1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright(c) 2008 Intel Corporation. All rights reserved.
4 *
5 * Maintained at www.Open-FCoE.org
6 */
7
8 /*
9 * Provide interface to send ELS/CT FC frames
10 */
11
12 #include <linux/export.h>
13 #include <asm/unaligned.h>
14 #include <scsi/fc/fc_gs.h>
15 #include <scsi/fc/fc_ns.h>
16 #include <scsi/fc/fc_els.h>
17 #include <scsi/libfc.h>
18 #include <scsi/fc_encode.h>
19 #include "fc_libfc.h"
20
21 /**
22 * fc_elsct_send() - Send an ELS or CT frame
23 * @lport: The local port to send the frame on
24 * @did: The destination ID for the frame
25 * @fp: The frame to be sent
26 * @op: The operational code
27 * @resp: The callback routine when the response is received
28 * @arg: The argument to pass to the response callback routine
29 * @timer_msec: The timeout period for the frame (in msecs)
30 */
31 struct fc_seq *fc_elsct_send(struct fc_lport *lport, u32 did,
32 struct fc_frame *fp, unsigned int op,
33 void (*resp)(struct fc_seq *,
34 struct fc_frame *,
35 void *),
36 void *arg, u32 timer_msec)
37 {
38 enum fc_rctl r_ctl;
39 enum fc_fh_type fh_type;
40 int rc;
41
42 /* ELS requests */
43 if ((op >= ELS_LS_RJT) && (op <= ELS_AUTH_ELS))
44 rc = fc_els_fill(lport, did, fp, op, &r_ctl, &fh_type);
45 else {
46 /* CT requests */
47 rc = fc_ct_fill(lport, did, fp, op, &r_ctl, &fh_type, &did);
48 }
49
50 if (rc) {
51 fc_frame_free(fp);
52 return NULL;
53 }
54
55 fc_fill_fc_hdr(fp, r_ctl, did, lport->port_id, fh_type,
56 FC_FCTL_REQ, 0);
57
58 return fc_exch_seq_send(lport, fp, resp, NULL, arg, timer_msec);
59 }
60 EXPORT_SYMBOL(fc_elsct_send);
61
62 /**
63 * fc_elsct_init() - Initialize the ELS/CT layer
64 * @lport: The local port to initialize the ELS/CT layer for
65 */
66 int fc_elsct_init(struct fc_lport *lport)
67 {
68 if (!lport->tt.elsct_send)
69 lport->tt.elsct_send = fc_elsct_send;
70
71 return 0;
72 }
73 EXPORT_SYMBOL(fc_elsct_init);
74
75 /**
76 * fc_els_resp_type() - Return a string describing the ELS response
77 * @fp: The frame pointer or possible error code
78 */
79 const char *fc_els_resp_type(struct fc_frame *fp)
80 {
81 const char *msg;
82 struct fc_frame_header *fh;
83 struct fc_ct_hdr *ct;
84
85 if (IS_ERR(fp)) {
86 switch (-PTR_ERR(fp)) {
87 case FC_NO_ERR:
88 msg = "response no error";
89 break;
90 case FC_EX_TIMEOUT:
91 msg = "response timeout";
92 break;
93 case FC_EX_CLOSED:
94 msg = "response closed";
95 break;
96 default:
97 msg = "response unknown error";
98 break;
99 }
100 } else {
101 fh = fc_frame_header_get(fp);
102 switch (fh->fh_type) {
103 case FC_TYPE_ELS:
104 switch (fc_frame_payload_op(fp)) {
105 case ELS_LS_ACC:
106 msg = "accept";
107 break;
108 case ELS_LS_RJT:
109 msg = "reject";
110 break;
111 default:
112 msg = "response unknown ELS";
113 break;
114 }
115 break;
116 case FC_TYPE_CT:
117 ct = fc_frame_payload_get(fp, sizeof(*ct));
118 if (ct) {
119 switch (ntohs(ct->ct_cmd)) {
120 case FC_FS_ACC:
121 msg = "CT accept";
122 break;
123 case FC_FS_RJT:
124 msg = "CT reject";
125 break;
126 default:
127 msg = "response unknown CT";
128 break;
129 }
130 } else {
131 msg = "short CT response";
132 }
133 break;
134 default:
135 msg = "response not ELS or CT";
136 break;
137 }
138 }
139 return msg;
140 }