5e8b011af50e69cc4100a6f9fa3312a8bdfa5db4
[linux-2.6.git] / drivers / scsi / libfc / fc_elsct.c
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 - sends ELS/CT frame
33  */
34 static struct fc_seq *fc_elsct_send(struct fc_lport *lport,
35                                     u32 did,
36                                     struct fc_frame *fp,
37                                     unsigned int op,
38                                     void (*resp)(struct fc_seq *,
39                                                  struct fc_frame *fp,
40                                                  void *arg),
41                                     void *arg, u32 timer_msec)
42 {
43         enum fc_rctl r_ctl;
44         enum fc_fh_type fh_type;
45         int rc;
46
47         /* ELS requests */
48         if ((op >= ELS_LS_RJT) && (op <= ELS_AUTH_ELS))
49                 rc = fc_els_fill(lport, did, fp, op, &r_ctl, &fh_type);
50         else {
51                 /* CT requests */
52                 rc = fc_ct_fill(lport, fp, op, &r_ctl, &fh_type);
53                 did = FC_FID_DIR_SERV;
54         }
55
56         if (rc)
57                 return NULL;
58
59         fc_fill_fc_hdr(fp, r_ctl, did, fc_host_port_id(lport->host), fh_type,
60                        FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
61
62         return lport->tt.exch_seq_send(lport, fp, resp, NULL, arg, timer_msec);
63 }
64
65 int fc_elsct_init(struct fc_lport *lport)
66 {
67         if (!lport->tt.elsct_send)
68                 lport->tt.elsct_send = fc_elsct_send;
69
70         return 0;
71 }
72 EXPORT_SYMBOL(fc_elsct_init);