From: Yongseok Koh <yskoh@mellanox.com>
To: shahafs@mellanox.com
Cc: dev@dpdk.org, Yongseok Koh <yskoh@mellanox.com>
Subject: [dpdk-dev] [PATCH] doc: add mlx5 limitation of RSS hash result
Date: Tue, 14 Aug 2018 09:57:47 -0700 [thread overview]
Message-ID: <20180814165747.16148-1-yskoh@mellanox.com> (raw)
Signed-off-by: Yongseok Koh <yskoh@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
next reply other threads:[~2018-08-14 16:58 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-14 16:57 Yongseok Koh [this message]
2018-08-16 20:46 ` Yongseok Koh
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