[PATCH 2/2] virtio-net: Clarify the size of the struct virtio_net_hdr for tx

[Parav Pandit <parav@nvidia.com>]

The feature VIRTIO_NET_F_HASH_REPORT only applies to the receive side.
However, when VIRTIO_NET_F_HASH_REPORT feature was introduced, it was
not clarified that the size of the struct virtio_net_hdr on the packet
transmission also uses higher size when VIRTIO_NET_F_HASH_REPORT is
negotiated.

Explicitly clarify this.

Fixes: https://github.com/oasis-tcs/virtio-spec/issues/183
Signed-off-by: Parav Pandit <parav@nvidia.com>
---
 device-types/net/description.tex | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/device-types/net/description.tex b/device-types/net/description.tex
index f5647d4..00ea58d 100644
--- a/device-types/net/description.tex
+++ b/device-types/net/description.tex
@@ -531,6 +531,12 @@ \subsubsection{Packet Transmission}\label{sec:Device Types / Network Device / De
 
 \drivernormative{\paragraph}{Packet Transmission}{Device Types / Network Device / Device Operation / Packet Transmission}
 
+If VIRTIO_NET_F_HASH_REPORT is not negotiated, the size of the field
+\field{struct virtio_net_hdr} is 12 bytes.
+
+If VIRTIO_NET_F_HASH_REPORT is negotiated, the size of the field
+\field{struct virtio_net_hdr} is 20 bytes.
+
 The driver MUST set \field{num_buffers} to zero.
 
 If VIRTIO_NET_F_CSUM is not negotiated, the driver MUST set
-- 
2.34.1