[SCSI] scsi_transport_sas: add unindexed ports

Some SAS HBAs don't want to go to the trouble of tracking port numbers,
so they'd simply like to say "add this port and give it a number".
This is especially beneficial from the hotplug point of view, since
tracking ports and the available number space can be a real pain.

The current implementation uses an incrementing number per expander to
add the port on.  However, since there can never be more ports than
there are phys, a later implementation will try to be more intelligent
about this.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/include/scsi/scsi_transport_sas.h b/include/scsi/scsi_transport_sas.h
index e3c503cd175e..f5772ff61d0d 100644
--- a/include/scsi/scsi_transport_sas.h
+++ b/include/scsi/scsi_transport_sas.h
@@ -106,6 +106,7 @@ struct sas_end_device {
 
 struct sas_expander_device {
         int    level;
+        int    next_port_id;
 
         #define SAS_EXPANDER_VENDOR_ID_LEN      8
         char   vendor_id[SAS_EXPANDER_VENDOR_ID_LEN+1];
@@ -127,7 +128,7 @@ struct sas_expander_device {
 struct sas_port {
         struct device           dev;
 
-        u8                      port_identifier;
+        int                     port_identifier;
         int                     num_phys;
 
         /* the other end of the link */
@@ -168,6 +169,7 @@ extern void sas_rphy_delete(struct sas_rphy *);
 extern int scsi_is_sas_rphy(const struct device *);
 
 struct sas_port *sas_port_alloc(struct device *, int);
+struct sas_port *sas_port_alloc_num(struct device *);
 int sas_port_add(struct sas_port *);
 void sas_port_free(struct sas_port *);
 void sas_port_delete(struct sas_port *);