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| author | Eric Nelson <eric@nelint.com> | 2016-09-24 07:42:19 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-09-27 07:39:34 -0400 |
| commit | 3ac72b7b63d57b231dda1e8f8d13872e0d7e8603 (patch) | |
| tree | daf1ca189ea3eb820b243e1752a6be19bdbdfbfb /drivers/net/ethernet/freescale/fec_mpc52xx.c | |
| parent | 97dc499c1ae396bc0d529f5b1aef3138de1ae7de (diff) | |
| download | linux-3ac72b7b63d57b231dda1e8f8d13872e0d7e8603.tar.gz | |
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>
Diffstat (limited to 'drivers/net/ethernet/freescale/fec_mpc52xx.c')
0 files changed, 0 insertions, 0 deletions