[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>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index 8edcfddc0baf..eca4d611dd49 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -2114,6 +2114,7 @@ iscsi_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
 static struct iscsi_cls_session *
 iscsi_tcp_session_create(struct iscsi_transport *iscsit,
                          struct scsi_transport_template *scsit,
+                         uint16_t cmds_max, uint16_t qdepth,
                          uint32_t initial_cmdsn, uint32_t *hostno)
 {
         struct iscsi_cls_session *cls_session;
@@ -2121,7 +2122,7 @@ iscsi_tcp_session_create(struct iscsi_transport *iscsit,
         uint32_t hn;
         int cmd_i;
 
-        cls_session = iscsi_session_setup(iscsit, scsit,
+        cls_session = iscsi_session_setup(iscsit, scsit, cmds_max, qdepth,
                                          sizeof(struct iscsi_tcp_cmd_task),
                                          sizeof(struct iscsi_tcp_mgmt_task),
                                          initial_cmdsn, &hn);
@@ -2164,7 +2165,7 @@ static struct scsi_host_template iscsi_sht = {
         .name                   = "iSCSI Initiator over TCP/IP",
         .queuecommand           = iscsi_queuecommand,
         .change_queue_depth     = iscsi_change_queue_depth,
-        .can_queue              = ISCSI_XMIT_CMDS_MAX - 1,
+        .can_queue              = ISCSI_DEF_XMIT_CMDS_MAX - 1,
         .sg_tablesize           = ISCSI_SG_TABLESIZE,
         .max_sectors            = 0xFFFF,
         .cmd_per_lun            = ISCSI_DEF_CMD_PER_LUN,