VPD descriptor association 0x2 in VPD page 0x83 identification
descrioptors can be used to identify the array / target device.
Some tricks need to be taken for EMC and HP, which put the
array identification into the standard inquiry.
Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
---
drivers/scsi/device_handler/scsi_dh_alua.c | 123 ++++++++++++++++++++++++++++-
1 file changed, 119 insertions(+), 4 deletions(-)
diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index 0af6866..857a999 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -69,6 +69,9 @@ static DEFINE_SPINLOCK(port_group_lock);
struct alua_port_group {
struct kref kref;
struct list_head node;
+ unsigned char target_id[256];
+ unsigned char target_id_str[256];
+ int target_id_size;
int group_id;
int tpgs;
int state;
@@ -351,12 +354,14 @@ static int alua_vpd_inquiry(struct scsi_device *sdev, struct alua_dh_data *h)
unsigned char bufflen = 36;
int len, timeout = ALUA_FAILOVER_TIMEOUT;
unsigned char sense[SCSI_SENSE_BUFFERSIZE];
+ char target_id_str[256], *target_id = NULL;
+ int target_id_size;
struct scsi_sense_hdr sense_hdr;
unsigned retval, err;
int group_id = -1;
unsigned char *d;
unsigned long expiry;
- struct alua_port_group *pg = NULL;
+ struct alua_port_group *tmp_pg, *pg = NULL;
expiry = round_jiffies_up(jiffies + timeout);
retry:
@@ -409,9 +414,54 @@ static int alua_vpd_inquiry(struct scsi_device *sdev, struct alua_dh_data *h)
/*
* Now look for the correct descriptor.
*/
+ memset(target_id_str, 0, 256);
+ target_id_size = 0;
d = buff + 4;
while (d < buff + len) {
switch (d[1] & 0xf) {
+ case 0x2:
+ /* EUI-64 */
+ if ((d[1] & 0x30) == 0x20) {
+ target_id_size = d[3];
+ target_id = d + 4;
+ switch (target_id_size) {
+ case 8:
+ sprintf(target_id_str,
+ "eui.%8phN", d + 4);
+ break;
+ case 12:
+ sprintf(target_id_str,
+ "eui.%12phN", d + 4);
+ break;
+ case 16:
+ sprintf(target_id_str,
+ "eui.%16phN", d + 4);
+ break;
+ default:
+ target_id_size = 0;
+ break;
+ }
+ }
+ break;
+ case 0x3:
+ /* NAA */
+ if ((d[1] & 0x30) == 0x20) {
+ target_id_size = d[3];
+ target_id = d + 4;
+ switch (target_id_size) {
+ case 8:
+ sprintf(target_id_str,
+ "naa.%8phN", d + 4);
+ break;
+ case 16:
+ sprintf(target_id_str,
+ "naa.%16phN", d + 4);
+ break;
+ default:
+ target_id_size = 0;
+ break;
+ }
+ }
case 0x4:
/* Relative target port */
h->rel_port = (d[6] << 8) + d[7];
@@ -420,6 +470,18 @@ static int alua_vpd_inquiry(struct scsi_device *sdev, struct alua_dh_data *h)
/* Target port group */
group_id = (d[6] << 8) + d[7];
break;
+ case 0x8:
+ /* SCSI name string */
+ if ((d[1] & 0x30) == 0x20) {
+ /* SCSI name */
+ target_id_size = d[3];
+ target_id = d + 4;
+ strncpy(target_id_str, d + 4, 256);
+ if (target_id_size > 255)
+ target_id_size = 255;
+ target_id_str[target_id_size] = '\0';
+ }
+ break;
default:
break;
}
@@ -439,11 +501,56 @@ static int alua_vpd_inquiry(struct scsi_device *sdev, struct alua_dh_data *h)
err = SCSI_DH_DEV_UNSUPP;
goto out;
}
+ if (!target_id_size) {
+ /* Check for EMC Clariion extended inquiry */
+ if (!strncmp(sdev->vendor, "DGC ", 8) &&
+ sdev->inquiry_len > 160) {
+ target_id_size = sdev->inquiry[160];
+ target_id = sdev->inquiry + 161;
+ strcpy(target_id_str, "emc.");
+ memcpy(target_id_str + 4, target_id, target_id_size);
+ }
+ /* Check for HP EVA extended inquiry */
+ if (!strncmp(sdev->vendor, "HP ", 8) &&
+ !strncmp(sdev->model, "HSV", 3) &&
+ sdev->inquiry_len > 170) {
+ target_id_size = 16;
+ target_id = sdev->inquiry + 154;
+ strcpy(target_id_str, "naa.");
+ memcpy(target_id_str + 4, target_id, target_id_size);
+ }
+ }
- sdev_printk(KERN_INFO, sdev,
- "%s: port group %02x rel port %02x\n",
- ALUA_DH_NAME, group_id, h->rel_port);
spin_lock(&port_group_lock);
+ pg = NULL;
+ if (target_id_size) {
+ sdev_printk(KERN_INFO, sdev,
+ "%s: target %s port group %02x "
+ "rel port %02x\n", ALUA_DH_NAME,
+ target_id_str, group_id, h->rel_port);
+ list_for_each_entry(tmp_pg, &port_group_list, node) {
+ if (tmp_pg->group_id != group_id)
+ continue;
+ if (tmp_pg->target_id_size != target_id_size)
+ continue;
+ if (memcmp(tmp_pg->target_id, target_id,
+ target_id_size))
+ continue;
+ pg = tmp_pg;
+ break;
+ }
+ } else {
+ sdev_printk(KERN_INFO, sdev,
+ "%s: port group %02x rel port %02x\n",
+ ALUA_DH_NAME, group_id, h->rel_port);
+ }
+ if (pg) {
+ h->pg = pg;
+ kref_get(&pg->kref);
+ spin_unlock(&port_group_lock);
+ err = SCSI_DH_OK;
+ goto out;
+ }
pg = kzalloc(sizeof(struct alua_port_group), GFP_KERNEL);
if (!pg) {
sdev_printk(KERN_WARNING, sdev,
@@ -454,6 +561,14 @@ static int alua_vpd_inquiry(struct scsi_device *sdev, struct alua_dh_data *h)
err = SCSI_DH_DEV_TEMP_BUSY;
goto out;
}
+ if (target_id_size) {
+ memcpy(pg->target_id, target_id, target_id_size);
+ strncpy(pg->target_id_str, target_id_str, 256);
+ } else {
+ memset(pg->target_id, 0, 256);
+ pg->target_id_str[0] = '\0';
+ }
+ pg->target_id_size = target_id_size;
pg->group_id = group_id;
pg->buff = pg->inq;
pg->bufflen = ALUA_INQUIRY_SIZE;
--
1.7.12.4
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