[SCSI] mpt2sas: Driver will use sas address instead of handle as a lookup

The device driver was not handling updating device handles in all cases
across diag resets. To fix this issue, the driver is converted to using sas
address instead of handle as a lookup reference to the parent expander or
sas_host. Also, for both expanders and sas host, the phy handle will be one
unique handle. In the sas host case, the phy handle can be different for
every phy, so the change is to set the handle to the handle of the first
phy; every phy will be one single sas address(phy 0) instead of a different
sas address for every phy(previous implementation). So making one consistent
sas address for all the direct attachedports to the sas host, will make it
better user experience when using udev /dev/disk/by-path dev nodes

Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Signed-off-by: Eric Moore <Eric.moore@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 31 insertions, 41 deletions

diff --git a/drivers/scsi/mpt2sas/mpt2sas_transport.c b/drivers/scsi/mpt2sas/mpt2sas_transport.c
index eb98188c7f3f..8030bc2774c8 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_transport.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_transport.c
@@ -59,24 +59,23 @@
 
 #include "mpt2sas_base.h"
 /**
- * _transport_sas_node_find_by_handle - sas node search
+ * _transport_sas_node_find_by_sas_address - sas node search
  * @ioc: per adapter object
- * @handle: expander or hba handle (assigned by firmware)
+ * @sas_address: sas address of expander or sas host
  * Context: Calling function should acquire ioc->sas_node_lock.
  *
  * Search for either hba phys or expander device based on handle, then returns
  * the sas_node object.
  */
 static struct _sas_node *
-_transport_sas_node_find_by_handle(struct MPT2SAS_ADAPTER *ioc, u16 handle)
+_transport_sas_node_find_by_sas_address(struct MPT2SAS_ADAPTER *ioc,
+    u64 sas_address)
 {
-	int i;
-
-	for (i = 0; i < ioc->sas_hba.num_phys; i++)
-		if (ioc->sas_hba.phy[i].handle == handle)
-			return &ioc->sas_hba;
-
-	return mpt2sas_scsih_expander_find_by_handle(ioc, handle);
+	if (ioc->sas_hba.sas_address == sas_address)
+		return &ioc->sas_hba;
+	else
+		return mpt2sas_scsih_expander_find_by_sas_address(ioc,
+		    sas_address);
 }
 
 /**
@@ -469,7 +468,7 @@ _transport_expander_report_manufacture(struct MPT2SAS_ADAPTER *ioc,
  * mpt2sas_transport_port_add - insert port to the list
  * @ioc: per adapter object
  * @handle: handle of attached device
- * @parent_handle: parent handle(either hba or expander)
+ * @sas_address: sas address of parent expander or sas host
  * Context: This function will acquire ioc->sas_node_lock.
  *
  * Adding new port object to the sas_node->sas_port_list.
@@ -478,7 +477,7 @@ _transport_expander_report_manufacture(struct MPT2SAS_ADAPTER *ioc,
  */
 struct _sas_port *
 mpt2sas_transport_port_add(struct MPT2SAS_ADAPTER *ioc, u16 handle,
-    u16 parent_handle)
+    u64 sas_address)
 {
 	struct _sas_phy *mpt2sas_phy, *next;
 	struct _sas_port *mpt2sas_port;
@@ -488,9 +487,6 @@ mpt2sas_transport_port_add(struct MPT2SAS_ADAPTER *ioc, u16 handle,
 	int i;
 	struct sas_port *port;
 
-	if (!parent_handle)
-		return NULL;
-
 	mpt2sas_port = kzalloc(sizeof(struct _sas_port),
 	    GFP_KERNEL);
 	if (!mpt2sas_port) {
@@ -502,17 +498,16 @@ mpt2sas_transport_port_add(struct MPT2SAS_ADAPTER *ioc, u16 handle,
 	INIT_LIST_HEAD(&mpt2sas_port->port_list);
 	INIT_LIST_HEAD(&mpt2sas_port->phy_list);
 	spin_lock_irqsave(&ioc->sas_node_lock, flags);
-	sas_node = _transport_sas_node_find_by_handle(ioc, parent_handle);
+	sas_node = _transport_sas_node_find_by_sas_address(ioc, sas_address);
 	spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
 
 	if (!sas_node) {
-		printk(MPT2SAS_ERR_FMT "%s: Could not find parent(0x%04x)!\n",
-		    ioc->name, __func__, parent_handle);
+		printk(MPT2SAS_ERR_FMT "%s: Could not find "
+		    "parent sas_address(0x%016llx)!\n", ioc->name,
+		    __func__, (unsigned long long)sas_address);
 		goto out_fail;
 	}
 
