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Subject: Re: [virtio-comment] [PATCH v4 1/1] virtio-net: Define per-packet hash reporting feature



On 2020/2/19 äå3:53, Yuri Benditovich wrote:
  The device MUST set \field{rss_max_indirection_table_length} to at least 128, if it offers
  VIRTIO_NET_F_RSS.
@@ -3195,6 +3180,8 @@ \subsection{Device Operation}\label{sec:Device Types / Network Device / Device O
          le16 csum_start;
          le16 csum_offset;
          le16 num_buffers;
+        le32 hash_value; (Only if VIRTIO_NET_F_HASH_REPORT negotiated)
+        le16 hash_type;  (Only if VIRTIO_NET_F_HASH_REPORT negotiated)
  };
  \end{lstlisting}


A question here:

Consider we introduce VIRTIO_NET_F_FEATURE_INFORMATION in the future:

le32 hash_type; // VIRTIO_NET_F_HASH_REPORT
le32 feature_information; // VIRTIO_NET_F_FEATURE_INFORMATION

What happens if HASH_REPORT is not negotiated, I believe we expect a stable ABI(offset) here for feature_information?

Thanks





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