[SCSI] zfcp: Report scatter-gather limits to SCSI and block layer

Instead of dealing with large segments in the scatter-gather lists in
zfcp_qdio.c, report the limits to the upper layers. With these limits
in place, the code for mapping large data blocks to multiple sbales
can be removed.

Reviewed-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/s390/scsi/zfcp_aux.c b/drivers/s390/scsi/zfcp_aux.c
index 1e6183a86ce5..abf33db647ff 100644
--- a/drivers/s390/scsi/zfcp_aux.c
+++ b/drivers/s390/scsi/zfcp_aux.c
@@ -545,6 +545,10 @@ struct zfcp_adapter *zfcp_adapter_enqueue(struct ccw_device *ccw_device)
                                &zfcp_sysfs_adapter_attrs))
                 goto failed;
 
+        /* report size limit per scatter-gather segment */
+        adapter->dma_parms.max_segment_size = ZFCP_QDIO_SBALE_LEN;
+        adapter->ccw_device->dev.dma_parms = &adapter->dma_parms;
+
         if (!zfcp_adapter_scsi_register(adapter))
                 return adapter;