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[pxe] Fix interoperability with the 3Com DOS UNDI driver
The 3Com DOS UNDI driver fails when run on top of gPXE for two reasons: firstly because PXENV_UNDI_SET_PACKET_FILTER is unsupported, and secondly because gPXE enters the NBP without enabling interrupts on the NIC, and the 3Com driver never calls PXENV_UNDI_OPEN. Fix by always returning success from PXENV_UNDI_SET_PACKET_FILTER (which is no worse than the current situation, since we already ignore the receive packet filter in PXENV_UNDI_OPEN), and by forcibly enabling interrupts on the NIC within PXENV_UNDI_TRANSMIT. The latter is something of a hack, but avoids the need to implement a complete base-code ISR that we would otherwise need if we were to enter the NBP with interrupts enabled.
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@ -211,6 +211,12 @@ PXENV_EXIT_t pxenv_undi_transmit ( struct s_PXENV_UNDI_TRANSMIT
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DBG ( "PXENV_UNDI_TRANSMIT" );
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/* Forcibly enable interrupts at this point, to work around
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* callers that never call PXENV_UNDI_OPEN before attempting
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* to use the UNDI API.
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*/
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netdev_irq ( pxe_netdev, 1 );
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/* Identify network-layer protocol */
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switch ( undi_transmit->Protocol ) {
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case P_IP: net_protocol = &ipv4_protocol; break;
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@ -341,10 +347,17 @@ pxenv_undi_set_station_address ( struct s_PXENV_UNDI_SET_STATION_ADDRESS
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PXENV_EXIT_t
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pxenv_undi_set_packet_filter ( struct s_PXENV_UNDI_SET_PACKET_FILTER
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*undi_set_packet_filter ) {
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DBG ( "PXENV_UNDI_SET_PACKET_FILTER" );
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undi_set_packet_filter->Status = PXENV_STATUS_UNSUPPORTED;
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return PXENV_EXIT_FAILURE;
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/* Pretend that we succeeded, otherwise the 3Com DOS UNDI
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* driver refuses to load. (We ignore the filter value in the
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* PXENV_UNDI_OPEN call anyway.)
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*/
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DBG ( " %02x", undi_set_packet_filter->filter );
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undi_set_packet_filter->Status = PXENV_STATUS_SUCCESS;
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return PXENV_EXIT_SUCCESS;
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}
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/* PXENV_UNDI_GET_INFORMATION
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