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1.1 root 1: /*
2: * Copyright (C) 2010 Michael Brown <[email protected]>.
3: *
4: * This program is free software; you can redistribute it and/or
5: * modify it under the terms of the GNU General Public License as
6: * published by the Free Software Foundation; either version 2 of the
7: * License, or any later version.
8: *
9: * This program is distributed in the hope that it will be useful, but
10: * WITHOUT ANY WARRANTY; without even the implied warranty of
11: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12: * General Public License for more details.
13: *
14: * You should have received a copy of the GNU General Public License
15: * along with this program; if not, write to the Free Software
16: * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17: */
18:
19: FILE_LICENCE ( GPL2_OR_LATER );
20:
21: #include <stddef.h>
22: #include <stdlib.h>
23: #include <string.h>
24: #include <errno.h>
25: #include <byteswap.h>
26: #include <ipxe/interface.h>
27: #include <ipxe/iobuf.h>
28: #include <ipxe/process.h>
29: #include <ipxe/xfer.h>
30: #include <ipxe/fc.h>
31: #include <ipxe/fcns.h>
32:
33: /** @file
34: *
35: * Fibre Channel name server lookups
36: *
37: */
38:
39: /** A Fibre Channel name server query */
40: struct fc_ns_query {
41: /** Reference count */
42: struct refcnt refcnt;
43: /** Fibre Channel exchange */
44: struct interface xchg;
45:
46: /** Fibre Channel peer */
47: struct fc_peer *peer;
48: /** Fibre Channel port */
49: struct fc_port *port;
50:
51: /** Process */
52: struct process process;
53: /** Success handler
54: *
55: * @v peer Fibre Channel peer
56: * @v port Fibre Channel port
57: * @v peer_port_id Peer port ID
58: * @ret rc Return status code
59: */
60: int ( * done ) ( struct fc_peer *peer, struct fc_port *port,
61: struct fc_port_id *peer_port_id );
62: };
63:
64: /**
65: * Free name server query
66: *
67: * @v refcnt Reference count
68: */
69: static void fc_ns_query_free ( struct refcnt *refcnt ) {
70: struct fc_ns_query *query =
71: container_of ( refcnt, struct fc_ns_query, refcnt );
72:
73: fc_peer_put ( query->peer );
74: fc_port_put ( query->port );
75: free ( query );
76: }
77:
78: /**
79: * Close name server query
80: *
81: * @v query Name server query
82: * @v rc Reason for close
83: */
84: static void fc_ns_query_close ( struct fc_ns_query *query, int rc ) {
85:
86: /* Stop process */
87: process_del ( &query->process );
88:
89: /* Shut down interfaces */
90: intf_shutdown ( &query->xchg, rc );
91: }
92:
93: /**
94: * Receive name server query response
95: *
96: * @v query Name server query
97: * @v iobuf I/O buffer
98: * @v meta Data transfer metadata
99: * @ret rc Return status code
100: */
101: static int fc_ns_query_deliver ( struct fc_ns_query *query,
102: struct io_buffer *iobuf,
103: struct xfer_metadata *meta __unused ) {
104: union fc_ns_response *resp = iobuf->data;
105: struct fc_port_id *peer_port_id;
106: int rc;
107:
108: /* Sanity check */
109: if ( iob_len ( iobuf ) < sizeof ( resp->ct ) ) {
110: DBGC ( query, "FCNS %p received underlength response (%zd "
111: "bytes)\n", query, iob_len ( iobuf ) );
112: rc = -EINVAL;
113: goto done;
114: }
115:
116: /* Handle response */
117: switch ( ntohs ( resp->ct.code ) ) {
118: case FC_GS_ACCEPT:
119: if ( iob_len ( iobuf ) < sizeof ( resp->gid_pn ) ) {
120: DBGC ( query, "FCNS %p received underlength accept "
121: "response (%zd bytes)\n",
122: query, iob_len ( iobuf ) );
123: rc = -EINVAL;
124: goto done;
125: }
126: peer_port_id = &resp->gid_pn.port_id.port_id;
127: DBGC ( query, "FCNS %p resolved %s to %s via %s\n",
128: query, fc_ntoa ( &query->peer->port_wwn ),
