1 /* 2 * Copyright(c) 2008 Intel Corporation. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms and conditions of the GNU General Public License, 6 * version 2, as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 * 13 * You should have received a copy of the GNU General Public License along with 14 * this program; if not, write to the Free Software Foundation, Inc., 15 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 16 * 17 * Maintained at www.Open-FCoE.org 18 */ 19 20 /* 21 * Provide interface to send ELS/CT FC frames 22 */ 23 24 #include <linux/export.h> 25 #include <asm/unaligned.h> 26 #include <scsi/fc/fc_gs.h> 27 #include <scsi/fc/fc_ns.h> 28 #include <scsi/fc/fc_els.h> 29 #include <scsi/libfc.h> 30 #include <scsi/fc_encode.h> 31 #include "fc_libfc.h" 32 33 /** 34 * fc_elsct_send() - Send an ELS or CT frame 35 * @lport: The local port to send the frame on 36 * @did: The destination ID for the frame 37 * @fp: The frame to be sent 38 * @op: The operational code 39 * @resp: The callback routine when the response is received 40 * @arg: The argument to pass to the response callback routine 41 * @timer_msec: The timeout period for the frame (in msecs) 42 */ 43 struct fc_seq *fc_elsct_send(struct fc_lport *lport, u32 did, 44 struct fc_frame *fp, unsigned int op, 45 void (*resp)(struct fc_seq *, 46 struct fc_frame *, 47 void *), 48 void *arg, u32 timer_msec) 49 { 50 enum fc_rctl r_ctl; 51 enum fc_fh_type fh_type; 52 int rc; 53 54 /* ELS requests */ 55 if ((op >= ELS_LS_RJT) && (op <= ELS_AUTH_ELS)) 56 rc = fc_els_fill(lport, did, fp, op, &r_ctl, &fh_type); 57 else { 58 /* CT requests */ 59 rc = fc_ct_fill(lport, did, fp, op, &r_ctl, &fh_type, &did); 60 } 61 62 if (rc) { 63 fc_frame_free(fp); 64 return NULL; 65 } 66 67 fc_fill_fc_hdr(fp, r_ctl, did, lport->port_id, fh_type, 68 FC_FCTL_REQ, 0); 69 70 return lport->tt.exch_seq_send(lport, fp, resp, NULL, arg, timer_msec); 71 } 72 EXPORT_SYMBOL(fc_elsct_send); 73 74 /** 75 * fc_elsct_init() - Initialize the ELS/CT layer 76 * @lport: The local port to initialize the ELS/CT layer for 77 */ 78 int fc_elsct_init(struct fc_lport *lport) 79 { 80 if (!lport->tt.elsct_send) 81 lport->tt.elsct_send = fc_elsct_send; 82 83 return 0; 84 } 85 EXPORT_SYMBOL(fc_elsct_init); 86 87 /** 88 * fc_els_resp_type() - Return a string describing the ELS response 89 * @fp: The frame pointer or possible error code 90 */ 91 const char *fc_els_resp_type(struct fc_frame *fp) 92 { 93 const char *msg; 94 struct fc_frame_header *fh; 95 struct fc_ct_hdr *ct; 96 97 if (IS_ERR(fp)) { 98 switch (-PTR_ERR(fp)) { 99 case FC_NO_ERR: 100 msg = "response no error"; 101 break; 102 case FC_EX_TIMEOUT: 103 msg = "response timeout"; 104 break; 105 case FC_EX_CLOSED: 106 msg = "response closed"; 107 break; 108 default: 109 msg = "response unknown error"; 110 break; 111 } 112 } else { 113 fh = fc_frame_header_get(fp); 114 switch (fh->fh_type) { 115 case FC_TYPE_ELS: 116 switch (fc_frame_payload_op(fp)) { 117 case ELS_LS_ACC: 118 msg = "accept"; 119 break; 120 case ELS_LS_RJT: 121 msg = "reject"; 122 break; 123 default: 124 msg = "response unknown ELS"; 125 break; 126 } 127 break; 128 case FC_TYPE_CT: 129 ct = fc_frame_payload_get(fp, sizeof(*ct)); 130 if (ct) { 131 switch (ntohs(ct->ct_cmd)) { 132 case FC_FS_ACC: 133 msg = "CT accept"; 134 break; 135 case FC_FS_RJT: 136 msg = "CT reject"; 137 break; 138 default: 139 msg = "response unknown CT"; 140 break; 141 } 142 } else { 143 msg = "short CT response"; 144 } 145 break; 146 default: 147 msg = "response not ELS or CT"; 148 break; 149 } 150 } 151 return msg; 152 } 153