Moved to net/tcp/iscsi.c.
This commit is contained in:
Michael Brown
parent
5080668704
commit
21493646c2
@ -1,545 +0,0 @@
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#include <stddef.h>
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#include <string.h>
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#include <vsprintf.h>
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#include <assert.h>
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#include <byteswap.h>
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#include <gpxe/iscsi.h>
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/** @file
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*
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* iSCSI protocol
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*
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*/
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/****************************************************************************
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*
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* Utility functions
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*
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*/
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/**
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* Start up a new TX PDU
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*
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* @v iscsi iSCSI session
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*
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* This initiates the process of sending a new PDU. Only one PDU may
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* be in transit at any one time.
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*/
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static void iscsi_start_tx ( struct iscsi_session *iscsi ) {
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assert ( iscsi->tx_state == ISCSI_TX_IDLE );
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iscsi->tx_state = ISCSI_TX_BHS;
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iscsi->tx_offset = 0;
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}
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/**
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* Mark session as failed
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*
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* @v iscsi iSCSI session
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*
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* This marks the session as permanently failed. The session will not
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* be automatically logged back in.
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*/
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static void iscsi_fail ( struct iscsi_session *iscsi ) {
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iscsi->state = ISCSI_STATE_FAILED;
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tcp_close ( &iscsi->tcp );
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}
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/****************************************************************************
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*
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* iSCSI SCSI command issuing
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*
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*/
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/**
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* Start up a block read
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*
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* @v iscsi iSCSI session
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*
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*/
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static void iscsi_start_read_block ( struct iscsi_session *iscsi ) {
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struct iscsi_bhs_scsi_command *command = &iscsi->tx_bhs.scsi_command;
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struct scsi_cdb_read_10 *read = &command->cdb.read_10;
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assert ( iscsi->block_size != 0 );
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assert ( iscsi->block_count != 0 );
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assert ( iscsi->block_read_callback != NULL );
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/* Construct BHS */
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memset ( command, 0, sizeof ( *command ) );
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command->opcode = ISCSI_OPCODE_SCSI_COMMAND;
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command->flags = ( ISCSI_FLAG_FINAL |
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ISCSI_COMMAND_FLAG_READ |
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ISCSI_COMMAND_ATTR_SIMPLE );
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/* lengths left as zero */
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/* lun left as zero, on the assumption that no-one uses LUNs > 0 */
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command->itt = htonl ( iscsi->itt );
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command->exp_len = htonl ( iscsi->block_count * iscsi->block_size );
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command->cmdsn = htonl ( iscsi->cmdsn );
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command->expstatsn = htonl ( iscsi->statsn + 1 );
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read->opcode = SCSI_OPCODE_READ_10;
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read->lba = htonl ( iscsi->block_start );
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read->len = htons ( iscsi->block_count );
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iscsi->state = ISCSI_STATE_READING_DATA;
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iscsi_start_tx ( iscsi );
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}
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/**
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* Receive data segment of an iSCSI data-in PDU
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*
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* @v iscsi iSCSI session
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* @v data Received data
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* @v len Length of received data
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* @v remaining Data remaining after this data
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*
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*/
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static void iscsi_rx_data_in ( struct iscsi_session *iscsi, void *data,
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size_t len, size_t remaining ) {
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struct iscsi_bhs_data_in *data_in = &iscsi->rx_bhs.data_in;
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unsigned long offset;
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/* Update cmdsn and statsn */
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iscsi->cmdsn = ntohl ( data_in->expcmdsn );
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iscsi->statsn = ntohl ( data_in->statsn );
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/* Process data via callback */
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offset = ntohl ( data_in->offset ) + iscsi->rx_offset;
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iscsi->block_read_callback ( iscsi->block_read_private,
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data, offset, len );
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/* If this is the end, mark state as idle */
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if ( ( data_in->flags & ISCSI_FLAG_FINAL ) && ( remaining == 0 ) )
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iscsi->state = ISCSI_STATE_IDLE;
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}
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/****************************************************************************
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*
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* iSCSI login
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*
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*/
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/**
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* Build iSCSI login request strings
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*
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* @v iscsi iSCSI session
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*
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* These are the initial set of strings sent in the first login
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* request PDU.
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*/
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static int iscsi_build_login_request_strings ( struct iscsi_session *iscsi,
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void *data, size_t len ) {
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return snprintf ( data, len,
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"InitiatorName=%s:initiator%c"
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"TargetName=%s%c"
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"MaxRecvDataSegmentLength=512%c"
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"SessionType=Normal%c"
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"DataDigest=None%c"
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"HeaderDigest=None%c",
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iscsi->initiator, 0, iscsi->target, 0,
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0, 0, 0, 0 );
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}
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/**
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* Transmit data segment of an iSCSI login request PDU
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*
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* @v iscsi iSCSI session
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*
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* For login requests, the data segment consists of the login strings.
