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[undi] Work around broken UNDI polling behaviour in winBoot/i

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Some dumb NBPs (e.g. emBoot's winBoot/i) never call PXENV_UNDI_ISR
with FuncFlag=PXENV_UNDI_ISR_START; they just sit in a tight polling
loop merrily violating the PXE spec with repeated calls to
PXENV_UNDI_ISR_IN_PROCESS.  Force a extra calls to netdev_poll() to
cope with these out-of-spec clients.
This commit is contained in:
Michael Brown 2008-08-20 02:02:51 +01:00
parent 0c7618771e
commit f6f6f626f7
1 changed files with 17 additions and 3 deletions
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20
src/interface/pxe/pxe_undi.c
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@ -221,7 +221,7 @@ PXENV_EXIT_t pxenv_undi_transmit ( struct s_PXENV_UNDI_TRANSMIT
undi_transmit->Status = PXENV_STATUS_UNDI_INVALID_PARAMETER;
return PXENV_EXIT_FAILURE;
}
DBG ( " %s", ( net_protocol ? net_protocol->name : "UNKNOWN" ) );
DBG ( " %s", ( net_protocol ? net_protocol->name : "RAW" ) );
/* Calculate total packet length */
copy_from_real ( &tbd, undi_transmit->TBD.segment,
@ -264,6 +264,7 @@ PXENV_EXIT_t pxenv_undi_transmit ( struct s_PXENV_UNDI_TRANSMIT
pxe_netdev->ll_protocol->ll_addr_len );
ll_dest = destaddr;
} else {
DBG ( " BCAST" );
ll_dest = pxe_netdev->ll_protocol->ll_broadcast;
}
rc = net_tx ( iobuf, pxe_netdev, net_protocol, ll_dest );
@ -559,13 +560,25 @@ PXENV_EXIT_t pxenv_undi_isr ( struct s_PXENV_UNDI_ISR *undi_isr ) {
undi_isr->FuncFlag = PXENV_UNDI_ISR_OUT_OURS;
break;
case PXENV_UNDI_ISR_IN_PROCESS :
DBG ( " PROCESS" );
/* Fall through */
case PXENV_UNDI_ISR_IN_GET_NEXT :
DBG ( " PROCESS/GET_NEXT" );
DBG ( " GET_NEXT" );
/* Some dumb NBPs (e.g. emBoot's winBoot/i) never call
* PXENV_UNDI_ISR with FuncFlag=PXENV_UNDI_ISR_START;
* they just sit in a tight polling loop merrily
* violating the PXE spec with repeated calls to
* PXENV_UNDI_ISR_IN_PROCESS. Force extra polls to
* cope with these out-of-spec clients.
*/
netdev_poll ( pxe_netdev );
/* If we have not yet marked a TX as complete, and the
* netdev TX queue is empty, report the TX completion.
*/
if ( undi_tx_count && list_empty ( &pxe_netdev->tx_queue ) ) {
DBG ( " TXC" );
undi_tx_count--;
undi_isr->FuncFlag = PXENV_UNDI_ISR_OUT_TRANSMIT;
break;
@ -574,6 +587,7 @@ PXENV_EXIT_t pxenv_undi_isr ( struct s_PXENV_UNDI_ISR *undi_isr ) {
/* Remove first packet from netdev RX queue */
iobuf = netdev_rx_dequeue ( pxe_netdev );
if ( ! iobuf ) {
DBG ( " DONE" );
/* No more packets remaining */
undi_isr->FuncFlag = PXENV_UNDI_ISR_OUT_DONE;
/* Re-enable interrupts */
@ -583,7 +597,7 @@ PXENV_EXIT_t pxenv_undi_isr ( struct s_PXENV_UNDI_ISR *undi_isr ) {
/* Copy packet to base memory buffer */
len = iob_len ( iobuf );
DBG ( " RECEIVE %zd", len );
DBG ( " RX %zd", len );
if ( len > sizeof ( basemem_packet ) ) {
/* Should never happen */
len = sizeof ( basemem_packet );