[dpdk-dev] [PATCH] doc: add mlx5 limitation of RSS hash result

Yongseok Koh yskoh at mellanox.com
Tue Aug 14 18:57:47 CEST 2018


Signed-off-by: Yongseok Koh <yskoh at mellanox.com>
---
 doc/guides/nics/mlx5.rst | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/doc/guides/nics/mlx5.rst b/doc/guides/nics/mlx5.rst
index 52e1213cf5..cbcc233d03 100644
--- a/doc/guides/nics/mlx5.rst
+++ b/doc/guides/nics/mlx5.rst
@@ -136,6 +136,12 @@ Limitations
   enabled (``rxq_cqe_comp_en``) at the same time, RSS hash result is not fully
   supported. Some Rx packets may not have PKT_RX_RSS_HASH.
 
+- In general, PKT_RX_RSS_HASH shall be set in a received mbuf if RSS is enabled
+  and the packet is subject to hash cacalculation. However, in case of
+  vectorized Rx (``rx_vec_en``), PKT_RX_RSS_HASH will always be set as long as
+  RSS is enabled. Zero hash result (mbuf->hash.rss) means the packet isn't
+  subject to the configured RSS hash type and the flag should be disregarded.
+
 Statistics
 ----------
 
-- 
2.11.0



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