[SCSI] iscsi_transport: add support for net settings

Allows user space (iscsiadm) to send down network configuration
parameters for LLD to set private network configuration on the iSCSI
adapters.

Based on patch from Lalit Chandivade.

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

drivers/scsi/scsi_transport_iscsi.c

@@ -1557,6 +1557,30 @@ iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
 	return err;
 }
 
+static int
+iscsi_set_iface_params(struct iscsi_transport *transport,
+		       struct iscsi_uevent *ev)
+{
+	char *data = (char *)ev + sizeof(*ev);
+	struct Scsi_Host *shost;
+	int err;
+
+	if (!transport->set_iface_param)
+		return -ENOSYS;
+
+	shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
+	if (!shost) {
+		printk(KERN_ERR "set_iface_params could not find host no %u\n",
+		       ev->u.set_iface_params.host_no);
+		return -ENODEV;
+	}
+
+	err = transport->set_iface_param(shost, data,
+					 ev->u.set_iface_params.count);
+	scsi_host_put(shost);
+	return err;
+}
+
 static int
 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
 {
@@ -1696,6 +1720,9 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
 	case ISCSI_UEVENT_PATH_UPDATE:
 		err = iscsi_set_path(transport, ev);
 		break;
+	case ISCSI_UEVENT_SET_IFACE_PARAMS:
+		err = iscsi_set_iface_params(transport, ev);
+		break;
 	default:
 		err = -ENOSYS;
 		break;