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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright(c) 2008 Intel Corporation. All rights reserved.4 *5 * Maintained at www.Open-FCoE.org6 */7 8/*9 * Provide interface to send ELS/CT FC frames10 */11 12#include <linux/export.h>13#include <linux/unaligned.h>14#include <scsi/fc/fc_gs.h>15#include <scsi/fc/fc_ns.h>16#include <scsi/fc/fc_els.h>17#include <scsi/libfc.h>18#include "fc_encode.h"19#include "fc_libfc.h"20 21/**22 * fc_elsct_send() - Send an ELS or CT frame23 * @lport: The local port to send the frame on24 * @did: The destination ID for the frame25 * @fp: The frame to be sent26 * @op: The operational code27 * @resp: The callback routine when the response is received28 * @arg: The argument to pass to the response callback routine29 * @timer_msec: The timeout period for the frame (in msecs)30 */31struct fc_seq *fc_elsct_send(struct fc_lport *lport, u32 did,32 struct fc_frame *fp, unsigned int op,33 void (*resp)(struct fc_seq *,34 struct fc_frame *,35 void *),36 void *arg, u32 timer_msec)37{38 enum fc_rctl r_ctl;39 enum fc_fh_type fh_type;40 int rc;41 42 /* ELS requests */43 if ((op >= ELS_LS_RJT) && (op <= ELS_AUTH_ELS))44 rc = fc_els_fill(lport, did, fp, op, &r_ctl, &fh_type);45 else {46 /* CT requests */47 rc = fc_ct_fill(lport, did, fp, op, &r_ctl, &fh_type, &did);48 }49 50 if (rc) {51 fc_frame_free(fp);52 return NULL;53 }54 55 fc_fill_fc_hdr(fp, r_ctl, did, lport->port_id, fh_type,56 FC_FCTL_REQ, 0);57 58 return fc_exch_seq_send(lport, fp, resp, NULL, arg, timer_msec);59}60EXPORT_SYMBOL(fc_elsct_send);61 62/**63 * fc_elsct_init() - Initialize the ELS/CT layer64 * @lport: The local port to initialize the ELS/CT layer for65 */66int fc_elsct_init(struct fc_lport *lport)67{68 if (!lport->tt.elsct_send)69 lport->tt.elsct_send = fc_elsct_send;70 71 return 0;72}73EXPORT_SYMBOL(fc_elsct_init);74 75/**76 * fc_els_resp_type() - Return a string describing the ELS response77 * @fp: The frame pointer or possible error code78 */79const char *fc_els_resp_type(struct fc_frame *fp)80{81 const char *msg;82 struct fc_frame_header *fh;83 struct fc_ct_hdr *ct;84 85 if (IS_ERR(fp)) {86 switch (-PTR_ERR(fp)) {87 case FC_NO_ERR:88 msg = "response no error";89 break;90 case FC_EX_TIMEOUT:91 msg = "response timeout";92 break;93 case FC_EX_CLOSED:94 msg = "response closed";95 break;96 default:97 msg = "response unknown error";98 break;99 }100 } else {101 fh = fc_frame_header_get(fp);102 switch (fh->fh_type) {103 case FC_TYPE_ELS:104 switch (fc_frame_payload_op(fp)) {105 case ELS_LS_ACC:106 msg = "accept";107 break;108 case ELS_LS_RJT:109 msg = "reject";110 break;111 default:112 msg = "response unknown ELS";113 break;114 }115 break;116 case FC_TYPE_CT:117 ct = fc_frame_payload_get(fp, sizeof(*ct));118 if (ct) {119 switch (ntohs(ct->ct_cmd)) {120 case FC_FS_ACC:121 msg = "CT accept";122 break;123 case FC_FS_RJT:124 msg = "CT reject";125 break;126 default:127 msg = "response unknown CT";128 break;129 }130 } else {131 msg = "short CT response";132 }133 break;134 default:135 msg = "response not ELS or CT";136 break;137 }138 }139 return msg;140}141