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tcm_fc: Remove use of transport_do_task_sg_chain() 

With the modern target core, se_cmd->t_data_sg already points to a
sglist that covers the whole command.  So task_sg chaining is needless
overhead and obfuscation -- instead of splicing the split up task
sglists back into one list, we can just use the original list directly.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Kiran Patil <Kiran.patil@intel.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Roland Dreier 2012-03-30 11:29:11 -07:00 committed by Nicholas Bellinger
parent bebe2fdc17
commit e182d6828d
3 changed files with 5 additions and 18 deletions
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18
drivers/target/tcm_fc/tfc_cmd.c
View File

@ -215,20 +215,10 @@ int ft_write_pending(struct se_cmd *se_cmd)
*/
if ((ep->xid <= lport->lro_xid) &&
(fh->fh_r_ctl == FC_RCTL_DD_DATA_DESC)) {
if (se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
/*
* cmd may have been broken up into multiple
* tasks. Link their sgs together so we can
* operate on them all at once.
*/
transport_do_task_sg_chain(se_cmd);
cmd->sg = se_cmd->t_tasks_sg_chained;
cmd->sg_cnt =
se_cmd->t_tasks_sg_chained_no;
}
if (cmd->sg && lport->tt.ddp_target(lport, ep->xid,
cmd->sg,
cmd->sg_cnt))
if ((se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) &&
lport->tt.ddp_target(lport, ep->xid,
se_cmd->t_data_sg,
se_cmd->t_data_nents))
cmd->was_ddp_setup = 1;
}
}

3
drivers/target/tcm_fc/tfc_conf.c
View File

@ -576,9 +576,6 @@ int ft_register_configfs(void)
}
fabric->tf_ops = ft_fabric_ops;
/* Allowing support for task_sg_chaining */
fabric->tf_ops.task_sg_chaining = 1;
/*
* Setup default attribute lists for various fabric->tf_cit_tmpl
*/

2
drivers/target/tcm_fc/tfc_io.c
View File

@ -228,7 +228,7 @@ void ft_recv_write_data(struct ft_cmd *cmd, struct fc_frame *fp)
"payload, Frame will be dropped if"
"'Sequence Initiative' bit in f_ctl is"
"not set\n", __func__, ep->xid, f_ctl,
cmd->sg, cmd->sg_cnt);
se_cmd->t_data_sg, se_cmd->t_data_nents);
/*
* Invalidate HW DDP context if it was setup for respective
* command. Invalidation of HW DDP context is requited in both