Commit fec3b9ec authored Jul 01, 2019 by David S. Miller

Merge branch 'net-netsec-Add-XDP-Support'

Ilias Apalodimas says:

====================
net: netsec: Add XDP Support

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
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

parents a8488b70 ba2b2321

drivers/net/ethernet/socionext/Kconfig

+1 −0

Original line number	Diff line number	Diff line
		@@ -26,6 +26,7 @@ config SNI_NETSEC
		tristate "Socionext NETSEC ethernet support"
		depends on (ARCH_SYNQUACER \|\| COMPILE_TEST) && OF
		select PHYLIB
		select PAGE_POOL
		select MII
		---help---
		Enable to add support for the SocioNext NetSec Gigabit Ethernet

drivers/net/ethernet/socionext/netsec.c

+406 −67

File changed.

Preview size limit exceeded, changes collapsed.

include/net/page_pool.h

+9 −0

Original line number	Diff line number	Diff line
		@@ -112,6 +112,15 @@ static inline struct page page_pool_dev_alloc_pages(struct page_pool pool)
		return page_pool_alloc_pages(pool, gfp);
		}

		/* get the stored dma direction. A driver might decide to treat this locally and
		* avoid the extra cache line from page_pool to determine the direction
		*/
		static
		inline enum dma_data_direction page_pool_get_dma_dir(struct page_pool *pool)
		{
		return pool->p.dma_dir;
		}

		struct page_pool page_pool_create(const struct page_pool_params params);

		void __page_pool_free(struct page_pool *pool);