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Kernel: Pad packets out to 64 bytes in rtl8139 driver

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This commit is contained in:
Conrad Pankoff 2019-09-03 23:16:24 +10:00 • committed by Andreas Kling
parent c8fa95b8cd
commit a3468dc993
1 changed files with 11 additions and 0 deletions
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11
Kernel/Net/RTL8139NetworkAdapter.cpp
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@ -302,6 +302,17 @@ void RTL8139NetworkAdapter::send_raw(const u8* data, int length)
memcpy((void*)(m_tx_buffer_addr[hw_buffer]), data, length);
memset((void*)(m_tx_buffer_addr[hw_buffer] + length), 0, TX_BUFFER_SIZE - length);
// the rtl8139 will not actually emit packets onto the network if they're
// smaller than 64 bytes. the rtl8139 adds a checksum to the end of each
// packet, and that checksum is four bytes long, so we pad the packet to
// 60 bytes if necessary to make sure the whole thing is large enough.
if (length < 60) {
#ifdef RTL8139_DEBUG
kprintf("RTL8139NetworkAdapter: adjusting payload size from %d to 60\n", length);
#endif
length = 60;
}
out32(REG_TXSTATUS0 + (hw_buffer * 4), length);
}