iscsi-target: add void (*iscsit_get_r2t_ttt)()

Add void (*iscsit_get_r2t_ttt)() to
struct iscsit_transport, iscsi-target
uses this callback to get
r2t->targ_xfer_tag.

cxgbit.ko needs this callback
for Direct Data Placement of Data Out
pdus, adapter uses ttt in Data Out pdus
for placing data directly in to the host
buffers.

Signed-off-by: Varun Prakash <varun@chelsio.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

2 files changed, 6 insertions, 1 deletions

diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index a827b7afe42c..a28eb87d6efc 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -3039,7 +3039,10 @@ static int iscsit_send_r2t(
         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
                         (struct scsi_lun *)&hdr->lun);
         hdr->itt                = cmd->init_task_tag;
-        r2t->targ_xfer_tag      = session_get_next_ttt(conn->sess);
+        if (conn->conn_transport->iscsit_get_r2t_ttt)
+                conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
+        else
+                r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
         hdr->statsn             = cpu_to_be32(conn->stat_sn);
         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
diff --git a/include/target/iscsi/iscsi_transport.h b/include/target/iscsi/iscsi_transport.h
index 46aa219be1ae..32704b214be5 100644
--- a/include/target/iscsi/iscsi_transport.h
+++ b/include/target/iscsi/iscsi_transport.h
@@ -27,6 +27,8 @@ struct iscsit_transport {
         void (*iscsit_release_cmd)(struct iscsi_conn *, struct iscsi_cmd *);
         void (*iscsit_get_rx_pdu)(struct iscsi_conn *);
         int (*iscsit_validate_params)(struct iscsi_conn *);
+        void (*iscsit_get_r2t_ttt)(struct iscsi_conn *, struct iscsi_cmd *,
+                                   struct iscsi_r2t *);
         enum target_prot_op (*iscsit_get_sup_prot_ops)(struct iscsi_conn *);
 };