[0/3,net-next] net: netsec: Add XDP Support

Message ID 1561718355-13919-1-git-send-email-ilias.apalodimas@linaro.org
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  • net: netsec: Add XDP Support
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Ilias Apalodimas June 28, 2019, 10:39 a.m.
This is a respin of https://www.spinics.net/lists/netdev/msg526066.html
Since page_pool API fixes are merged into net-next we can now safely use 
it's DMA mapping capabilities. 

First patch changes the buffer allocation from napi/netdev_alloc_frag()
to page_pool API. Although this will lead to slightly reduced performance 
(on raw packet drops only) we can use the API for XDP buffer recycling. 
Another side effect is a slight increase in memory usage, due to using a 
single page per packet.

The second patch adds XDP support on the driver. 
There's a bunch of interesting options that come up due to the single 
Tx queue.
Locking is needed(to avoid messing up the Tx queues since ndo_xdp_xmit 
and the normal stack can co-exist). We also need to track down the 
'buffer type' for TX and properly free or recycle the packet depending 
on it's nature.

Changes since RFC:
- Bug fixes from Jesper and Maciej
- Added page pool API to retrieve the DMA direction

Ilias Apalodimas (3):
  net: netsec: Use page_pool API
  net: page_pool: add helper function for retrieving dma direction
  net: netsec: add XDP support

 drivers/net/ethernet/socionext/Kconfig  |   1 +
 drivers/net/ethernet/socionext/netsec.c | 469 ++++++++++++++++++++----
 include/net/page_pool.h                 |   9 +
 3 files changed, 412 insertions(+), 67 deletions(-)