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*/
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static void iscsi_tx_login_request ( struct iscsi_session *iscsi ) {
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int len;
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len = iscsi_build_login_request_strings ( iscsi, tcp_buffer,
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tcp_buflen );
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tcp_send ( &iscsi->tcp, tcp_buffer + iscsi->tx_offset,
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len - iscsi->tx_offset );
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}
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/**
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* Start up a login request
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*
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* @v iscsi iSCSI session
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*
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*/
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static void iscsi_start_login ( struct iscsi_session *iscsi ) {
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struct iscsi_bhs_login_request *request = &iscsi->tx_bhs.login_request;
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int len;
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/* Construct login request BHS */
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memset ( request, 0, sizeof ( *request ) );
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request->opcode = ( ISCSI_OPCODE_LOGIN_REQUEST |
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ISCSI_FLAG_IMMEDIATE );
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request->flags = ( ISCSI_LOGIN_FLAG_TRANSITION |
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ISCSI_LOGIN_CSG_OPERATIONAL_NEGOTIATION |
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ISCSI_LOGIN_NSG_FULL_FEATURE_PHASE );
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/* version_max and version_min left as zero */
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len = iscsi_build_login_request_strings ( iscsi, NULL, 0 );
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ISCSI_SET_LENGTHS ( request->lengths, 0, len );
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request->isid_iana_en = htonl ( ISCSI_ISID_IANA |
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IANA_EN_FEN_SYSTEMS );
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/* isid_iana_qual left as zero */
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request->tsih = htons ( iscsi->tsih );
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/* itt left as zero */
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/* cid left as zero */
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request->cmdsn = htonl ( iscsi->cmdsn );
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request->expstatsn = htonl ( iscsi->statsn + 1 );
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iscsi->state = ISCSI_STATE_LOGGING_IN;
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iscsi_start_tx ( iscsi );
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}
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/**
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* Receive data segment of an iSCSI login response PDU
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*
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* @v iscsi iSCSI session
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* @v data Received data
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* @v len Length of received data
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* @v remaining Data remaining after this data
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*
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*/
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static void iscsi_rx_login_response ( struct iscsi_session *iscsi,
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void *data __unused,
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size_t len __unused,
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size_t remaining __unused ) {
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struct iscsi_bhs_login_request *request = &iscsi->tx_bhs.login_request;
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struct iscsi_bhs_login_response *response
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= &iscsi->rx_bhs.login_response;
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/* Sanity check */
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if ( iscsi->state != ISCSI_STATE_LOGGING_IN ) {
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printf ( "Spurious iSCSI login response\n" );
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iscsi_fail ( iscsi );
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return;
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}
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/* Check for fatal errors */
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if ( response->status_class != 0 ) {
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printf ( "iSCSI login failure: class %02x detail %02x\n",
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response->status_class, response->status_detail );
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iscsi_fail ( iscsi );
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return;
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}
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/* Update cmdsn and statsn */
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iscsi->cmdsn = ntohl ( response->expcmdsn );
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iscsi->statsn = ntohl ( response->statsn );
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/* If server did not transition, we send it another login
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* request with empty strings.
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*/
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if ( ! ( response->flags & ISCSI_LOGIN_FLAG_TRANSITION ) ) {
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ISCSI_SET_LENGTHS ( request->lengths, 0, 0 );
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iscsi_start_tx ( iscsi );
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return;
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}
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/* Record TSIH for future reference */
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iscsi->tsih = ntohl ( response->tsih );
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/* Start reading data */
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iscsi_start_read_block ( iscsi );
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}
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/****************************************************************************
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*
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* iSCSI to TCP interface
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*
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*/
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static inline struct iscsi_session *
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tcp_to_iscsi ( struct tcp_connection *conn ) {
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return container_of ( conn, struct iscsi_session, tcp );
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}
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static void iscsi_closed ( struct tcp_connection *conn, int status ) {
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struct iscsi_session *iscsi = tcp_to_iscsi ( conn );
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}
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static void iscsi_connected ( struct tcp_connection *conn ) {
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struct iscsi_session *iscsi = tcp_to_iscsi ( conn );
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/* Prepare to receive PDUs. */
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iscsi->rx_state = ISCSI_RX_BHS;
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iscsi->rx_offset = 0;
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/* TX state should already have been set up */
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assert ( iscsi->tx_state != ISCSI_TX_IDLE );
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assert ( iscsi->tx_offset == 0 );
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}
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/**
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* Transmit data segment of an iSCSI PDU
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*
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* @v iscsi iSCSI session
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*
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* Handle transmission of part of a PDU data segment. iscsi::tx_bhs
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* will be valid when this is called.
