From: Stephen Hemminger <stephen@networkplumber.org>
To: Yang Luan <luan.penny@gmail.com>
Cc: users@dpdk.org
Subject: Re: Wrong rx queue assignment running DPDK on Azure
Date: Fri, 4 Nov 2022 09:52:02 -0700 [thread overview]
Message-ID: <20221104095202.32c55020@hermes.local> (raw)
In-Reply-To: <CAPHT=bZ5Lbvs2ds6t94D93gumagGECbTSn116SgxHVk0SMu=_Q@mail.gmail.com>
On Tue, 1 Nov 2022 17:25:24 -0700
Yang Luan <luan.penny@gmail.com> wrote:
> Hello,
>
>
> Our application uses the net_netvsc driver in DPDK 21.08 on Azure. We found
> an issue where RSS doesn’t deliver packets to the correct rx queue. The
> instance type we use is Standard_L80s_v3 with MT27800 Family [ConnectX-5
> Virtual Function] NICs. The NIC is configured with 40 rx queues and the
> RETA table is configured (confirmed by rte_eth_dev_rss_reta_query()) as
> below.
>
>
>
> 0: 0 1 2 3 4 5 6 7
>
> 8: 8 9 10 11 12 13 14 15
>
> 16: 16 17 18 19 20 21 22 23
>
> 24: 24 25 26 27 28 29 30 31
>
> 32: 32 33 34 35 36 37 38 39
>
> 40: 0 1 2 3 4 5 6 7
>
> 48: 8 9 10 11 12 13 14 15
>
> 56: 16 17 18 19 20 21 22 23
>
> 64: 24 25 26 27 28 29 30 31
>
> 72: 32 33 34 35 36 37 38 39
>
> 80: 0 1 2 3 4 5 6 7
>
> 88: 8 9 10 11 12 13 14 15
>
> 96: 16 17 18 19 20 21 22 23
>
> 104: 24 25 26 27 28 29 30 31
>
> 112: 32 33 34 35 36 37 38 39
>
> 120: 0 1 2 3 4 5 6 7
>
>
>
> One example is a packet received with rss key 0xEDE25D84 was incorrectly
> delivered to rx queue 12. We expect it to be queue 4 as 0xEDE25D84 & 0x7F =
> 4 assuming seven of the least significant bits (LSBs) are used for indexing
> into the RETA table. Is it a bug or we made a wrong assumption on how the
> RETA table is accessed with that device?
>
>
> Thank you.
>
> Yang
Are you using failsafe PMD or the native netvsc PMD?
Are you programming reta table via DPDK or through other API's?
next prev parent reply other threads:[~2022-11-04 16:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-02 0:25 Yang Luan
2022-11-04 16:52 ` Stephen Hemminger [this message]
2022-11-04 17:15 ` Yang Luan
2022-11-04 22:18 ` Stephen Hemminger
2022-11-07 20:03 ` Yang Luan
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