blob: c2384d501470123a119f4fcd61fadd9ba7aacc24 [file] [log] [blame]
Robert Love42e9a922008-12-09 15:10:17 -08001/*
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
Paul Gortmaker09703662011-05-27 09:37:25 -040024#include <linux/export.h>
Robert Love42e9a922008-12-09 15:10:17 -080025#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>
Bart Van Asschec6b21c92012-01-13 17:26:20 -080031#include "fc_libfc.h"
Robert Love42e9a922008-12-09 15:10:17 -080032
Robert Love3a3b42b2009-11-03 11:47:39 -080033/**
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)
Robert Love42e9a922008-12-09 15:10:17 -080042 */
Robert Love3a3b42b2009-11-03 11:47:39 -080043struct 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)
Robert Love42e9a922008-12-09 15:10:17 -080049{
50 enum fc_rctl r_ctl;
Robert Love42e9a922008-12-09 15:10:17 -080051 enum fc_fh_type fh_type;
52 int rc;
53
54 /* ELS requests */
55 if ((op >= ELS_LS_RJT) && (op <= ELS_AUTH_ELS))
Joe Eykholta46f3272009-08-25 14:00:55 -070056 rc = fc_els_fill(lport, did, fp, op, &r_ctl, &fh_type);
57 else {
Robert Love42e9a922008-12-09 15:10:17 -080058 /* CT requests */
Neerav Parikh1ea2c1d2012-01-22 17:30:00 -080059 rc = fc_ct_fill(lport, did, fp, op, &r_ctl, &fh_type, &did);
Joe Eykholta46f3272009-08-25 14:00:55 -070060 }
Robert Love42e9a922008-12-09 15:10:17 -080061
Chris Leech8f550f92009-10-21 16:28:09 -070062 if (rc) {
63 fc_frame_free(fp);
Robert Love42e9a922008-12-09 15:10:17 -080064 return NULL;
Chris Leech8f550f92009-10-21 16:28:09 -070065 }
Robert Love42e9a922008-12-09 15:10:17 -080066
Robert Love7b2787e2010-05-07 15:18:41 -070067 fc_fill_fc_hdr(fp, r_ctl, did, lport->port_id, fh_type,
Joe Eykholt24f089e2010-07-20 15:21:01 -070068 FC_FCTL_REQ, 0);
Robert Love42e9a922008-12-09 15:10:17 -080069
70 return lport->tt.exch_seq_send(lport, fp, resp, NULL, arg, timer_msec);
71}
Chris Leech11b56182009-11-03 11:46:29 -080072EXPORT_SYMBOL(fc_elsct_send);
Robert Love42e9a922008-12-09 15:10:17 -080073
Robert Love3a3b42b2009-11-03 11:47:39 -080074/**
75 * fc_elsct_init() - Initialize the ELS/CT layer
76 * @lport: The local port to initialize the ELS/CT layer for
77 */
Robert Love42e9a922008-12-09 15:10:17 -080078int 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}
85EXPORT_SYMBOL(fc_elsct_init);
Joe Eykholtf657d292009-08-25 14:03:21 -070086
87/**
Robert Love3a3b42b2009-11-03 11:47:39 -080088 * fc_els_resp_type() - Return a string describing the ELS response
89 * @fp: The frame pointer or possible error code
Joe Eykholtf657d292009-08-25 14:03:21 -070090 */
91const char *fc_els_resp_type(struct fc_frame *fp)
92{
93 const char *msg;
Joe Eykholt52a66902009-11-03 11:49:00 -080094 struct fc_frame_header *fh;
95 struct fc_ct_hdr *ct;
96
Joe Eykholtf657d292009-08-25 14:03:21 -070097 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 {
Joe Eykholt52a66902009-11-03 11:49:00 -0800113 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 }
Joe Eykholtf657d292009-08-25 14:03:21 -0700127 break;
Joe Eykholt52a66902009-11-03 11:49:00 -0800128 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 }
Joe Eykholtf657d292009-08-25 14:03:21 -0700145 break;
146 default:
Joe Eykholt52a66902009-11-03 11:49:00 -0800147 msg = "response not ELS or CT";
Joe Eykholtf657d292009-08-25 14:03:21 -0700148 break;
149 }
150 }
151 return msg;
152}