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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: 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>
This commit is contained in:
Yi Zou 2011-06-20 16:59:05 -07:00 committed by James Bottomley
parent 480584818a
commit 33dc362b7f
2 changed files with 11 additions and 2 deletions
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5
drivers/target/tcm_fc/tfc_cmd.c
View File

@ -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;
}
}

8
include/scsi/libfc.h
View File

@ -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
*