tree 527d61c002d683a29370975f1906b1b6c830f312
parent da3e9d5e793e0c8ca838c12416d431352808b49b
author Bhasker Hariharan <bhaskerh@google.com> 1585964088 -0700
committer gVisor bot <gvisor-bot@google.com> 1585964155 -0700

Refactor software GSO code.

Software GSO implementation currently has a complicated code path with
implicit assumptions that all packets to WritePackets carry same Data
and it does this to avoid allocations on the path etc. But this makes it
hard to reuse the WritePackets API.

This change breaks all such assumptions by introducing a new Vectorised
View API ReadToVV which can be used to cleanly split a VV into multiple
independent VVs. Further this change also makes packet buffers linkable
to form an intrusive list. This allows us to get rid of the array of
packet buffers that are passed in the WritePackets API call and replace
it with a list of packet buffers.

While this code does introduce some more allocations in the benchmarks
it doesn't cause any degradation.

Updates #231

PiperOrigin-RevId: 304731742