Create a sysfs entry that reports the negotiated DIX/DIF protection mode
for a SCSI disk. This depends on the protection type the disk is
formatted with as well as the protection capabilities advertised by the
controller.
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
---
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index c158e61..ca0ffc3 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -259,6 +259,28 @@ sd_show_protection_type(struct device *dev, struct device_attribute *attr,
}
static ssize_t
+sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct scsi_disk *sdkp = to_scsi_disk(dev);
+ struct scsi_device *sdp = sdkp->device;
+ unsigned int dif, dix;
+
+ dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
+ dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
+
+ if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
+ dif = 0;
+ dix = 1;
+ }
+
+ if (!dif && !dix)
+ return snprintf(buf, 20, "none\n");
+
+ return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
+}
+
+static ssize_t
sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
char *buf)
{
@@ -285,6 +307,7 @@ static struct device_attribute sd_disk_attrs[] = {
__ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
sd_store_manage_start_stop),
__ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
+ __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
__ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
__ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
__ATTR_NULL,
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