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@@ -23,6 +23,7 @@
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#include <linux/scatterlist.h>
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#include <linux/scatterlist.h>
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#include <linux/blk-mq.h>
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#include <linux/blk-mq.h>
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#include <linux/ratelimit.h>
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#include <linux/ratelimit.h>
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+#include <asm/unaligned.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_cmnd.h>
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@@ -3294,3 +3295,50 @@ next_desig:
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return id_size;
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return id_size;
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}
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}
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EXPORT_SYMBOL(scsi_vpd_lun_id);
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EXPORT_SYMBOL(scsi_vpd_lun_id);
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+
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+/*
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+ * scsi_vpd_tpg_id - return a target port group identifier
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+ * @sdev: SCSI device
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+ *
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+ * Returns the Target Port Group identifier from the information
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+ * froom VPD page 0x83 of the device.
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+ *
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+ * Returns the identifier or error on failure.
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+ */
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+int scsi_vpd_tpg_id(struct scsi_device *sdev, int *rel_id)
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+{
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+ unsigned char *d;
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+ unsigned char __rcu *vpd_pg83;
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+ int group_id = -EAGAIN, rel_port = -1;
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+
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+ rcu_read_lock();
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+ vpd_pg83 = rcu_dereference(sdev->vpd_pg83);
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+ if (!vpd_pg83) {
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+ rcu_read_unlock();
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+ return -ENXIO;
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+ }
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+
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+ d = sdev->vpd_pg83 + 4;
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+ while (d < sdev->vpd_pg83 + sdev->vpd_pg83_len) {
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+ switch (d[1] & 0xf) {
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+ case 0x4:
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+ /* Relative target port */
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+ rel_port = get_unaligned_be16(&d[6]);
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+ break;
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+ case 0x5:
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+ /* Target port group */
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+ group_id = get_unaligned_be16(&d[6]);
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+ break;
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+ default:
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+ break;
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+ }
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+ d += d[3] + 4;
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+ }
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+ rcu_read_unlock();
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+
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+ if (group_id >= 0 && rel_id && rel_port != -1)
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+ *rel_id = rel_port;
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+
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+ return group_id;
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+}
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+EXPORT_SYMBOL(scsi_vpd_tpg_id);
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