Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6] / 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                                     struct fc_rport *rport,
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         u32 did;
45         enum fc_fh_type fh_type;
46         int rc;
47
48         /* ELS requests */
49         if ((op >= ELS_LS_RJT) && (op <= ELS_AUTH_ELS))
50                 rc = fc_els_fill(lport, rport, fp, op, &r_ctl, &did, &fh_type);
51         else
52                 /* CT requests */
53                 rc = fc_ct_fill(lport, fp, op, &r_ctl, &did, &fh_type);
54
55         if (rc)
56                 return NULL;
57
58         fc_fill_fc_hdr(fp, r_ctl, did, fc_host_port_id(lport->host), fh_type,
59                        FC_FC_FIRST_SEQ | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
60
61         return lport->tt.exch_seq_send(lport, fp, resp, NULL, arg, timer_msec);
62 }
63
64 int fc_elsct_init(struct fc_lport *lport)
65 {
66         if (!lport->tt.elsct_send)
67                 lport->tt.elsct_send = fc_elsct_send;
68
69         return 0;
70 }
71 EXPORT_SYMBOL(fc_elsct_init);