tree 41dbb02482ae9a5ce16d10eb4fcb650f568cefff
parent c56d91ce38d54c0c0dd8d0e4c6a9e0cfa557152f
author Sunil Goutham <sgoutham@cavium.com> 1493730416 +0530
committer David S. Miller <davem@davemloft.net> 1493754082 -0400

net: thunderx: Add support for XDP_TX

Adds support for XDP_TX i.e transmits packet out of
the XDP TX queue mapped to the corresponding Rx queue
on which packet is received.

Since SQ for XDP TX will be used only on a single cpu i.e
SQ description creation and freeing, using atomic free count
is not necessary and will become a bottleneck. Hence added
a separate 'xdp_free_cnt' used for SQs designated for XDP
to track descriptor free count.

Changes also include
- A new entry 'xdp_page' is added to save transmitted packet's
  page pointer for later cleanup.
- XDP Tx SQ's doorbell is ringed once per NAPI instance.
- Retrieving designated SQ for packets being sent out by stack
  via 'nicvf_xmit'.

Signed-off-by: Sunil Goutham <sgoutham@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>