[SCSI] libfc, tcm_fc: add ddp_targ() to libfc function template to supprot FCoE DDP in target mode

The fcoe driver can implement ddp_targ() similarly to ddp_setup() when fcoe
stack works with existing target frame, e.g., tcm, where the ddp_targ() would
eventually point to the underlying hardware driver's implementation of
ndo_fcoe_ddp_targ() through net_device_ops. This new API sets up DDP context
for target appropriately by setting required bits for DDP context.

Signed-off-by: Yi Zou <yi.zou@intel.com>
Signed-off-by: Kiran Patil <kiran.patil@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/include/scsi/libfc.h b/include/scsi/libfc.h
index a3cbda4ddb5c..7d96829b0c00 100644
--- a/include/scsi/libfc.h
+++ b/include/scsi/libfc.h
@@ -511,6 +511,14 @@ struct libfc_function_template {
          */
         int (*ddp_done)(struct fc_lport *, u16);
         /*
+         * Sets up the DDP context for a given exchange id on the given
+         * scatterlist if LLD supports DDP for FCoE target.
+         *
+         * STATUS: OPTIONAL
+         */
+        int (*ddp_target)(struct fc_lport *, u16, struct scatterlist *,
+                          unsigned int);
+        /*
          * Allow LLD to fill its own Link Error Status Block
          *
          * STATUS: OPTIONAL