I'm receiving a packet of unknown length and it is less than 1024 bytes.
I'm using TcpIoReceive. I'm expecting it to receive the packet and then
update the NET_FRAGMENT.Len to the number of bytes received. Instead, it
times out.
I know the packet is being sent (I can see it on wireshark). Also, if the
actual packet size and my buffer size match, then everything works fine. It
only times out when the actual packet size is smaller than my buffer.
Here is example code. What am I doing wrong?
EFI_STATUS
ExampleReceive (
IN EXAMPLE_PRIVATE *Private,
IN OUT UINT32 *DataSize,
IN OUT UINT8 *Data
)
{
EFI_STATUS Status;
NET_FRAGMENT Fragment;
NET_BUF *Packet;
Fragment.Len = *DataSize;
Fragment.Bulk = Data;
Packet = NetbufFromExt (
&Fragment,
1,
0,
0,
ExampleNbufExtFree,
NULL
);
if (Packet == NULL) {
return EFI_OUT_OF_RESOURCES;
}
Status = gBS->SetTimer (
Private->RxTimeoutEvent,
TimerRelative,
5 * TICKS_PER_SECOND
);
if (EFI_ERROR (Status)) {
NetbufFree (Packet);
return Status;
}
Status = TcpIoReceive (
&Private->TcpIo,
Packet,
FALSE,
Private->RxTimeoutEvent
);
gBS->SetTimer (Private->RxTimeoutEvent, TimerCancel, 0);
NetbufFree (Packet);
if (!EFI_ERROR (Status)) {
*DataSize = Fragment.Len;
}
return Status;
}
If the incoming packet is 1024 bytes, then the following code will work as
expected. If the incoming packet is less than 1024 bytes, then it will
return EFI_TIMEOUT after 5 seconds.
DataSize = 1024; // this number is arbitrary
Data = AllocatePool (DataSize);
ExampleReceive (Private, &DataSize, Data);
If I'm doing something wrong, then how would I receive a packet where I
know the maximum size, but I don't know the exact size? I'm using
UDK2010.SR1.UP1.P1. Thank you for any insight.
Thomas Rognon
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