[SCSI] libfc: don't require a local exchange for incoming requests

Incoming requests shouldn't require a local exchange if we're
just going to reply with one or two frames and don't expect
anything further.  Don't allocate exchanges for such requests
until requested by the upper-layer protocol.

The sequence is always NULL for new requests, so remove
that as an argument to request handlers.

Also change the first argument to lport->tt.seq_els_rsp_send
from the sequence pointer to the received frame pointer, to
supply the exchange IDs and destination ID info.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 5 insertions, 11 deletions

diff --git a/include/scsi/libfc.h b/include/scsi/libfc.h
index 605f1d7861a7..14be49b44e84 100644
--- a/include/scsi/libfc.h
+++ b/include/scsi/libfc.h
@@ -249,14 +249,12 @@ struct fcoe_dev_stats {
 
 /**
  * struct fc_seq_els_data - ELS data used for passing ELS specific responses
- * @fp:     The ELS frame
  * @reason: The reason for rejection
  * @explan: The explaination of the rejection
  *
  * Mainly used by the exchange manager layer.
  */
 struct fc_seq_els_data {
-        struct fc_frame *fp;
         enum fc_els_rjt_reason reason;
         enum fc_els_rjt_explan explan;
 };
@@ -519,12 +517,11 @@ struct libfc_function_template {
                         struct fc_frame *);
 
         /*
-         * Send an ELS response using infomation from a previous
-         * exchange and sequence.
+         * Send an ELS response using infomation from the received frame.
          *
          * STATUS: OPTIONAL
          */
-        void (*seq_els_rsp_send)(struct fc_seq *, enum fc_els_cmd,
+        void (*seq_els_rsp_send)(struct fc_frame *, enum fc_els_cmd,
                                  struct fc_seq_els_data *);
 
         /*
@@ -583,8 +580,7 @@ struct libfc_function_template {
          *
          * STATUS: OPTIONAL
          */
-        void (*lport_recv)(struct fc_lport *, struct fc_seq *,
-                           struct fc_frame *);
+        void (*lport_recv)(struct fc_lport *, struct fc_frame *);
 
         /*
          * Reset the local port.
@@ -646,8 +642,7 @@ struct libfc_function_template {
          *
          * STATUS: OPTIONAL
          */
-        void (*rport_recv_req)(struct fc_seq *, struct fc_frame *,
-                               struct fc_lport *);
+        void (*rport_recv_req)(struct fc_lport *, struct fc_frame *);
 
         /*
          * lookup an rport by it's port ID.
@@ -693,8 +688,7 @@ struct libfc_function_template {
          *
          * STATUS: OPTIONAL
          */
-        void (*disc_recv_req)(struct fc_seq *, struct fc_frame *,
-                              struct fc_lport *);
+        void (*disc_recv_req)(struct fc_lport *, struct fc_frame *);
 
         /*
          * Start discovery for a local port.