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From: Carsten Andrich <carsten.andrich@tu-ilmenau.de>
To: Slava Ovsiienko <viacheslavo@nvidia.com>,
	NBU-Contact-Thomas Monjalon <thomas@monjalon.net>
Cc: "users@dpdk.org" <users@dpdk.org>
Subject: Re: [dpdk-users] MLX5: Using packet send scheduling / packet pacing
Date: Sat, 30 Jan 2021 11:54:40 +0100
Message-ID: <7a341d4b-5d39-7770-98a8-bd03ade463b3@tu-ilmenau.de> (raw)
In-Reply-To: <DM6PR12MB3753C91D5E4040B1C1594B78DFB99@DM6PR12MB3753.namprd12.prod.outlook.com>

Hi Slava,

thank you for the prompt response. I think the requirements for Packet 
Pacing should be added to Table 34.2(?) of the MLX5 docs [1].

Best regards,
Carsten

[1] https://doc.dpdk.org/guides/nics/mlx5.html#mlx5-offloads-support

On 29.01.21 19:04, Slava Ovsiienko wrote:
> Hi, Carsten
>
> To use packet pacing capability:
> - ConnectX-6DX or above is required
> - the NV settings should be configured (set timestamp to real-time UTC)
>
> With best regards,
> Slava
>
>> -----Original Message-----
>> From: Thomas Monjalon <thomas@monjalon.net>
>> Sent: Friday, January 29, 2021 18:50
>> To: Carsten Andrich <carsten.andrich@tu-ilmenau.de>
>> Cc: users@dpdk.org; Slava Ovsiienko <viacheslavo@nvidia.com>
>> Subject: Re: [dpdk-users] MLX5: Using packet send scheduling / packet pacing
>>
>> 29/01/2021 17:30, Carsten Andrich:
>>> Hello everyone,
>>>
>>> I'm trying to use packet send scheduling [1] with DPDK 20.11 and the
>>> MLX5 PMD (NIC: ConnectX-5 MCX516A-CDAT). This patch contains some
>>> additional information on this feature also know as packet pacing [2].
>>>
>>> According to MLX5's docs, packet pacing requires the "tx_pp" parameter
>>> [3, CTRL+F: "tx_pp"]. However, when firing up testpmd with that
>>> parameter, it fails as follows:
>>>
>>>> # dpdk-testpmd -a 81:00.0,tx_pp=500 -- -i ...
>>>> EAL: Probe PCI driver: mlx5_pci (15b3:1019) device: 0000:81:00.0
>>>> (socket 0)
>>>> mlx5_pci: WQE rate mode is required for packet pacing
>>>> mlx5_pci: probe of PCI device 0000:81:00.0 aborted after
>>>> encountering an error: No such device
>>>> common_mlx5: Failed to load driver = mlx5_pci.
>>>>
>>>> EAL: Requested device 0000:81:00.0 cannot be used
>>> The error message originates here [4] and is caused by what to me
>>> appears to be a value read from the NIC [5]. Unfortunately, that
>>> leaves me clueless on how to activate the required "WQE rate mode".
>>> According to the output of ibv_devinfo, my NIC does support packet pacing:
>>>
>>>> # ibv_devinfo -v 81:00.0
>>>> ...
>>>> 	packet_pacing_caps:
>>>> 		qp_rate_limit_min:	1kbps
>>>> 		qp_rate_limit_max:	100000000kbps
>>>> 		supported_qp:
>>>> 					SUPPORT_RAW_PACKET
>>> I'd be grateful for any information on how to get packet pacing up and
>>> running. Am I just missing another required option (which is not given
>>> in the docs) or does my NIC lack packet pacing support?
>>>
>>> Thank you very much in advance.
>>>
>>> Best regards,
>>> Carsten
>>>
>>> [1]
>>>
>> https://doc.dpdk.org/api/rte__ethdev_8h.html#a990d8351447a710628cbb24
>> a
>>> 28d3252d [2] https://patches.dpdk.org/patch/73742/
>>> [3] https://doc.dpdk.org/guides/nics/mlx5.html#run-time-configuration
>>> [4]
>>> http://code.dpdk.org/dpdk/v20.11/source/drivers/net/mlx5/linux/mlx5_os
>>> .c#L1278
>>> [5]
>>>
>> http://code.dpdk.org/dpdk/v20.11/source/drivers/common/mlx5/mlx5_devx
>> _
>>> cmds.c#L748
>>>
>>>
>>
>>
>>

  reply	other threads:[~2021-01-30 10:54 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-29 16:30 Carsten Andrich
2021-01-29 16:50 ` Thomas Monjalon
2021-01-29 18:04   ` Slava Ovsiienko
2021-01-30 10:54     ` Carsten Andrich [this message]
2021-01-30 13:13       ` Thomas Monjalon

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