driver: rx: skb alloc vs metadata fetch from fifo
If the allocation fails, store the read word into driver's data. On next try, use the stored word instead of reading it again. Do not discard the partial frame.
This is a better solution to implementing RX FIFO peek register in HW, suggested by Mr. Pisa. I thought that we had an issue for the PEEK register, but I didn't find it.
To be implemented after the PCI driver is merged, which will probably be after I finish writing the thesis.