-	mpt2sas_port->handle = parent_handle;
-	mpt2sas_port->sas_address = sas_node->sas_address;
 	if ((_transport_set_identify(ioc, handle,
 	    &mpt2sas_port->remote_identify))) {
 		printk(MPT2SAS_ERR_FMT "failure at %s:%d/%s()!\n",
@@ -604,7 +599,7 @@ mpt2sas_transport_port_add(struct MPT2SAS_ADAPTER *ioc, u16 handle,
  * mpt2sas_transport_port_remove - remove port from the list
  * @ioc: per adapter object
  * @sas_address: sas address of attached device
- * @parent_handle: handle to the upstream parent(either hba or expander)
+ * @sas_address_parent: sas address of parent expander or sas host
  * Context: This function will acquire ioc->sas_node_lock.
  *
  * Removing object and freeing associated memory from the
@@ -614,7 +609,7 @@ mpt2sas_transport_port_add(struct MPT2SAS_ADAPTER *ioc, u16 handle,
  */
 void
 mpt2sas_transport_port_remove(struct MPT2SAS_ADAPTER *ioc, u64 sas_address,
-    u16 parent_handle)
+    u64 sas_address_parent)
 {
 	int i;
 	unsigned long flags;
@@ -624,7 +619,8 @@ mpt2sas_transport_port_remove(struct MPT2SAS_ADAPTER *ioc, u64 sas_address,
 	struct _sas_phy *mpt2sas_phy, *next_phy;
 
 	spin_lock_irqsave(&ioc->sas_node_lock, flags);
-	sas_node = _transport_sas_node_find_by_handle(ioc, parent_handle);
+	sas_node = _transport_sas_node_find_by_sas_address(ioc,
+	    sas_address_parent);
 	spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
 	if (!sas_node)
 		return;
@@ -650,8 +646,7 @@ mpt2sas_transport_port_remove(struct MPT2SAS_ADAPTER *ioc, u64 sas_address,
 	    &mpt2sas_port->phy_list, port_siblings) {
 		if ((ioc->logging_level & MPT_DEBUG_TRANSPORT))
 			dev_printk(KERN_INFO, &mpt2sas_port->port->dev,
-			    "remove: parent_handle(0x%04x), "
-			    "sas_addr(0x%016llx), phy(%d)\n", parent_handle,
+			    "remove: sas_addr(0x%016llx), phy(%d)\n",
 			    (unsigned long long)
 			    mpt2sas_port->remote_identify.sas_address,
 			    mpt2sas_phy->phy_id);
@@ -799,8 +794,8 @@ mpt2sas_transport_add_expander_phy(struct MPT2SAS_ADAPTER *ioc, struct _sas_phy
 /**
  * mpt2sas_transport_update_links - refreshing phy link changes
  * @ioc: per adapter object
- * @handle: handle to sas_host or expander
- * @attached_handle: attached device handle
+ * @sas_address: sas address of parent expander or sas host
+ * @handle: attached device handle
  * @phy_numberv: phy number
  * @link_rate: new link rate
  *
@@ -808,28 +803,25 @@ mpt2sas_transport_add_expander_phy(struct MPT2SAS_ADAPTER *ioc, struct _sas_phy
  */
 void
 mpt2sas_transport_update_links(struct MPT2SAS_ADAPTER *ioc,
-    u16 handle, u16 attached_handle, u8 phy_number, u8 link_rate)
+     u64 sas_address, u16 handle, u8 phy_number, u8 link_rate)
 {
 	unsigned long flags;
 	struct _sas_node *sas_node;
 	struct _sas_phy *mpt2sas_phy;
 
-	if (ioc->shost_recovery) {
-		printk(MPT2SAS_INFO_FMT "%s: host reset in progress!\n",
-			__func__, ioc->name);
+	if (ioc->shost_recovery)
 		return;
-	}
 
 	spin_lock_irqsave(&ioc->sas_node_lock, flags);
-	sas_node = _transport_sas_node_find_by_handle(ioc, handle);
+	sas_node = _transport_sas_node_find_by_sas_address(ioc, sas_address);
 	spin_unlock_irqrestore(&ioc->sas_node_lock, flags);
 	if (!sas_node)
 		return;
 
 	mpt2sas_phy = &sas_node->phy[phy_number];
-	mpt2sas_phy->attached_handle = attached_handle;
-	if (attached_handle && (link_rate >= MPI2_SAS_NEG_LINK_RATE_1_5))
-		_transport_set_identify(ioc, mpt2sas_phy->attached_handle,
+	mpt2sas_phy->attached_handle = handle;
+	if (handle && (link_rate >= MPI2_SAS_NEG_LINK_RATE_1_5))
+		_transport_set_identify(ioc, handle,
 		    &mpt2sas_phy->remote_identify);
 	else
 		memset(&mpt2sas_phy->remote_identify, 0 , sizeof(struct
@@ -841,13 +833,11 @@ mpt2sas_transport_update_links(struct MPT2SAS_ADAPTER *ioc,
 
 	if ((ioc->logging_level & MPT_DEBUG_TRANSPORT))
 		dev_printk(KERN_INFO, &mpt2sas_phy->phy->dev,
-		    "refresh: handle(0x%04x), sas_addr(0x%016llx),\n"
+		    "refresh: parent sas_addr(0x%016llx),\n"
 		    "\tlink_rate(0x%02x), phy(%d)\n"
 		    "\tattached_handle(0x%04x), sas_addr(0x%016llx)\n",
-		    handle, (unsigned long long)
-		    mpt2sas_phy->identify.sas_address, link_rate,
-		    phy_number, attached_handle,
-		    (unsigned long long)
+		    (unsigned long long)sas_address,
+		    link_rate, phy_number, handle, (unsigned long long)
 		    mpt2sas_phy->remote_identify.sas_address);
 }