netdev - Re: [PATCH rdma-next] RDMA: Support more than 255 rdma ports

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Message-ID: <YFxAbeGKAuFJYrll@unreal>
Date:   Thu, 25 Mar 2021 09:49:01 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>
Cc:     Mark Bloch <mbloch@...dia.com>, Adit Ranadive <aditr@...are.com>,
        Ariel Elior <aelior@...vell.com>,
        Bart Van Assche <bvanassche@....org>,
        Bernard Metzler <bmt@...ich.ibm.com>,
        Christian Benvenuti <benve@...co.com>,
        Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>,
        Devesh Sharma <devesh.sharma@...adcom.com>,
        Faisal Latif <faisal.latif@...el.com>,
        Gal Pressman <galpress@...zon.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Lijun Ou <oulijun@...wei.com>, linux-rdma@...r.kernel.org,
        Michal Kalderon <mkalderon@...vell.com>,
        Mike Marciniszyn <mike.marciniszyn@...nelisnetworks.com>,
        Naresh Kumar PBS <nareshkumar.pbs@...adcom.com>,
        Nelson Escobar <neescoba@...co.com>, netdev@...r.kernel.org,
        Potnuri Bharat Teja <bharat@...lsio.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Selvin Xavier <selvin.xavier@...adcom.com>,
        Shiraz Saleem <shiraz.saleem@...el.com>,
        Somnath Kotur <somnath.kotur@...adcom.com>,
        Sriharsha Basavapatna <sriharsha.basavapatna@...adcom.com>,
        target-devel@...r.kernel.org,
        VMware PV-Drivers <pv-drivers@...are.com>,
        Weihang Li <liweihang@...wei.com>,
        "Wei Hu(Xavier)" <huwei87@...ilicon.com>,
        Yishai Hadas <yishaih@...dia.com>,
        Zhu Yanjun <zyjzyj2000@...il.com>
Subject: Re: [PATCH rdma-next] RDMA: Support more than 255 rdma ports

On Mon, Mar 01, 2021 at 09:04:20AM +0200, Leon Romanovsky wrote:
> From: Mark Bloch <mbloch@...dia.com>
> 
> Current code uses many different types when dealing with a port of a
> RDMA device: u8, unsigned int and u32. Switch to u32 to clean up the
> logic.
> 
> This allows us to make (at least) the core view consistent and use the same
> type. Unfortunately not all places can be converted. Many uverbs functions
> expect port to be u8 so keep those places in order not to break UAPIs.
> HW/Spec defined values must also not be changed.
> 
> With the switch to u32 we now can support devices with more than 255
> ports. U32_MAX is reserved to make control logic a bit easier to deal
> with. As a device with U32_MAX ports probably isn't going to happen any
> time soon this seems like a non issue.
> 
> When a device with more than 255 ports is created uverbs will report
> the RDMA device as having 255 ports as this is the max currently supported.
> 
> The verbs interface is not changed yet because the IBTA spec limits the
> port size in too many places to be u8 and all applications that relies in
> verbs won't be able to cope with this change. At this stage, we are
> extending the interfaces that are using vendor channel solely
> 
> Once the limitation is lifted mlx5 in switchdev mode will be able to have
> thousands of SFs created by the device. As the only instance of an RDMA
> device that reports more than 255 ports will be a representor device
> and it exposes itself as a RAW Ethernet only device CM/MAD/IPoIB and other
> ULPs aren't effected by this change and their sysfs/interfaces that
> are exposes to userspace can remain unchanged.
> 
> While here cleanup some alignment issues and remove unneeded sanity
> checks (mainly in rdmavt),
> 
> Signed-off-by: Mark Bloch <mbloch@...dia.com>
> Signed-off-by: Leon Romanovsky <leonro@...dia.com>
> ---

Jason, ping

Thanks