v4.19.13 snapshot.
diff --git a/drivers/scsi/libfc/fc_elsct.c b/drivers/scsi/libfc/fc_elsct.c
new file mode 100644
index 0000000..6384a98
--- /dev/null
+++ b/drivers/scsi/libfc/fc_elsct.c
@@ -0,0 +1,152 @@
+/*
+ * Copyright(c) 2008 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+/*
+ * Provide interface to send ELS/CT FC frames
+ */
+
+#include <linux/export.h>
+#include <asm/unaligned.h>
+#include <scsi/fc/fc_gs.h>
+#include <scsi/fc/fc_ns.h>
+#include <scsi/fc/fc_els.h>
+#include <scsi/libfc.h>
+#include <scsi/fc_encode.h>
+#include "fc_libfc.h"
+
+/**
+ * fc_elsct_send() - Send an ELS or CT frame
+ * @lport: The local port to send the frame on
+ * @did: The destination ID for the frame
+ * @fp: The frame to be sent
+ * @op: The operational code
+ * @resp: The callback routine when the response is received
+ * @arg: The argument to pass to the response callback routine
+ * @timer_msec: The timeout period for the frame (in msecs)
+ */
+struct fc_seq *fc_elsct_send(struct fc_lport *lport, u32 did,
+ struct fc_frame *fp, unsigned int op,
+ void (*resp)(struct fc_seq *,
+ struct fc_frame *,
+ void *),
+ void *arg, u32 timer_msec)
+{
+ enum fc_rctl r_ctl;
+ enum fc_fh_type fh_type;
+ int rc;
+
+ /* ELS requests */
+ if ((op >= ELS_LS_RJT) && (op <= ELS_AUTH_ELS))
+ rc = fc_els_fill(lport, did, fp, op, &r_ctl, &fh_type);
+ else {
+ /* CT requests */
+ rc = fc_ct_fill(lport, did, fp, op, &r_ctl, &fh_type, &did);
+ }
+
+ if (rc) {
+ fc_frame_free(fp);
+ return NULL;
+ }
+
+ fc_fill_fc_hdr(fp, r_ctl, did, lport->port_id, fh_type,
+ FC_FCTL_REQ, 0);
+
+ return fc_exch_seq_send(lport, fp, resp, NULL, arg, timer_msec);
+}
+EXPORT_SYMBOL(fc_elsct_send);
+
+/**
+ * fc_elsct_init() - Initialize the ELS/CT layer
+ * @lport: The local port to initialize the ELS/CT layer for
+ */
+int fc_elsct_init(struct fc_lport *lport)
+{
+ if (!lport->tt.elsct_send)
+ lport->tt.elsct_send = fc_elsct_send;
+
+ return 0;
+}
+EXPORT_SYMBOL(fc_elsct_init);
+
+/**
+ * fc_els_resp_type() - Return a string describing the ELS response
+ * @fp: The frame pointer or possible error code
+ */
+const char *fc_els_resp_type(struct fc_frame *fp)
+{
+ const char *msg;
+ struct fc_frame_header *fh;
+ struct fc_ct_hdr *ct;
+
+ if (IS_ERR(fp)) {
+ switch (-PTR_ERR(fp)) {
+ case FC_NO_ERR:
+ msg = "response no error";
+ break;
+ case FC_EX_TIMEOUT:
+ msg = "response timeout";
+ break;
+ case FC_EX_CLOSED:
+ msg = "response closed";
+ break;
+ default:
+ msg = "response unknown error";
+ break;
+ }
+ } else {
+ fh = fc_frame_header_get(fp);
+ switch (fh->fh_type) {
+ case FC_TYPE_ELS:
+ switch (fc_frame_payload_op(fp)) {
+ case ELS_LS_ACC:
+ msg = "accept";
+ break;
+ case ELS_LS_RJT:
+ msg = "reject";
+ break;
+ default:
+ msg = "response unknown ELS";
+ break;
+ }
+ break;
+ case FC_TYPE_CT:
+ ct = fc_frame_payload_get(fp, sizeof(*ct));
+ if (ct) {
+ switch (ntohs(ct->ct_cmd)) {
+ case FC_FS_ACC:
+ msg = "CT accept";
+ break;
+ case FC_FS_RJT:
+ msg = "CT reject";
+ break;
+ default:
+ msg = "response unknown CT";
+ break;
+ }
+ } else {
+ msg = "short CT response";
+ }
+ break;
+ default:
+ msg = "response not ELS or CT";
+ break;
+ }
+ }
+ return msg;
+}