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Overview
This PR adds a new crate for abstracting away direct interactions with cmsgs. It currently only contains implementations for Linux, but we can add multi-platform support when required.
Testing
Unit tests exist for basic functionality. As far as checking the success of GSO/GRO operations, I fired up a local server with a known GSO/GRO implementation. I then
strace
d 100 requests to the server onmaster
, filtering onsendmsg
/recvmsg
. Checking the number of syscalls, we see:I then substituted that GSO/GRO implementation with the one in this crate, and performed an identical test. The output is: