[SCSI] scsi_transport_sas: add support for transport layer retries (TLR)

The mpt2sas driver wants to use transport layer retries (TLR) so the
simplest thing to do seems to be to add the enabling flags and checks
to the SAS transport class, since they're a SAS specific protocol
feature.

Signed-off-by: James Bottomley <James.Bottomley@suse.de>

2 files changed, 98 insertions, 7 deletions

diff --git a/drivers/scsi/scsi_sas_internal.h b/drivers/scsi/scsi_sas_internal.h
index 998cb5b..6266a5d 100644
--- a/drivers/scsi/scsi_sas_internal.h
+++ b/drivers/scsi/scsi_sas_internal.h
@@ -5,7 +5,7 @@
 #define SAS_PHY_ATTRS		17
 #define SAS_PORT_ATTRS		1
 #define SAS_RPORT_ATTRS		7
-#define SAS_END_DEV_ATTRS	3
+#define SAS_END_DEV_ATTRS	5
 #define SAS_EXPANDER_ATTRS	7
 
 struct sas_internal {
diff --git a/drivers/scsi/scsi_transport_sas.c b/drivers/scsi/scsi_transport_sas.c
index f27e52d..927e99c 100644
--- a/drivers/scsi/scsi_transport_sas.c
+++ b/drivers/scsi/scsi_transport_sas.c
@@ -155,6 +155,17 @@ static struct {
 sas_bitfield_name_search(linkspeed, sas_linkspeed_names)
 sas_bitfield_name_set(linkspeed, sas_linkspeed_names)
 
+static struct sas_end_device *sas_sdev_to_rdev(struct scsi_device *sdev)
+{
+	struct sas_rphy *rphy = target_to_rphy(sdev->sdev_target);
+	struct sas_end_device *rdev;
+
+	BUG_ON(rphy->identify.device_type != SAS_END_DEVICE);
+
+	rdev = rphy_to_end_device(rphy);
+	return rdev;
+}
+
 static void sas_smp_request(struct request_queue *q, struct Scsi_Host *shost,
 			    struct sas_rphy *rphy)
 {
@@ -358,6 +369,85 @@ void sas_remove_host(struct Scsi_Host *shost)
 }
 EXPORT_SYMBOL(sas_remove_host);
 
+/**
+ * sas_tlr_supported - checking TLR bit in vpd 0x90
+ * @sdev: scsi device struct
+ *
+ * Check Transport Layer Retries are supported or not.
+ * If vpd page 0x90 is present, TRL is supported.
+ *
+ */
+unsigned int
+sas_tlr_supported(struct scsi_device *sdev)
+{
+	const int vpd_len = 32;
+	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
+	char *buffer = kzalloc(vpd_len, GFP_KERNEL);
+	int ret = 0;
+
+	if (scsi_get_vpd_page(sdev, 0x90, buffer, vpd_len))
+		goto out;
+
+	/*
+	 * Magic numbers: the VPD Protocol page (0x90)
+	 * has a 4 byte header and then one entry per device port
+	 * the TLR bit is at offset 8 on each port entry
+	 * if we take the first port, that's at total offset 12
+	 */
+	ret = buffer[12] & 0x01;
+
+ out:
+	kfree(buffer);
+	rdev->tlr_supported = ret;
+	return ret;
+
+}
+EXPORT_SYMBOL_GPL(sas_tlr_supported);
+
+/**
+ * sas_disable_tlr - setting TLR flags
+ * @sdev: scsi device struct
+ *
+ * Seting tlr_enabled flag to 0.
+ *
+ */
+void
+sas_disable_tlr(struct scsi_device *sdev)
+{
+	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
+
+	rdev->tlr_enabled = 0;
+}
+EXPORT_SYMBOL_GPL(sas_disable_tlr);
+
+/**
+ * sas_enable_tlr - setting TLR flags
+ * @sdev: scsi device struct
+ *
+ * Seting tlr_enabled flag 1.
+ *
+ */
+void sas_enable_tlr(struct scsi_device *sdev)
+{
+	unsigned int tlr_supported = 0;
+	tlr_supported  = sas_tlr_supported(sdev);
+
+	if (tlr_supported) {
+		struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
+
+		rdev->tlr_enabled = 1;
+	}
+
+	return;
+}
+EXPORT_SYMBOL_GPL(sas_enable_tlr);
+
+unsigned int sas_is_tlr_enabled(struct scsi_device *sdev)
+{
+	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
+	return rdev->tlr_enabled;
+}
+EXPORT_SYMBOL_GPL(sas_is_tlr_enabled);
 
 /*
  * SAS Phy attributes
@@ -1146,15 +1236,10 @@ sas_rphy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
 int sas_read_port_mode_page(struct scsi_device *sdev)
 {
 	char *buffer = kzalloc(BUF_SIZE, GFP_KERNEL), *msdata;
-	struct sas_rphy *rphy = target_to_rphy(sdev->sdev_target);
-	struct sas_end_device *rdev;
+	struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
 	struct scsi_mode_data mode_data;
 	int res, error;
 
-	BUG_ON(rphy->identify.device_type != SAS_END_DEVICE);
-
-	rdev = rphy_to_end_device(rphy);
-
 	if (!buffer)
 		return -ENOMEM;
 
@@ -1207,6 +1292,10 @@ sas_end_dev_simple_attr(I_T_nexus_loss_timeout, I_T_nexus_loss_timeout,
 			"%d\n", int);
 sas_end_dev_simple_attr(initiator_response_timeout, initiator_response_timeout,
 			"%d\n", int);
+sas_end_dev_simple_attr(tlr_supported, tlr_supported,
+			"%d\n", int);
+sas_end_dev_simple_attr(tlr_enabled, tlr_enabled,
+			"%d\n", int);
 
 static DECLARE_TRANSPORT_CLASS(sas_expander_class,
 			       "sas_expander", NULL, NULL, NULL);
@@ -1733,6 +1822,8 @@ sas_attach_transport(struct sas_function_template *ft)
 	SETUP_END_DEV_ATTRIBUTE(end_dev_ready_led_meaning);
 	SETUP_END_DEV_ATTRIBUTE(end_dev_I_T_nexus_loss_timeout);
 	SETUP_END_DEV_ATTRIBUTE(end_dev_initiator_response_timeout);
+	SETUP_END_DEV_ATTRIBUTE(end_dev_tlr_supported);
+	SETUP_END_DEV_ATTRIBUTE(end_dev_tlr_enabled);
 	i->end_dev_attrs[count] = NULL;
 
 	count = 0;