": 2,
"type": "dword",
"op": "eq",
"val": 0,
"comment": "PROT_NONE"
},
{
"index": 3,
"type": "dword",
"op": "eq",
"val": 34,
"comment": "MAP_PRIVATE|MAP_ANONYMOUS"
}
]
},
{
"syscall": "fsync"
},
Expand Down
102 changes: 102 additions & 0 deletions resources/seccomp/x86_64-unknown-linux-musl.json
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,108 @@
"syscall": "writev",
"comment": "Used by the VirtIO net device to write to tap"
},
{
"syscall": "readv",
"comment": "Used by the VirtIO net device to read from tap"
},
{
"syscall": "memfd_create",
"comment": "Used by the IovDeque implementation"
},
{
"syscall": "fcntl",
"comment": "Used by the IovDeque implementation",
"args": [
{
"index": 1,
"type": "dword",
"op": "eq",
"val": 1033,
"comment": "FCNTL_F_SETFD"
},
{
"index": 2,
"type": "dword",
"op": "eq",
"val": 6,
"comment": "F_SEAL_SHRINK|F_SEAL_GROW"
}
]
},
{
"syscall": "fcntl",
"comment": "Used by the IovDeque implementation",
"args": [
{
"index": 1,
"type": "dword",
"op": "eq",
"val": 1033,
"comment": "FCNTL_F_SETFD"
},
{
"index": 2,
"type": "dword",
"op": "eq",
"val": 1,
"comment": "F_SEAL_SEAL"
}
]
},
{
"syscall": "mmap",
"comment": "Used by the IovDeque implementation",
"args": [
{
"index": 1,
"type": "dword",
"op": "eq",
"val": 4096,
"comment": "Page size allocation"
},
{
"index": 2,
"type": "dword",
"op": "eq",
"val": 3,
"comment": "PROT_READ|PROT_WRITE"
},
{
"index": 3,
"type": "dword",
"op": "eq",
"val": 17,
"comment": "MAP_SHARED|MAP_FIXED"
}
]
},
{
"syscall": "mmap",
"comment": "Used by the IovDeque implementation",
"args": [
{
"index": 1,
"type": "dword",
"op": "eq",
"val": 8192,
"comment": "2 pages allocation"
},
{
"index": 2,
"type": "dword",
"op": "eq",
"val": 0,
"comment": "PROT_NONE"
},
{
"index": 3,
"type": "dword",
"op": "eq",
"val": 34,
"comment": "MAP_PRIVATE|MAP_ANONYMOUS"
}
]
},
{
"syscall": "fsync"
},
Expand Down
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