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*/
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static void iscsi_tx_data ( struct iscsi_session *iscsi ) {
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struct iscsi_bhs_common *common = &iscsi->tx_bhs.common;
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switch ( common->opcode & ISCSI_OPCODE_MASK ) {
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case ISCSI_OPCODE_LOGIN_REQUEST:
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iscsi_tx_login_request ( iscsi );
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break;
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default:
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assert ( 0 );
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break;
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}
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}
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/**
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* Handle TCP ACKs
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*
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* @v iscsi iSCSI session
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*
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* Updates iscsi->tx_offset and, if applicable, transitions to the
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* next TX state.
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*/
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static void iscsi_acked ( struct tcp_connection *conn, size_t len ) {
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struct iscsi_session *iscsi = tcp_to_iscsi ( conn );
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struct iscsi_bhs_common *common = &iscsi->tx_bhs.common;
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size_t max_tx_offset;
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enum iscsi_tx_state next_state;
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iscsi->tx_offset += len;
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while ( 1 ) {
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switch ( iscsi->tx_state ) {
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case ISCSI_TX_BHS:
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max_tx_offset = sizeof ( iscsi->tx_bhs );
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next_state = ISCSI_TX_AHS;
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break;
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case ISCSI_TX_AHS:
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max_tx_offset = 4 * ISCSI_AHS_LEN ( common->lengths );
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next_state = ISCSI_TX_DATA;
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break;
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case ISCSI_TX_DATA:
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max_tx_offset = ISCSI_DATA_LEN ( common->lengths );
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next_state = ISCSI_TX_DATA_PADDING;
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break;
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case ISCSI_TX_DATA_PADDING:
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max_tx_offset = ISCSI_DATA_PAD_LEN ( common->lengths );
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next_state = ISCSI_TX_IDLE;
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break;
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case ISCSI_TX_IDLE:
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return;
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default:
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assert ( 0 );
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return;
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}
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assert ( iscsi->tx_offset <= max_tx_offset );
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/* If the whole of the current portion has not yet
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* been acked, stay in this state for now.
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*/
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if ( iscsi->tx_offset != max_tx_offset )
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return;
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iscsi->tx_state = next_state;
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iscsi->tx_offset = 0;
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}
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}
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/**
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* Transmit iSCSI PDU
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*
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* @v iscsi iSCSI session
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*
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* Constructs data to be sent for the current TX state
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*/
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static void iscsi_senddata ( struct tcp_connection *conn ) {
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struct iscsi_session *iscsi = tcp_to_iscsi ( conn );
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struct iscsi_bhs_common *common = &iscsi->tx_bhs.common;
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static const char pad[] = { '\0', '\0', '\0' };
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switch ( iscsi->tx_state ) {
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case ISCSI_TX_IDLE:
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/* Do nothing */
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break;
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case ISCSI_TX_BHS:
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tcp_send ( conn, &iscsi->tx_bhs.bytes[iscsi->tx_offset],
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( sizeof ( iscsi->tx_bhs ) - iscsi->tx_offset ) );
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break;
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case ISCSI_TX_AHS:
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/* We don't yet have an AHS transmission mechanism */
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assert ( 0 );
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break;
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case ISCSI_TX_DATA:
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iscsi_tx_data ( iscsi );
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break;
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case ISCSI_TX_DATA_PADDING:
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tcp_send ( conn, pad, ( ISCSI_DATA_PAD_LEN ( common->lengths )
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- iscsi->tx_offset ) );
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break;
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default:
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assert ( 0 );
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break;
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}
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}
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/**
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* Receive data segment of an iSCSI PDU
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*
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* @v iscsi iSCSI session
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* @v data Received data
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* @v len Length of received data
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* @v remaining Data remaining after this data
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*
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* Handle processing of part of a PDU data segment. iscsi::rx_bhs
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* will be valid when this is called.
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*/
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static void iscsi_rx_data ( struct iscsi_session *iscsi, void *data,
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size_t len, size_t remaining ) {
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struct iscsi_bhs_common *common = &iscsi->rx_bhs.common;
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switch ( common->opcode & ISCSI_OPCODE_MASK ) {
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case ISCSI_OPCODE_LOGIN_RESPONSE:
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iscsi_rx_login_response ( iscsi, data, len, remaining );
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break;
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case ISCSI_OPCODE_DATA_IN:
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iscsi_rx_data_in ( iscsi, data, len, remaining );
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break;
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default:
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printf ( "Unknown iSCSI opcode %02x\n", common->opcode );
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break;
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}
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}
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/**
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* Discard portion of an iSCSI PDU.
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*
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* @v iscsi iSCSI session
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* @v data Received data
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* @v len Length of received data
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* @v remaining Data remaining after this data
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*
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* This discards data from a portion of a received PDU.
