linux-kernel - Re: [PATCH] scsi: qedi: select UIO

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Message-ID: <D49BF0E9.3633C%manish.rangankar@cavium.com>
Date:   Wed, 11 Jan 2017 09:00:54 +0000
From:   "Rangankar, Manish" <Manish.Rangankar@...ium.com>
To:     "Martin K. Petersen" <martin.petersen@...cle.com>,
        "Ewan D. Milne" <emilne@...hat.com>
CC:     Arnd Bergmann <arnd@...db.de>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        Dept-Eng QLogic Storage Upstream 
        <QLogic-Storage-Upstream@...ium.com>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        "Javali, Nilesh" <Nilesh.Javali@...ium.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] scsi: qedi: select UIO


On 11/01/17 9:40 AM, "Martin K. Petersen" <martin.petersen@...cle.com>
wrote:

>>>>>> "Ewan" == Ewan D Milne <emilne@...hat.com> writes:
>
>Ewan> Randy posted a similar patch back in December but I don't think
>Ewan> there was ever a reply to Christoph's question about why qedi
>Ewan> depends on uio.
>
>I did queue up Randy's patch to shut up the build warnings. But we're
>still looking for a long term fix or an explanation as to why UIO is
>needed in the first place.

Similar to bnx2i driver, qedi driver also has a dependency over iscsiuio
to provide ARP and DHCP functionality for iscsi offload, and the
communication to the
driver is done via uio interface.

https://github.com/open-iscsi/open-iscsi/blob/master/iscsiuio/README


Thanks,
Manish