* Hash rss value with mprq_en=1 device parameter
@ 2022-02-22 13:39 Дмитрий Степанов
2022-02-23 10:48 ` Dmitry Kozlyuk
0 siblings, 1 reply; 2+ messages in thread
From: Дмитрий Степанов @ 2022-02-22 13:39 UTC (permalink / raw)
To: users
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Hi folks!
I'm using Mellanox ConnectX-6 Dx EN adapter card (100GbE; Dual-port QSFP56;
PCIe 4.0/3.0 x16) with DPDK 21.11.
I'm setting mprq_en=1 device parameter to increase rx performance. But in
that case, rte_mbuf's field `hash.rss` of the received frame is zero and
`RTE_MBUF_F_RX_RSS_HASH` flag of field `ol_flags` is not set.
Without mprq_en=1 i get valid `hash.rss` value and flag
`RTE_MBUF_F_RX_RSS_HASH` is set.
Is there any way to get valid `hash.rss` value with mprq_en=1?
Thanks,
Dmitriy Stepanov
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Hash rss value with mprq_en=1 device parameter
2022-02-22 13:39 Hash rss value with mprq_en=1 device parameter Дмитрий Степанов
@ 2022-02-23 10:48 ` Dmitry Kozlyuk
0 siblings, 0 replies; 2+ messages in thread
From: Dmitry Kozlyuk @ 2022-02-23 10:48 UTC (permalink / raw)
To: Дмитрий
Степанов
Cc: users
Looks like a case described in PMD docs
(https://doc.dpdk.org/guides/nics/mlx5.html):
If Multi-Packet Rx queue is configured (mprq_en) and Rx CQE compression
is enabled (rxq_cqe_comp_en) at the same time, RSS hash result is not
fully supported. Some Rx packets may not have RTE_MBUF_F_RX_RSS_HASH.
I recommend checking that page in general, because mlx5 PMD supports many
features, but not all combinations of them.
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