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Subject: [PATCH v3] vsock: add documentation about len header field

Signed-off-by: Laura Loghin <lauralg@amazon.com>
 virtio-vsock.tex | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/virtio-vsock.tex b/virtio-vsock.tex
index d79984d..1d6579b 100644
--- a/virtio-vsock.tex
+++ b/virtio-vsock.tex
@@ -107,6 +107,11 @@ \subsection{Device Operation}\label{sec:Device Types / Socket Device / Device Op
+\field{len} is the size of the payload, in bytes. However, the driver may
+provide buffer(s) for the payload that have a total size longer than
+\field{len}, in which case only the first \field{len} bytes will be used for
+the actual data.
 \subsubsection{Virtqueue Flow Control}\label{sec:Device Types / Socket Device / Device Operation / Virtqueue Flow Control}
 The tx virtqueue carries packets initiated by applications and replies to

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