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tcp: Add a new kernel-only TCP_USE_DDP socket option
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Authored by jhb on Feb 21 2024, 12:55 AM.
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Details

Summary

This socket option can be used by in-kernel consumers (like NFS) to
request a NIC to use optimized receive of large buffers for a
connection. The current use case is to support DDP by the TOE on
Chelsio NICs.

Sponsored by: Chelsio Communications

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I also considered adding this as a protocol-independent socket option (SO_DDP) but that is somewhat annoying when it comes to implementation in the next patch in the series as the TOE module only really gets to hook pr_ctloutput and socket-level options don't invoke that hook normally.

This revision is now accepted and ready to land.Feb 21 2024, 8:01 AM

btw, I'm getting close to divorce unix(4) from soreceive_generic/sosend_generic. That means the functions are left for TCP and a few leftovers (rtsock, bluetooth). The plan to create tcp_soreceive() and tcp_sosend() that will not carry any code for other sockets and would be much easier to extend.