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 Changes since v1: - Use page_pool_free correctly if xdp_rxq_info_reg() failed 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 | 473 ++++++++++++++++++++---- include/net/page_pool.h | 9 + 3 files changed, 416 insertions(+), 67 deletions(-) -- 2.20.1
