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 <asm/unaligned.h> 25 #include <scsi/fc/fc_gs.h> 26 #include <scsi/fc/fc_ns.h> 27 #include <scsi/fc/fc_els.h> 28 #include <scsi/libfc.h> 29 #include <scsi/fc_encode.h> 30 31 /** 32 * fc_elsct_send() - Send an ELS or CT frame 33 * @lport: The local port to send the frame on 34 * @did: The destination ID for the frame 35 * @fp: The frame to be sent 36 * @op: The operational code 37 * @resp: The callback routine when the response is received 38 * @arg: The argument to pass to the response callback routine 39 * @timer_msec: The timeout period for the frame (in msecs) 40 */ 41 struct fc_seq *fc_elsct_send(struct fc_lport *lport, u32 did, 42 struct fc_frame *fp, unsigned int op, 43 void (*resp)(struct fc_seq *, 44 struct fc_frame *, 45 void *), 46 void *arg, u32 timer_msec) 47 { 48 enum fc_rctl r_ctl; 49 enum fc_fh_type fh_type; 50 int rc; 51 52 /* ELS requests */ 53 if ((op >= ELS_LS_RJT) && (op <= ELS_AUTH_ELS)) 54 rc = fc_els_fill(lport, did, fp, op, &r_ctl, &fh_type); 55 else { 56 /* CT requests */ 57 rc = fc_ct_fill(lport, did, fp, op, &r_ctl, &fh_type); 58 did = FC_FID_DIR_SERV; 59 } 60 61 if (rc) { 62 fc_frame_free(fp); 63 return NULL; 64 } 65 66 fc_fill_fc_hdr(fp, r_ctl, did, fc_host_port_id(lport->host), fh_type, 67 FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0); 68 69 return lport->tt.exch_seq_send(lport, fp, resp, NULL, arg, timer_msec); 70 } 71 EXPORT_SYMBOL(fc_elsct_send); 72 73 /** 74 * fc_elsct_init() - Initialize the ELS/CT layer 75 * @lport: The local port to initialize the ELS/CT layer for 76 */ 77 int fc_elsct_init(struct fc_lport *lport) 78 { 79 if (!lport->tt.elsct_send) 80 lport->tt.elsct_send = fc_elsct_send; 81 82 return 0; 83 } 84 EXPORT_SYMBOL(fc_elsct_init); 85 86 /** 87 * fc_els_resp_type() - Return a string describing the ELS response 88 * @fp: The frame pointer or possible error code 89 */ 90 const char *fc_els_resp_type(struct fc_frame *fp) 91 { 92 const char *msg; 93 struct fc_frame_header *fh; 94 struct fc_ct_hdr *ct; 95 96 if (IS_ERR(fp)) { 97 switch (-PTR_ERR(fp)) { 98 case FC_NO_ERR: 99 msg = "response no error"; 100 break; 101 case FC_EX_TIMEOUT: 102 msg = "response timeout"; 103 break; 104 case FC_EX_CLOSED: 105 msg = "response closed"; 106 break; 107 default: 108 msg = "response unknown error"; 109 break; 110 } 111 } else { 112 fh = fc_frame_header_get(fp); 113 switch (fh->fh_type) { 114 case FC_TYPE_ELS: 115 switch (fc_frame_payload_op(fp)) { 116 case ELS_LS_ACC: 117 msg = "accept"; 118 break; 119 case ELS_LS_RJT: 120 msg = "reject"; 121 break; 122 default: 123 msg = "response unknown ELS"; 124 break; 125 } 126 break; 127 case FC_TYPE_CT: 128 ct = fc_frame_payload_get(fp, sizeof(*ct)); 129 if (ct) { 130 switch (ntohs(ct->ct_cmd)) { 131 case FC_FS_ACC: 132 msg = "CT accept"; 133 break; 134 case FC_FS_RJT: 135 msg = "CT reject"; 136 break; 137 default: 138 msg = "response unknown CT"; 139 break; 140 } 141 } else { 142 msg = "short CT response"; 143 } 144 break; 145 default: 146 msg = "response not ELS or CT"; 147 break; 148 } 149 } 150 return msg; 151 } 152