[SCSI] iscsi class: add iscsi host set param event

The iscsi class uses the set_param event to set session
and connection params. This patch adds a set_host_param
so we can set host level values.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

3 files changed, 37 insertions, 1 deletions

diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index 59287601bd41..3fd2da451fe1 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -968,6 +968,30 @@ iscsi_tgt_dscvr(struct iscsi_transport *transport,
 }
 
 static int
+iscsi_set_host_param(struct iscsi_transport *transport,
+                     struct iscsi_uevent *ev)
+{
+        char *data = (char*)ev + sizeof(*ev);
+        struct Scsi_Host *shost;
+        int err;
+
+        if (!transport->set_host_param)
+                return -ENOSYS;
+
+        shost = scsi_host_lookup(ev->u.set_host_param.host_no);
+        if (IS_ERR(shost)) {
+                printk(KERN_ERR "set_host_param could not find host no %u\n",
+                       ev->u.set_host_param.host_no);
+                return -ENODEV;
+        }
+
+        err = transport->set_host_param(shost, ev->u.set_host_param.param,
+                                        data, ev->u.set_host_param.len);
+        scsi_host_put(shost);
+        return err;
+}
+
+static int
 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 {
         int err = 0;
@@ -1058,8 +1082,11 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
         case ISCSI_UEVENT_TGT_DSCVR:
                 err = iscsi_tgt_dscvr(transport, ev);
                 break;
+        case ISCSI_UEVENT_SET_HOST_PARAM:
+                err = iscsi_set_host_param(transport, ev);
+                break;
         default:
-                err = -EINVAL;
+                err = -ENOSYS;
                 break;
         }
 
diff --git a/include/scsi/iscsi_if.h b/include/scsi/iscsi_if.h
index fba211743729..3d0372e30ca1 100644
--- a/include/scsi/iscsi_if.h
+++ b/include/scsi/iscsi_if.h
@@ -48,6 +48,7 @@ enum iscsi_uevent_e {
         ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT    = UEVENT_BASE + 14,
 
         ISCSI_UEVENT_TGT_DSCVR          = UEVENT_BASE + 15,
+        ISCSI_UEVENT_SET_HOST_PARAM     = UEVENT_BASE + 16,
 
         /* up events */
         ISCSI_KEVENT_RECV_PDU           = KEVENT_BASE + 1,
@@ -136,6 +137,11 @@ struct iscsi_uevent {
                          */
                         uint32_t        enable;
                 } tgt_dscvr;
+                struct msg_set_host_param {
+                        uint32_t        host_no;
+                        uint32_t        param; /* enum iscsi_host_param */
+                        uint32_t        len;
+                } set_host_param;
         } u;
         union {
                 /* messages k -> u */
diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h
index 902e69f0272c..1ac450b06909 100644
--- a/include/scsi/scsi_transport_iscsi.h
+++ b/include/scsi/scsi_transport_iscsi.h
@@ -108,6 +108,9 @@ struct iscsi_transport {
                                   enum iscsi_param param, char *buf);
         int (*get_host_param) (struct Scsi_Host *shost,
                                 enum iscsi_host_param param, char *buf);
+        int (*set_host_param) (struct Scsi_Host *shost,
+                               enum iscsi_host_param param, char *buf,
+                               int buflen);
         int (*send_pdu) (struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
                          char *data, uint32_t data_size);
         void (*get_stats) (struct iscsi_cls_conn *conn,