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Eric Nelson 3ac72b7b63 net: fec: align IP header in hardware

The FEC receive accelerator (RACC) supports shifting the data payload of
received packets by 16-bits, which aligns the payload (IP header) on a
4-byte boundary, which is, if not required, at least strongly suggested
by the Linux networking layer.

Without this patch, a huge number of alignment faults will be taken by the
IP stack, as seen in /proc/cpu/alignment:

	~/$ cat /proc/cpu/alignment
	User:		0
	System:		72645 (inet_gro_receive+0x104/0x27c)
	Skipped:	0
	Half:		0
	Word:		0
	DWord:		0
	Multi:		72645
	User faults:	3 (fixup+warn)

This patch was suggested by Andrew Lunn in this message to linux-netdev:
	http://marc.info/?l=linux-arm-kernel&m=147465452108384&w=2

and adapted from a patch by Russell King from 2014:
	http://git.arm.linux.org.uk/cgit/linux-arm.git/commit/?id=70d8a8a

Signed-off-by: Eric Nelson <eric@nelint.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2016-09-27 07:39:34 -04:00

fman

remove lots of IS_ERR_VALUE abuses

2016-05-27 15:26:11 -07:00

fs_enet

net: ethernet: fs-enet: use phy_ethtool_{get|set}_link_ksettings

2016-05-16 22:16:32 -04:00

fec_main.c

net: fec: align IP header in hardware

2016-09-27 07:39:34 -04:00

fec_mpc52xx_phy.c

mdio: Move allocation of interrupts into core