gianfar: fix a flooded alignment reports because of padding issue.
[ Upstream commit
58117672943734715bbe7565ac9f062effa524f0 ]
According to LS1021A RM, the value of PAL can be set so that the start of the
IP header in the receive data buffer is aligned to a 32-bit boundary. Normally,
setting PAL = 2 provides minimal padding to ensure such alignment of the IP
header.
However every incoming packet's 8-byte time stamp will be inserted into the
packet data buffer as padding alignment bytes when hardware time stamping is
enabled.
So we set the padding 8+2 here to avoid the flooded alignment faults:
root@128:~# cat /proc/cpu/alignment
User: 0
System: 17539 (inet_gro_receive+0x114/0x2c0)
Skipped: 0
Half: 0
Word: 0
DWord: 0
Multi: 17539
User faults: 2 (fixup)
Also shown when exception report enablement
CPU: 0 PID: 161 Comm: irq/66-eth1_g0_ Not tainted 4.1.21-rt13-WR8.0.0.0_preempt-rt #16
Hardware name: Freescale LS1021A
[<
8001b420>] (unwind_backtrace) from [<
8001476c>] (show_stack+0x20/0x24)
[<
8001476c>] (show_stack) from [<
807cfb48>] (dump_stack+0x94/0xac)
[<
807cfb48>] (dump_stack) from [<
80025d70>] (do_alignment+0x720/0x958)
[<
80025d70>] (do_alignment) from [<
80009224>] (do_DataAbort+0x40/0xbc)
[<
80009224>] (do_DataAbort) from [<
80015398>] (__dabt_svc+0x38/0x60)
Exception stack(0x86ad1cc0 to 0x86ad1d08)
1cc0:
f9b3e080 86b3d072 2d78d287 00000000 866816c0 86b3d05e 86e785d0 00000000
1ce0:
00000011 0000000e 80840ab0 86ad1d3c 86ad1d08 86ad1d08 806d7fc0 806d806c
1d00:
40070013 ffffffff
[<
80015398>] (__dabt_svc) from [<
806d806c>] (inet_gro_receive+0x114/0x2c0)
[<
806d806c>] (inet_gro_receive) from [<
80660eec>] (dev_gro_receive+0x21c/0x3c0)
[<
80660eec>] (dev_gro_receive) from [<
8066133c>] (napi_gro_receive+0x44/0x17c)
[<
8066133c>] (napi_gro_receive) from [<
804f0538>] (gfar_clean_rx_ring+0x39c/0x7d4)
[<
804f0538>] (gfar_clean_rx_ring) from [<
804f0bf4>] (gfar_poll_rx_sq+0x58/0xe0)
[<
804f0bf4>] (gfar_poll_rx_sq) from [<
80660b10>] (net_rx_action+0x27c/0x43c)
[<
80660b10>] (net_rx_action) from [<
80033638>] (do_current_softirqs+0x1e0/0x3dc)
[<
80033638>] (do_current_softirqs) from [<
800338c4>] (__local_bh_enable+0x90/0xa8)
[<
800338c4>] (__local_bh_enable) from [<
8008025c>] (irq_forced_thread_fn+0x70/0x84)
[<
8008025c>] (irq_forced_thread_fn) from [<
800805e8>] (irq_thread+0x16c/0x244)
[<
800805e8>] (irq_thread) from [<
8004e490>] (kthread+0xe8/0x104)
[<
8004e490>] (kthread) from [<
8000fda8>] (ret_from_fork+0x14/0x2c)
Signed-off-by: Zumeng Chen <zumeng.chen@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>