Hi!

Can we get the following backported to the 4.9 branch?

commit 9383b33771e566fa547daa2d09c6e0f1aaa298c3 Author: Jakub Kicinski jakub.kicinski@netronome.com Date: Thu Mar 2 15:26:20 2017 -0800

nfp: don't tell FW about the reserved buffer space

Since commit c0f031bc8866 ("nfp_net: use alloc_frag() and build_skb()") we are allocating buffers which have to hold both the data and skb to be created in place by build_skb().

FW should only be told about the buffer space it can DMA to, that is without the build_skb() headroom and tailroom. Note: firmware applications should validate the buffers against both MTU and free list buffer size so oversized packets would not pass through the NIC anyway.

Fixes: c0f031bc8866 ("nfp: use alloc_frag() and build_skb()") Signed-off-by: Jakub Kicinski jakub.kicinski@netronome.com Signed-off-by: David S. Miller davem@davemloft.net

Thank you!