Pete Wyckoff wrote:
> Add a slave_configure function to iSCSI TCP to remove any DMA
> alignment restriction. This permits the use of direct IO from
> arbitrary addresses.
>
> Signed-off-by: Pete Wyckoff <pw@xxxxxxx>
> ---
> drivers/scsi/iscsi_tcp.c | 11 +++++++++++
> 1 files changed, 11 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
> index 4376840..f48eedd 100644
> --- a/drivers/scsi/iscsi_tcp.c
> +++ b/drivers/scsi/iscsi_tcp.c
> @@ -2132,6 +2132,16 @@ static void iscsi_tcp_session_destroy(struct iscsi_cls_session *cls_session)
> iscsi_session_teardown(cls_session);
> }
>
> +/*
> + * New device attached. Turn off the DMA alignment restriction on
> + * the request queue.
> + */
> +static int iscsi_tcp_slave_configure(struct scsi_device *sdev)
> +{
> + blk_queue_dma_alignment(sdev->request_queue, 0);
> + return 0;
> +}
> +
I think the comments are not needed, but that is not a big deal. I will
put this in my tree and send it to James if he does not pick it up from
linux-scsi.
Thanks for the patch.
Erez, I do not think ib_iser should have any limit either (I only looked
at the code for a little bit though). You may want to do the the same
for iser.
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