[SCSI] libfc: add fcoe_fc_els_lesb to fc_fcoe.h for FC-BB-5 LESB definitions

Add struct fcoe_fc_els_lesb as described in FC-BB-5 LESB for FCoE. It has
the same size as LESB defined in FC-FS-3 (struct fc_els_lesb) but members
have different meanings according to FC-BB-5.
Signed-off-by: Yi Zou <yi.zou@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

include/scsi/fc/fc_fcoe.h

@@ -85,6 +85,18 @@ struct fcoe_crc_eof {
  */
 #define FCOE_MIN_FRAME 46
 
+/*
+ * FCoE Link Error Status Block: T11 FC-BB-5 Rev2.0, Clause 7.10.
+ */
+struct fcoe_fc_els_lesb {
+	__be32		lesb_link_fail;	/* link failure count */
+	__be32		lesb_vlink_fail; /* virtual link failure count */
+	__be32		lesb_miss_fka;	/* missing FIP keep-alive count */
+	__be32		lesb_symb_err;	/* symbol error during carrier count */
+	__be32		lesb_err_block;	/* errored block count */
+	__be32		lesb_fcs_error; /* frame check sequence error count */
+};
+
 /*
  * fc_fcoe_set_mac - Store OUI + DID into MAC address field.
  * @mac: mac address to be set