target_core_alua: Referrals infrastructure

[cascardo/linux.git] / drivers / target / target_core_spc.c

diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c
index 603c411..f9889fd 100644 (file)
--- a/drivers/target/target_core_spc.c
+++ b/drivers/target/target_core_spc.c
@@ -267,7 +267,7 @@ check_t10_vend_desc:
        port = lun->lun_sep;
        if (port) {
                struct t10_alua_lu_gp *lu_gp;
-               u32 padding, scsi_name_len;
+               u32 padding, scsi_name_len, scsi_target_len;
                u16 lu_gp_id = 0;
                u16 tg_pt_gp_id = 0;
                u16 tpgt;
@@ -402,6 +402,47 @@ check_scsi_name:
                off += scsi_name_len;
                /* Header size + Designation descriptor */
                len += (scsi_name_len + 4);
+
+               /*
+                * Target device designator
+                */
+               buf[off] =
+                       (tpg->se_tpg_tfo->get_fabric_proto_ident(tpg) << 4);
+               buf[off++] |= 0x3; /* CODE SET == UTF-8 */
+               buf[off] = 0x80; /* Set PIV=1 */
+               /* Set ASSOCIATION == target device: 10b */
+               buf[off] |= 0x20;
+               /* DESIGNATOR TYPE == SCSI name string */
+               buf[off++] |= 0x8;
+               off += 2; /* Skip over Reserved and length */
+               /*
+                * SCSI name string identifer containing, $FABRIC_MOD
+                * dependent information.  For LIO-Target and iSCSI
+                * Target Port, this means "<iSCSI name>" in
+                * UTF-8 encoding.
+                */
+               scsi_target_len = sprintf(&buf[off], "%s",
+                                         tpg->se_tpg_tfo->tpg_get_wwn(tpg));
+               scsi_target_len += 1 /* Include  NULL terminator */;
+               /*
+                * The null-terminated, null-padded (see 4.4.2) SCSI
+                * NAME STRING field contains a UTF-8 format string.
+                * The number of bytes in the SCSI NAME STRING field
+                * (i.e., the value in the DESIGNATOR LENGTH field)
+                * shall be no larger than 256 and shall be a multiple
+                * of four.
+                */
+               padding = ((-scsi_target_len) & 3);
+               if (padding)
+                       scsi_target_len += padding;
+               if (scsi_name_len > 256)
+                       scsi_name_len = 256;
+
+               buf[off-1] = scsi_target_len;
+               off += scsi_target_len;
+
+               /* Header size + Designation descriptor */
+               len += (scsi_target_len + 4);
        }
        buf[2] = ((len >> 8) & 0xff);
        buf[3] = (len & 0xff); /* Page Length for VPD 0x83 */
@@ -435,6 +476,11 @@ spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
        /* If WriteCache emulation is enabled, set V_SUP */
        if (spc_check_dev_wce(dev))
                buf[6] = 0x01;
+       /* If an LBA map is present set R_SUP */
+       spin_lock(&cmd->se_dev->t10_alua.lba_map_lock);
+       if (!list_empty(&dev->t10_alua.lba_map_list))
+               buf[8] = 0x10;
+       spin_unlock(&cmd->se_dev->t10_alua.lba_map_lock);
        return 0;
 }
 
@@ -593,6 +639,20 @@ spc_emulate_evpd_b2(struct se_cmd *cmd, unsigned char *buf)
        return 0;
 }
 
+/* Referrals VPD page */
+static sense_reason_t
+spc_emulate_evpd_b3(struct se_cmd *cmd, unsigned char *buf)
+{
+       struct se_device *dev = cmd->se_dev;
+
+       buf[0] = dev->transport->get_device_type(dev);
+       buf[3] = 0x0c;
+       put_unaligned_be32(dev->t10_alua.lba_map_segment_size, &buf[8]);
+       put_unaligned_be32(dev->t10_alua.lba_map_segment_size, &buf[12]);
+
+       return 0;
+}
+
 static sense_reason_t
 spc_emulate_evpd_00(struct se_cmd *cmd, unsigned char *buf);
 
@@ -607,6 +667,7 @@ static struct {
        { .page = 0xb0, .emulate = spc_emulate_evpd_b0 },
        { .page = 0xb1, .emulate = spc_emulate_evpd_b1 },
        { .page = 0xb2, .emulate = spc_emulate_evpd_b2 },
+       { .page = 0xb3, .emulate = spc_emulate_evpd_b3 },
 };
 
 /* supported vital product data pages */