October 2017
Intermediate to advanced
586 pages
14h 8m
English
Content preview from Linux Device Drivers Development
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Packet reception
When a packet arrives at the network interface card, the driver must build a new socket buffer around it and copy the packet into the sk_buff->data field. The kind of copy does not really matter, and DMA can be used too. The driver is generally aware of new data arriving by means of interrupts. When the NIC receives a packet, it raises an interrupt, which will be handled by the driver, which has to check the interrupt status register of the device and check the real reason why the interrupt was raised (it could be RX ok, RX error, and so on). Bit(s) that correspond to the event that raised the interrupt will be set in the status register.
The tricky part will be allocating and building the socket buffer. But, fortunately, ...
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