Add linux-next specific files for 20110831
[linux-2.6/next.git] / drivers / scsi / libfc / fc_elsct.c
blobfb9161dc4ca67411f07413018562286fcaeff017
1 /*
2 * Copyright(c) 2008 Intel Corporation. All rights reserved.
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.
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.
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.
17 * Maintained at www.Open-FCoE.org
21 * Provide interface to send ELS/CT FC frames
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>
32 /**
33 * fc_elsct_send() - Send an ELS or CT frame
34 * @lport: The local port to send the frame on
35 * @did: The destination ID for the frame
36 * @fp: The frame to be sent
37 * @op: The operational code
38 * @resp: The callback routine when the response is received
39 * @arg: The argument to pass to the response callback routine
40 * @timer_msec: The timeout period for the frame (in msecs)
42 struct fc_seq *fc_elsct_send(struct fc_lport *lport, u32 did,
43 struct fc_frame *fp, unsigned int op,
44 void (*resp)(struct fc_seq *,
45 struct fc_frame *,
46 void *),
47 void *arg, u32 timer_msec)
49 enum fc_rctl r_ctl;
50 enum fc_fh_type fh_type;
51 int rc;
53 /* ELS requests */
54 if ((op >= ELS_LS_RJT) && (op <= ELS_AUTH_ELS))
55 rc = fc_els_fill(lport, did, fp, op, &r_ctl, &fh_type);
56 else {
57 /* CT requests */
58 rc = fc_ct_fill(lport, did, fp, op, &r_ctl, &fh_type);
59 did = FC_FID_DIR_SERV;
62 if (rc) {
63 fc_frame_free(fp);
64 return NULL;
67 fc_fill_fc_hdr(fp, r_ctl, did, lport->port_id, fh_type,
68 FC_FCTL_REQ, 0);
70 return lport->tt.exch_seq_send(lport, fp, resp, NULL, arg, timer_msec);
72 EXPORT_SYMBOL(fc_elsct_send);
74 /**
75 * fc_elsct_init() - Initialize the ELS/CT layer
76 * @lport: The local port to initialize the ELS/CT layer for
78 int fc_elsct_init(struct fc_lport *lport)
80 if (!lport->tt.elsct_send)
81 lport->tt.elsct_send = fc_elsct_send;
83 return 0;
85 EXPORT_SYMBOL(fc_elsct_init);
87 /**
88 * fc_els_resp_type() - Return a string describing the ELS response
89 * @fp: The frame pointer or possible error code
91 const char *fc_els_resp_type(struct fc_frame *fp)
93 const char *msg;
94 struct fc_frame_header *fh;
95 struct fc_ct_hdr *ct;
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;
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;
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;
142 } else {
143 msg = "short CT response";
145 break;
146 default:
147 msg = "response not ELS or CT";
148 break;
151 return msg;