zfcp: Report scatter gather limit for DIX protection information

When sending DIX integrity segments with an I/O request, the restriction for the maximum number of segments is still the same for the zfcp hardware. Report the new sg_prot_tablesize for the SCSI host, so that the number of integrity segments plus the number of data segments is not larger than the hardware limit. This results in using half of the hardware segments for integrity data and the other half for regular data. Reviewed-by: Swen Schillig <[email protected]> Signed-off-by: Christof Schmitt <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
oohal · Sep 10, 2010 · 175b79f · 175b79f
1 parent 13f05c8
commit 175b79f
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/drivers/s390/scsi/zfcp_scsi.c b/drivers/s390/scsi/zfcp_scsi.c
@@ -681,6 +681,7 @@ void zfcp_scsi_set_prot(struct zfcp_adapter *adapter)
 	    adapter->adapter_features & FSF_FEATURE_DIX_PROT_TCPIP) {
 		mask |= SHOST_DIX_TYPE1_PROTECTION;
 		scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
+		shost->sg_prot_tablesize = ZFCP_QDIO_MAX_SBALES_PER_REQ / 2;
 		shost->sg_tablesize = ZFCP_QDIO_MAX_SBALES_PER_REQ / 2;
 		shost->max_sectors = ZFCP_QDIO_MAX_SBALES_PER_REQ * 8 / 2;
 	}