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Annotation of qemu/roms/ipxe/src/net/fcns.c, revision 1.1

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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