[SCSI] libfc, tcm_fc: add ddp_targ() to libfc function template to supprot FCoE DDP in target mode (33dc362b) · Commits · 戴 / test

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>

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
		*

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