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*/
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static void iscsi_rx_discard ( struct iscsi_session *iscsi __unused,
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void *data __unused, size_t len __unused,
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size_t remaining __unused ) {
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/* Do nothing */
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}
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/**
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* Receive basic header segment of an iSCSI PDU
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*
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* @v iscsi iSCSI session
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* @v data Received data
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* @v len Length of received data
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* @v remaining Data remaining after this data
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*
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* This fills in iscsi::rx_bhs with the data from the BHS portion of
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* the received PDU.
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*/
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static void iscsi_rx_bhs ( struct iscsi_session *iscsi, void *data,
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size_t len, size_t remaining __unused ) {
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memcpy ( &iscsi->rx_bhs.bytes[iscsi->rx_offset], data, len );
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}
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/**
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* Receive new data
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*
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* @v tcp TCP connection
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* @v data Received data
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* @v len Length of received data
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*
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* This handles received PDUs. The receive strategy is to fill in
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* iscsi::rx_bhs with the contents of the BHS portion of the PDU,
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* throw away any AHS portion, and then process each part of the data
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* portion as it arrives. The data processing routine therefore
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* always has a full copy of the BHS available, even for portions of
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* the data in different packets to the BHS.
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*/
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static void iscsi_newdata ( struct tcp_connection *conn, void *data,
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size_t len ) {
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struct iscsi_session *iscsi = tcp_to_iscsi ( conn );
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struct iscsi_bhs_common *common = &iscsi->rx_bhs.common;
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void ( *process ) ( struct iscsi_session *iscsi, void *data,
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size_t len, size_t remaining );
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size_t max_rx_offset;
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enum iscsi_rx_state next_state;
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size_t frag_len;
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size_t remaining;
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while ( 1 ) {
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switch ( iscsi->rx_state ) {
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case ISCSI_RX_BHS:
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process = iscsi_rx_bhs;
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max_rx_offset = sizeof ( iscsi->rx_bhs );
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next_state = ISCSI_RX_AHS;
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break;
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case ISCSI_RX_AHS:
|
||||
process = iscsi_rx_discard;
|
||||
max_rx_offset = 4 * ISCSI_AHS_LEN ( common->lengths );
|
||||
next_state = ISCSI_RX_DATA;
|
||||
break;
|
||||
case ISCSI_RX_DATA:
|
||||
process = iscsi_rx_data;
|
||||
max_rx_offset = ISCSI_DATA_LEN ( common->lengths );
|
||||
next_state = ISCSI_RX_DATA_PADDING;
|
||||
break;
|
||||
case ISCSI_RX_DATA_PADDING:
|
||||
process = iscsi_rx_discard;
|
||||
max_rx_offset = ISCSI_DATA_PAD_LEN ( common->lengths );
|
||||
next_state = ISCSI_RX_BHS;
|
||||
break;
|
||||
default:
|
||||
assert ( 0 );
|
||||
return;
|
||||
}
|
||||
|
||||
frag_len = max_rx_offset - iscsi->rx_offset;
|
||||
if ( frag_len > len )
|
||||
frag_len = len;
|
||||
remaining = max_rx_offset - iscsi->rx_offset - frag_len;
|
||||
process ( iscsi, data, frag_len, remaining );
|
||||
|
||||
iscsi->rx_offset += frag_len;
|
||||
data += frag_len;
|
||||
len -= frag_len;
|
||||
|
||||
/* If all the data for this state has not yet been
|
||||
* received, stay in this state for now.
|
||||
*/
|
||||
if ( iscsi->rx_offset != max_rx_offset )
|
||||
return;
|
||||
|
||||
iscsi->rx_state = next_state;
|
||||
iscsi->rx_offset = 0;
|
||||
}
|
||||
}
|
||||
|
||||
/** iSCSI TCP operations */
|
||||
static struct tcp_operations iscsi_tcp_operations = {
|
||||
.closed = iscsi_closed,
|
||||
.connected = iscsi_connected,
|
||||
.acked = iscsi_acked,
|
||||
.newdata = iscsi_newdata,
|
||||
.senddata = iscsi_senddata,
|
||||
};
|
||||
|
||||
/**
|
||||
* Wake up session
|
||||
*
|
||||
* @v iscsi iSCSI session
|
||||
*
|
||||
*/
|
||||
void iscsi_wakeup ( struct iscsi_session *iscsi ) {
|
||||
iscsi->tcp.tcp_op = &iscsi_tcp_operations;
|
||||
|
||||
switch ( iscsi->state ) {
|
||||
case ISCSI_STATE_NOT_CONNECTED:
|
||||
case ISCSI_STATE_FAILED:
|
||||
tcp_connect ( &iscsi->tcp );
|
||||
iscsi_start_login ( iscsi );
|
||||
break;
|
||||
case ISCSI_STATE_IDLE:
|
||||
iscsi_start_read_block ( iscsi );
|
||||
break;
|
||||
default:
|
||||
/* Stay in same state */
|
||||
break;
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user