netdev - MSG_ZEROCOPY

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Date:   Sun, 8 Nov 2020 17:04:41 +0000
From:   Victor Stewart <v@...etag.social>
To:     netdev@...r.kernel.org
Subject: MSG_ZEROCOPY_FIXED

hi all,

i'm seeking input / comment on the idea of implementing full fledged
zerocopy UDP networking that uses persistent buffers allocated in
userspace... before I go off on a solo tangent with my first patches
lol.

i'm sure there's been lots of thought/discussion on this before. of
course Willem added MSG_ZEROCOPY on the send path (pin buffers on
demand / per send). and something similar to what I speak of exists
with TCP_ZEROCOPY_RECEIVE.

i envision something like a new flag like MSG_ZEROCOPY_FIXED that
"does the right thing" in the send vs recv paths.

Victor