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[iscsi] Eliminate polling while waiting for window to open 

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2011-06-24 18:07:41 +01:00
parent 3ad1a1a60a
commit bce34e87df
1 changed files with 26 additions and 3 deletions
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29
src/net/tcp/iscsi.c
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@ -1304,6 +1304,24 @@ static int iscsi_rx_login_response ( struct iscsi_session *iscsi,
*
*/
/**
* Pause TX engine
*
* @v iscsi iSCSI session
*/
static void iscsi_tx_pause ( struct iscsi_session *iscsi ) {
process_del ( &iscsi->process );
}
/**
* Resume TX engine
*
* @v iscsi iSCSI session
*/
static void iscsi_tx_resume ( struct iscsi_session *iscsi ) {
process_add ( &iscsi->process );
}
/**
* Start up a new TX PDU
*
@ -1324,7 +1342,7 @@ static void iscsi_start_tx ( struct iscsi_session *iscsi ) {
iscsi->tx_state = ISCSI_TX_BHS;
/* Start transmission process */
process_add ( &iscsi->process );
iscsi_tx_resume ( iscsi );
}
/**
@ -1405,7 +1423,7 @@ static void iscsi_tx_done ( struct iscsi_session *iscsi ) {
struct iscsi_bhs_common *common = &iscsi->tx_bhs.common;
/* Stop transmission process */
process_del ( &iscsi->process );
iscsi_tx_pause ( iscsi );
switch ( common->opcode & ISCSI_OPCODE_MASK ) {
case ISCSI_OPCODE_DATA_OUT:
@ -1468,7 +1486,10 @@ static void iscsi_tx_step ( struct iscsi_session *iscsi ) {
/* Check for window availability, if needed */
if ( tx_len && ( xfer_window ( &iscsi->socket ) == 0 ) ) {
/* Cannot transmit at this point; stop processing */
/* Cannot transmit at this point; pause
* processing and wait for window to reopen
*/
iscsi_tx_pause ( iscsi );
return;
}
@ -1696,6 +1717,8 @@ static int iscsi_vredirect ( struct iscsi_session *iscsi, int type,
/** iSCSI socket interface operations */
static struct interface_operation iscsi_socket_operations[] = {
INTF_OP ( xfer_deliver, struct iscsi_session *, iscsi_socket_deliver ),
INTF_OP ( xfer_window_changed, struct iscsi_session *,
iscsi_tx_resume ),
INTF_OP ( xfer_vredirect, struct iscsi_session *, iscsi_vredirect ),
INTF_OP ( intf_close, struct iscsi_session *, iscsi_close ),
};