129: fc_id_ntoa ( peer_port_id ), query->port->name );
130: if ( ( rc = query->done ( query->peer, query->port,
131: peer_port_id ) ) != 0 )
132: goto done;
133: break;
134: case FC_GS_REJECT:
135: DBGC ( query, "FCNS %p rejected (reason %02x explanation "
136: "%02x)\n", query, resp->reject.ct.reason,
137: resp->reject.ct.explanation );
138: break;
139: default:
140: DBGC ( query, "FCNS %p received invalid response code %04x\n",
141: query, ntohs ( resp->ct.code ) );
142: rc = -ENOTSUP;
143: goto done;
144: }
145:
146: rc = 0;
147: done:
148: free_iob ( iobuf );
149: fc_ns_query_close ( query, rc );
150: return rc;
151: }
152:
153: /**
154: * Name server query process
155: *
156: * @v process Process
157: */
158: static void fc_ns_query_step ( struct process *process ) {
159: struct fc_ns_query *query =
160: container_of ( process, struct fc_ns_query, process );
161: struct xfer_metadata meta;
162: struct fc_ns_gid_pn_request gid_pn;
163: int xchg_id;
164: int rc;
165:
166: /* Stop process */
167: process_del ( &query->process );
168:
169: /* Create exchange */
170: if ( ( xchg_id = fc_xchg_originate ( &query->xchg, query->port,
171: &fc_gs_port_id,
172: FC_TYPE_CT ) ) < 0 ) {
173: rc = xchg_id;
174: DBGC ( query, "FCNS %p could not create exchange: %s\n",
175: query, strerror ( rc ) );
176: fc_ns_query_close ( query, rc );
177: return;
178: }
179:
180: /* Construct query request */
181: memset ( &gid_pn, 0, sizeof ( gid_pn ) );
182: gid_pn.ct.revision = FC_CT_REVISION;
183: gid_pn.ct.type = FC_GS_TYPE_DS;
184: gid_pn.ct.subtype = FC_DS_SUBTYPE_NAME;
185: gid_pn.ct.code = htons ( FC_NS_GET ( FC_NS_PORT_NAME, FC_NS_PORT_ID ));
186: memcpy ( &gid_pn.port_wwn, &query->peer->port_wwn,
187: sizeof ( gid_pn.port_wwn ) );
188: memset ( &meta, 0, sizeof ( meta ) );
189: meta.flags = XFER_FL_OVER;
190:
191: /* Send query */
192: if ( ( rc = xfer_deliver_raw_meta ( &query->xchg, &gid_pn,
193: sizeof ( gid_pn ), &meta ) ) != 0){
194: DBGC ( query, "FCNS %p could not deliver query: %s\n",
195: query, strerror ( rc ) );
196: fc_ns_query_close ( query, rc );
197: return;
198: }
199: }
200:
201: /** Name server exchange interface operations */
202: static struct interface_operation fc_ns_query_xchg_op[] = {
203: INTF_OP ( xfer_deliver, struct fc_ns_query *, fc_ns_query_deliver ),
204: INTF_OP ( intf_close, struct fc_ns_query *, fc_ns_query_close ),
205: };
206:
207: /** Name server exchange interface descriptor */
208: static struct interface_descriptor fc_ns_query_xchg_desc =
209: INTF_DESC ( struct fc_ns_query, xchg, fc_ns_query_xchg_op );
210:
211: /**
212: * Issue Fibre Channel name server query
213: *
214: * @v peer Fibre Channel peer
215: * @v port Fibre Channel port
216: * @ret rc Return status code
217: */
218: int fc_ns_query ( struct fc_peer *peer, struct fc_port *port,
219: int ( * done ) ( struct fc_peer *peer, struct fc_port *port,
220: struct fc_port_id *peer_port_id ) ) {
221: struct fc_ns_query *query;
222:
223: /* Allocate and initialise structure */
224: query = zalloc ( sizeof ( *query ) );
225: if ( ! query )
226: return -ENOMEM;
227: ref_init ( &query->refcnt, fc_ns_query_free );
228: intf_init ( &query->xchg, &fc_ns_query_xchg_desc, &query->refcnt );
229: process_init ( &query->process, fc_ns_query_step, &query->refcnt );
230: query->peer = fc_peer_get ( peer );
231: query->port = fc_port_get ( port );
232: query->done = done;
233:
234: DBGC ( query, "FCNS %p querying %s via %s\n",
235: query, fc_ntoa ( &query->peer->port_wwn ), port->name );
236:
237: /* Mortalise self and return */
238: ref_put ( &query->refcnt );
239: return 0;
240: }
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