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Commit 33dc362b authored by Yi Zou's avatar Yi Zou Committed by James Bottomley
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[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: default avatarYi Zou <yi.zou@intel.com>
Signed-off-by: default avatarKiran Patil <kiran.patil@intel.com>
Signed-off-by: default avatarRobert Love <robert.w.love@intel.com>
Signed-off-by: default avatarJames Bottomley <JBottomley@Parallels.com>
parent 48058481

drivers/target/tcm_fc/tfc_cmd.c

+3 −2
Original line number Diff line number Diff line
@@ -266,8 +266,9 @@ int ft_write_pending(struct se_cmd *se_cmd) 
				cmd->sg_cnt =

					T_TASK(se_cmd)->t_tasks_sg_chained_no;

			}

			if (cmd->sg && lport->tt.ddp_setup(lport, ep->xid,

						    cmd->sg, cmd->sg_cnt))

			if (cmd->sg && lport->tt.ddp_target(lport, ep->xid,

							    cmd->sg,

							    cmd->sg_cnt))

				cmd->was_ddp_setup = 1;

		}

	}

include/scsi/libfc.h

+8 −0
Original line number Diff line number Diff line
@@ -510,6 +510,14 @@ struct libfc_function_template { 
	 * STATUS: OPTIONAL

	 */

	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

	 *