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From:   Suganath Prabu Subramani <suganath-prabu.subramani@broadcom.com>
Date:   Thu, 20 Jun 2019 12:34:05 +0530
Message-ID: <CA+RiK64sFfY79i7q2YbN5HcZ4wzVOcLWgDJnPbf6=ycdcmC-Mg@mail.gmail.com>
Subject: Re: [PATCH 7/8] mpt3sas: set an unlimited max_segment_size for SAS
 3.0 HBAs
To:     Ming Lei <tom.leiming@gmail.com>
Cc:     Christoph Hellwig <hch@lst.de>,
        "Martin K . Petersen" <martin.petersen@oracle.com>,
        Sagi Grimberg <sagi@grimberg.me>,
        Max Gurtovoy <maxg@mellanox.com>,
        Bart Van Assche <bvanassche@acm.org>,
        linux-rdma <linux-rdma@vger.kernel.org>,
        Linux SCSI List <linux-scsi@vger.kernel.org>,
        megaraidlinux.pdl@broadcom.com,
        PDL-MPT-FUSIONLINUX <MPT-FusionLinux.pdl@broadcom.com>,
        linux-hyperv@vger.kernel.org,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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Please consider this as Acked-by: Suganath Prabu
<suganath-prabu.subramani@broadcom.com>


On Tue, Jun 18, 2019 at 6:16 AM Ming Lei <tom.leiming@gmail.com> wrote:
>
> On Mon, Jun 17, 2019 at 8:21 PM Christoph Hellwig <hch@lst.de> wrote:
> >
> > When using a virt_boundary_mask, as done for NVMe devices attached to
> > mpt3sas controllers we require an unlimited max_segment_size, as the
> > virt boundary merging code assumes that.  But we also need to propagate
> > that to the DMA mapping layer to make dma-debug happy.  The SCSI layer
> > takes care of that when using the per-host virt_boundary setting, but
> > given that mpt3sas only wants to set the virt_boundary for actual
> > NVMe devices we can't rely on that.  The DMA layer maximum segment
> > is global to the HBA however, so we have to set it explicitly.  This
> > patch assumes that mpt3sas does not have a segment size limitation,
> > which seems true based on the SGL format, but will need to be verified.
> >
> > Signed-off-by: Christoph Hellwig <hch@lst.de>
> > ---
> >  drivers/scsi/mpt3sas/mpt3sas_scsih.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
> > index 1ccfbc7eebe0..c719b807f6d8 100644
> > --- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
> > +++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
> > @@ -10222,6 +10222,7 @@ static struct scsi_host_template mpt3sas_driver_template = {
> >         .this_id                        = -1,
> >         .sg_tablesize                   = MPT3SAS_SG_DEPTH,
> >         .max_sectors                    = 32767,
> > +       .max_segment_size               = 0xffffffff,
>
> .max_segment_size should be aligned, either setting it here correctly or
> forcing to make it aligned in scsi-core.
>
> Thanks,
> Ming Lei