netdev - Re: [PATCH] RDMA: Split kernel-only global device caps from uvers device caps

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Date:   Tue, 5 Apr 2022 06:43:31 +0200
From:   Christoph Hellwig <hch@....de>
To:     Jason Gunthorpe <jgg@...dia.com>
Cc:     Ariel Elior <aelior@...vell.com>, Anna Schumaker <anna@...nel.org>,
        Jens Axboe <axboe@...com>,
        Christian Benvenuti <benve@...co.com>,
        Potnuri Bharat Teja <bharat@...lsio.com>,
        Bernard Metzler <bmt@...ich.ibm.com>,
        Bart Van Assche <bvanassche@....org>,
        Chuck Lever <chuck.lever@...cle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>,
        Christoph Hellwig <hch@....de>,
        Keith Busch <kbusch@...nel.org>,
        Chaitanya Kulkarni <kch@...dia.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Leon Romanovsky <leon@...nel.org>, linux-cifs@...r.kernel.org,
        linux-nfs@...r.kernel.org, linux-nvme@...ts.infradead.org,
        linux-rdma@...r.kernel.org, Max Gurtovoy <mgurtovoy@...dia.com>,
        Mike Marciniszyn <mike.marciniszyn@...nelisnetworks.com>,
        Michal Kalderon <mkalderon@...vell.com>,
        Mustafa Ismail <mustafa.ismail@...el.com>,
        Nelson Escobar <neescoba@...co.com>, netdev@...r.kernel.org,
        Paolo Abeni <pabeni@...hat.com>, rds-devel@....oracle.com,
        Sagi Grimberg <sagi@...mberg.me>,
        samba-technical@...ts.samba.org,
        Santosh Shilimkar <santosh.shilimkar@...cle.com>,
        Selvin Xavier <selvin.xavier@...adcom.com>,
        Steve French <sfrench@...ba.org>,
        Shiraz Saleem <shiraz.saleem@...el.com>,
        target-devel@...r.kernel.org,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Yishai Hadas <yishaih@...dia.com>,
        Zhu Yanjun <zyjzyj2000@...il.com>,
        Xiao Yang <yangx.jy@...itsu.com>
Subject: Re: [PATCH] RDMA: Split kernel-only global device caps from uvers
 device caps

On Mon, Apr 04, 2022 at 01:18:00PM -0300, Jason Gunthorpe wrote:
> Split ib_device::device_cap_flags into kernel_cap_flags that holds the
> flags only used by the kernel.
> 
> This cleanly splits out the uverbs flags from the kernel flags to avoid
> confusion in the flags bitmap.

> Followup from Xiao Yang's series

Can you point me to this series?

> -	if (!(device->attrs.device_cap_flags & IB_DEVICE_ALLOW_USER_UNREG)) {
> +	if (!(device->attrs.kernel_cap_flags & IB_KDEVICE_ALLOW_USER_UNREG)) {

Maybe shorten the prefix to IBD_ ?

> +enum ib_kernel_cap_flags {
> +	/*
> +	 * This device supports a per-device lkey or stag that can be
> +	 * used without performing a memory registration for the local
> +	 * memory.  Note that ULPs should never check this flag, but
> +	 * instead of use the local_dma_lkey flag in the ib_pd structure,
> +	 * which will always contain a usable lkey.
> +	 */
> +	IB_KDEVICE_LOCAL_DMA_LKEY = 1 << 0,
> +	IB_KDEVICE_UD_TSO = 1 << 1,
> +	IB_KDEVICE_BLOCK_MULTICAST_LOOPBACK = 1 << 2,
> +	IB_KDEVICE_INTEGRITY_HANDOVER = 1 << 3,
> +	IB_KDEVICE_ON_DEMAND_PAGING = 1ULL << 4,
> +	IB_KDEVICE_SG_GAPS_REG = 1ULL << 5,
> +	IB_KDEVICE_VIRTUAL_FUNCTION = 1ULL << 6,
> +	IB_KDEVICE_RDMA_NETDEV_OPA = 1ULL << 7,
> +	IB_KDEVICE_ALLOW_USER_UNREG = 1ULL << 8,
> +};

And maybe not in this patch, but if you touch this anyway please add
comments to document allthe flags.