Trilight Zone

[thedark]

Linked to dev->hard_start_xmit() and is called by the kernel when there is some data that the kernel wants to put out over the device. This puts the data onto the card and triggers the transmit. You need to know how to bundle the data and how to get it onto the card (shared memory copy, PIO transfer, DMA?) and in the right place on the card. Then you need to know how to tell the card to send the data down the wire, and (possibly) post an interrupt when done. When the hardware can't accept additional packets it should set the dev->tbusy flag. When additional room is available, usually during a transmit-complete interrupt, dev->tbusy should be cleared and the higher levels informed with mark_bh(INET_BH).