netdev - RE: mlx5 sub function issue

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Date:   Thu, 11 Mar 2021 06:13:04 +0000
From:   Parav Pandit <parav@...dia.com>
To:     ze wang <wangze712@...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: Wednesday, March 10, 2021 2:59 PM
> 
> Hi Parav,
>       Thanks for your help. I did enabled VFs, and after turning off SR-IOV, it
> works.
Happy to hear that.

> Now the each PF can create 255 SFs, which is probably enough for us.
> Is it convenient
> to reveal how many SFs can be created at most?
> 
Yes, it is. We will be doing this, mostly as devlink resource as discussed last time with Jacob, David, Samudrala in past.
It is in my todo list already. Until its available, please use the existing tooling.

> Ze Wang
> 
> Parav Pandit <parav@...dia.com> 于2021年3月9日周二 下午8:36写道：
> >
> > 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?