[SCSI] libiscsi: make can_queue configurable

This patch allows us to set can_queue and cmds_per_lun from userspace
when we create the session/host. From there we can set it on a per
target basis. The patch fully converts iscsi_tcp, but only hooks
up ib_iser for cmd_per_lun since it currently has a lots of preallocations
based on can_queue.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Cc: Roland Dreier <rdreier@cisco.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

3 files changed, 7 insertions, 5 deletions

diff --git a/include/scsi/iscsi_if.h b/include/scsi/iscsi_if.h
index 1a18196d77f..a046a329189 100644
--- a/include/scsi/iscsi_if.h
+++ b/include/scsi/iscsi_if.h
@@ -72,6 +72,8 @@ struct iscsi_uevent {
                 /* messages u -> k */
                 struct msg_create_session {
                         uint32_t        initial_cmdsn;
+                        uint16_t        cmds_max;
+                        uint16_t        queue_depth;
                 } c_session;
                 struct msg_destroy_session {
                         uint32_t        sid;
diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h
index 8d48cf8f2e3..2f303a3b270 100644
--- a/include/scsi/libiscsi.h
+++ b/include/scsi/libiscsi.h
@@ -48,9 +48,8 @@ struct iscsi_nopin;
 #define debug_scsi(fmt...)
 #endif
 
-#define ISCSI_XMIT_CMDS_MAX     128     /* must be power of 2 */
-#define ISCSI_MGMT_CMDS_MAX     32      /* must be power of 2 */
-#define ISCSI_CONN_MAX                  1
+#define ISCSI_DEF_XMIT_CMDS_MAX 128     /* must be power of 2 */
+#define ISCSI_MGMT_CMDS_MAX     16      /* must be power of 2 */
 
 #define ISCSI_MGMT_ITT_OFFSET   0xa00
 
@@ -268,7 +267,7 @@ extern int iscsi_host_get_param(struct Scsi_Host *shost,
  */
 extern struct iscsi_cls_session *
 iscsi_session_setup(struct iscsi_transport *, struct scsi_transport_template *,
-                    int, int, uint32_t, uint32_t *);
+                    uint16_t, uint16_t, int, int, uint32_t, uint32_t *);
 extern void iscsi_session_teardown(struct iscsi_cls_session *);
 extern struct iscsi_session *class_to_transport_session(struct iscsi_cls_session *);
 extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *);
diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h
index abc4068621d..706c0cd36c1 100644
--- a/include/scsi/scsi_transport_iscsi.h
+++ b/include/scsi/scsi_transport_iscsi.h
@@ -90,7 +90,8 @@ struct iscsi_transport {
         unsigned int max_conn;
         unsigned int max_cmd_len;
         struct iscsi_cls_session *(*create_session) (struct iscsi_transport *it,
-                struct scsi_transport_template *t, uint32_t sn, uint32_t *hn);
+                struct scsi_transport_template *t, uint16_t, uint16_t,
+                uint32_t sn, uint32_t *hn);
         void (*destroy_session) (struct iscsi_cls_session *session);
         struct iscsi_cls_conn *(*create_conn) (struct iscsi_cls_session *sess,
                                 uint32_t cid);