netdev - Re: [PATCH rdma-next v2 0/7] Add Enhanced Connection Established (ECE)

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Date:   Mon, 20 Apr 2020 16:36:07 +0300
From:   Leon Romanovsky <leonro@...lanox.com>
To:     Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...lanox.com>
Cc:     Bart Van Assche <bvanassche@....org>,
        Chaitanya Kulkarni <chaitanya.kulkarni@....com>,
        Christoph Hellwig <hch@....de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        linux-nvme@...ts.infradead.org, linux-rdma@...r.kernel.org,
        netdev@...r.kernel.org, rds-devel@....oracle.com,
        Sagi Grimberg <sagi@...mberg.me>,
        Santosh Shilimkar <santosh.shilimkar@...cle.com>,
        target-devel@...r.kernel.org
Subject: Re: [PATCH rdma-next v2 0/7] Add Enhanced Connection Established
 (ECE)

On Mon, Apr 13, 2020 at 05:15:31PM +0300, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@...lanox.com>
>
> Changelog:
>  v2:
>  * Rebased on latest rdma-next and removed already accepted patches.
>  * Updated all rdma_reject in-kernel users to provide reject reason.
>  v1: Dropped field_avail patch in favor of mass conversion to use function
>      which already exists in the kernel code.
>  https://lore.kernel.org/lkml/20200310091438.248429-1-leon@kernel.org
>  v0: https://lore.kernel.org/lkml/20200305150105.207959-1-leon@kernel.org
>
> Enhanced Connection Established or ECE is new negotiation scheme
> introduced in IBTA v1.4 to exchange extra information about nodes
> capabilities and later negotiate them at the connection establishment
> phase.
>
> The RDMA-CM messages (REQ, REP, SIDR_REQ and SIDR_REP) were extended
> to carry two fields, one new and another gained new functionality:
>  * VendorID is a new field that indicates that common subset of vendor
>    option bits are supported as indicated by that VendorID.
>  * AttributeModifier already exists, but overloaded to indicate which
>    vendor options are supported by this VendorID.
>
> This is kernel part of such functionality which is responsible to get data
> from librdmacm and properly create and handle RDMA-CM messages.
>
> Thanks
>
> Leon Romanovsky (7):
>   RDMA/cm: Add Enhanced Connection Establishment (ECE) bits
>   RDMA/uapi: Add ECE definitions to UCMA
>   RDMA/ucma: Extend ucma_connect to receive ECE parameters
>   RDMA/ucma: Deliver ECE parameters through UCMA events
>   RDMA/cm: Send and receive ECE parameter over the wire
>   RDMA/cma: Connect ECE to rdma_accept
>   RDMA/cma: Provide ECE reject reason

PR: https://github.com/linux-rdma/rdma-core/pull/745

Thanks