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Date:   Sat, 8 Jun 2019 10:14:00 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Kashyap Desai <kashyap.desai@broadcom.com>
Cc:     Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
        Sebastian Ott <sebott@linux.ibm.com>,
        Sagi Grimberg <sagi@grimberg.me>,
        Max Gurtovoy <maxg@mellanox.com>,
        Bart Van Assche <bvanassche@acm.org>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        Alan Stern <stern@rowland.harvard.edu>,
        Oliver Neukum <oneukum@suse.com>, linux-block@vger.kernel.org,
        linux-rdma@vger.kernel.org, linux-mmc@vger.kernel.org,
        linux-nvme@lists.infradead.org, linux-scsi@vger.kernel.org,
        "PDL,MEGARAIDLINUX" <megaraidlinux.pdl@broadcom.com>,
        PDL-MPT-FUSIONLINUX <mpt-fusionlinux.pdl@broadcom.com>,
        linux-hyperv@vger.kernel.org, linux-usb@vger.kernel.org,
        usb-storage@lists.one-eyed-alien.net, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 10/13] megaraid_sas: set virt_boundary_mask in the scsi
 host
Message-ID: <20190608081400.GA19573@lst.de>
References: <20190605190836.32354-1-hch@lst.de> <20190605190836.32354-11-hch@lst.de> <cd713506efb9579d1f69a719d831c28d@mail.gmail.com>
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On Thu, Jun 06, 2019 at 09:07:27PM +0530, Kashyap Desai wrote:
> Hi Christoph, Changes for <megaraid_sas> and <mpt3sas> looks good. We want
> to confirm few sanity before ACK. BTW, what benefit we will see moving
> virt_boundry setting to SCSI mid layer ? Is it just modular approach OR any
> functional fix ?

The big difference is that virt_boundary now also changes the
max_segment_size, and this ensures that this limit is also communicated
to the DMA mapping layer.