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Re: [Qemu-devel] [PATCH] scsi: support NDOB (no data-out buffer) for WRI
From: |
Fam Zheng |
Subject: |
Re: [Qemu-devel] [PATCH] scsi: support NDOB (no data-out buffer) for WRITE SAME commands |
Date: |
Fri, 9 Mar 2018 17:24:54 +0800 |
User-agent: |
Mutt/1.9.2 (2017-12-15) |
On Thu, 03/08 16:51, Paolo Bonzini wrote:
> A NDOB bit set to one specifies that the disk shall not transfer data
> from the data-out buffer and shall process the command as if the data-out
> buffer contained user data set to all zeroes.
>
> Signed-off-by: Paolo Bonzini <address@hidden>
> ---
> hw/scsi/scsi-bus.c | 2 +-
> hw/scsi/scsi-disk.c | 2 +-
> tests/virtio-scsi-test.c | 6 ++++++
> 3 files changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/hw/scsi/scsi-bus.c b/hw/scsi/scsi-bus.c
> index 1eaeffc830..9646743a7d 100644
> --- a/hw/scsi/scsi-bus.c
> +++ b/hw/scsi/scsi-bus.c
> @@ -944,7 +944,7 @@ static int scsi_req_xfer(SCSICommand *cmd, SCSIDevice
> *dev, uint8_t *buf)
> break;
> case WRITE_SAME_10:
> case WRITE_SAME_16:
> - cmd->xfer = dev->blocksize;
> + cmd->xfer = buf[1] & 1 ? 0 : dev->blocksize;
> break;
> case READ_CAPACITY_10:
> cmd->xfer = 8;
> diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
> index c65c1ce56d..5b7a48f5a5 100644
> --- a/hw/scsi/scsi-disk.c
> +++ b/hw/scsi/scsi-disk.c
> @@ -1807,7 +1807,7 @@ static void scsi_disk_emulate_write_same(SCSIDiskReq
> *r, uint8_t *inbuf)
> return;
> }
>
> - if (buffer_is_zero(inbuf, s->qdev.blocksize)) {
> + if ((req->cmd.buf[1] & 0x1) || buffer_is_zero(inbuf, s->qdev.blocksize))
> {
> int flags = (req->cmd.buf[1] & 0x8) ? BDRV_REQ_MAY_UNMAP : 0;
The standard says this bit is only allowed when UNMAP is set. Do we want to
check it here? I.e.
if (!flags && (req->cmd.buf[1] & 0x1)) {
scsi_check_condition(r, SENSE_CODE(INVALID_FIELD));
return;
}
>
> /* The request is used as the AIO opaque value, so add a ref. */
> diff --git a/tests/virtio-scsi-test.c b/tests/virtio-scsi-test.c
> index 7393d69bb2..037872bb98 100644
> --- a/tests/virtio-scsi-test.c
> +++ b/tests/virtio-scsi-test.c
> @@ -216,6 +216,9 @@ static void test_unaligned_write_same(void)
> const uint8_t write_same_cdb_2[VIRTIO_SCSI_CDB_SIZE] = {
> 0x41, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x33, 0x00, 0x00
> };
> + const uint8_t write_same_cdb_ndob[VIRTIO_SCSI_CDB_SIZE] = {
> + 0x41, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x33, 0x00, 0x00
> + };
If we add a check, maybe a test can be added to.
Fam
>
> vs = qvirtio_scsi_pci_init(PCI_SLOT);
>
> @@ -225,6 +228,9 @@ static void test_unaligned_write_same(void)
> g_assert_cmphex(0, ==,
> virtio_scsi_do_command(vs, write_same_cdb_2, NULL, 0, buf2, 512,
> NULL));
>
> + g_assert_cmphex(0, ==,
> + virtio_scsi_do_command(vs, write_same_cdb_ndob, NULL, 0, NULL, 0,
> NULL));
> +
> qvirtio_scsi_pci_free(vs);
> }
>
> --
> 2.14.3
>