netdev - RE: mlx5 sub function issue

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Date:   Tue, 9 Mar 2021 12:36:19 +0000
From:   Parav Pandit <parav@...dia.com>
To:     ze wang <wangze712@...il.com>, David Ahern <dsahern@...il.com>
CC:     Saeed Mahameed <saeedm@...dia.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: mlx5 sub function issue

Hi Ze Wang,

> From: ze wang <wangze712@...il.com>
> Sent: Tuesday, March 9, 2021 8:34 AM
> 
> Hi David,
>       I can see that the variable settings are in effect：
> # mlxconfig -d b3:00.0 s PF_BAR2_ENABLE=0 PER_PF_NUM_SF=1
> PF_SF_BAR_SIZE=8 # mlxconfig -d b3:00.0 s PER_PF_NUM_SF=1
> PF_TOTAL_SF=192 PF_SF_BAR_SIZE=8 # mlxconfig -d b3:00.1 s
> PER_PF_NUM_SF=1 PF_TOTAL_SF=192 PF_SF_BAR_SIZE=8
> 
> after cold reboot:
> # mlxconfig -d b3:00.0 q|grep BAR
> PF_BAR2_ENABLE                           False(0)
> # mlxconfig -d b3:00.0 q|grep SF
> Description:    ConnectX-6 Dx EN adapter card; 25GbE; Dual-port SFP28;
> PCIe 4.0 x8; Crypto and Secure Boot
>          PER_PF_NUM_SF                   True(1)
>          PF_TOTAL_SF                         192
>          PF_SF_BAR_SIZE                   8
> # mlxconfig -d b3:00.1 q|grep SF
> Description:    ConnectX-6 Dx EN adapter card; 25GbE; Dual-port SFP28;
> PCIe 4.0 x8; Crypto and Secure Boot
>          PER_PF_NUM_SF                  True(1)
>          PF_TOTAL_SF                        192
>          PF_SF_BAR_SIZE                  8
> 
> I tried to create as many SF as possible, then I found each PF can create up to
> 132 SFs. I want to confirm the maximum number of SFs that
> CX6 can create. If the mft version is correct, can I think that CX6 can create up
> to 132 SFs per PF?
Do  you have VFs enabled on the system? mlxconfig -d b3:00.0 q | grep VF
If so, please disable SRIOV.

> 
> David Ahern <dsahern@...il.com> 于2021年3月8日周一 下午11:48写道
> ：
> >
> > On 3/8/21 12:21 AM, ze wang wrote:
> > > mlxconfig tool from mft tools version 4.16.52 or higher to set number of
> SF.
> > >
> > > mlxconfig -d b3:00.0  PF_BAR2_ENABLE=0 PER_PF_NUM_SF=1
> > > PF_SF_BAR_SIZE=8 mlxconfig -d b3:00.0  PER_PF_NUM_SF=1
> > > PF_TOTAL_SF=192 PF_SF_BAR_SIZE=8 mlxconfig -d b3:00.1
> > > PER_PF_NUM_SF=1 PF_TOTAL_SF=192 PF_SF_BAR_SIZE=8
> > >
> > > Cold reboot power cycle of the system as this changes the BAR size
> > > in device
> > >
> >
> > Is that capability going to be added to devlink?