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foniod / redbpf

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Document which Rust types can be placed into eBPF maps

p-e-w
p-e-w commented May 23, 2021

It appears that the RedBPF toolchain imposes currently undocumented restrictions on map value types that go beyond those expressed by the generic constraints:

  • All variants of an enum must have the same size in memory.
  • Struct fields are (mostly?) required to be aligned to multiples of 32 bits, though sometimes 64-bit alignment is required, and some structs don't work at all despite their fi
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