From: Neil Horman <redacted>
Date: Wed, 3 Jan 2018 10:13:33 -0500

Thats exactly what this patch does, instead of creating a second loop to
traverse all the emptied ring buffers, now I:

1) Pre-allocate a new skb when I know I'm going to receive the in-place skb
2) Map the skb into the appropriate dma device domain
3) If (1) and (2) succede, then I swap the newly allocate skb and dma address
with the old one and recieve the old into the network stack
4) If (1) or (2) fail, then I goto clear_complete, which leaves the old skb and
dma address in place, sets the buffer status back to 0 (indicating completion),
and write the new ring status back to the hardware

This is what you wanted, a pre-allocate and swap-if-successful, recycle-if-not
approach, rather than the leave-a-hole-in-the-ring approach that is there
currently, no?  Or did I miss something else?

I misread the code sorry, you're absolutely right.

I'll apply this patch, thanks Neil. :)