| Message ID | 20180725142259.20562-3-gedwards@ddn.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | virtio_scsi pi_bytes{out,in} miscalculated on 4 KiB devices | expand |
Greg, > The current calculation for pi_bytes{out,in} assumes a 512 byte logical > block size and a protection interval exponent of 0, i.e. 512 bytes data > + 8 bytes PI. The block layer always deals with units of 512 bytes. Regardless of the underlying logical block size. > When run on a 4 KiB logical block size device with a protection > interval exponent of 0, i.e. 4096 bytes data + 8 bytes PI, the driver > miscalculates the pi_bytes{out,in} by a factor of 8x (64 bytes). > @@ -513,12 +513,12 @@ static void virtio_scsi_init_hdr_pi(struct virtio_device *vdev, > > if (sc->sc_data_direction == DMA_TO_DEVICE) > cmd_pi->pi_bytesout = cpu_to_virtio32(vdev, > - blk_rq_sectors(rq) * > - bi->tuple_size); > + bio_integrity_bytes(bi, > + blk_rq_sectors(rq))); The formatting/alignment could be improved here. Otherwise OK. Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c index 6dc8891ccb74..a1e85ab76f74 100644 --- a/drivers/scsi/virtio_scsi.c +++ b/drivers/scsi/virtio_scsi.c @@ -513,12 +513,12 @@ static void virtio_scsi_init_hdr_pi(struct virtio_device *vdev, if (sc->sc_data_direction == DMA_TO_DEVICE) cmd_pi->pi_bytesout = cpu_to_virtio32(vdev, - blk_rq_sectors(rq) * - bi->tuple_size); + bio_integrity_bytes(bi, + blk_rq_sectors(rq))); else if (sc->sc_data_direction == DMA_FROM_DEVICE) cmd_pi->pi_bytesin = cpu_to_virtio32(vdev, - blk_rq_sectors(rq) * - bi->tuple_size); + bio_integrity_bytes(bi, + blk_rq_sectors(rq))); } #endif
The current calculation for pi_bytes{out,in} assumes a 512 byte logical block size and a protection interval exponent of 0, i.e. 512 bytes data + 8 bytes PI. When run on a 4 KiB logical block size device with a protection interval exponent of 0, i.e. 4096 bytes data + 8 bytes PI, the driver miscalculates the pi_bytes{out,in} by a factor of 8x (64 bytes). This leads to errors on all reads and writes on 4 KiB logical block size devices when CONFIG_BLK_DEV_INTEGRITY is enabled and the VIRTIO_SCSI_F_T10_PI feature bit has been negotiated. Fixes: e6dc783a38ec0 ("virtio-scsi: Enable DIF/DIX modes in SCSI host LLD") Signed-off-by: Greg Edwards <gedwards@ddn.com> --- drivers/scsi/virtio_scsi.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)