net: thunderx: Fix for Qset error due to CQ full

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[ Upstream commit 4c0b6eaf37 ]

On Thunderx pass 1.x and pass2 due to a HW errata default CQ
DROP_LEVEL of 0x80 is not sufficient to avoid CQ_WR_FULL Qset
error when packets are being received at >20Mpps resulting in
complete stall of packet reception.

This patch will configure it to 0x100 which is what is expected
by HW on Thunderx. On future passes of thunderx and other chips
HW default/reset value will be 0x100 or higher hence not overwritten.

Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
Signed-off-by: Sunil Goutham <sgoutham@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Sunil Goutham 2016-02-24 16:40:50 +05:30 • committed by Greg Kroah-Hartman

parent 724457fa1c

commit e7c3692b80

3 changed files with 16 additions and 1 deletions

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9

drivers/net/ethernet/cavium/thunder/nic.h

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6

drivers/net/ethernet/cavium/thunder/nic_main.c

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2

drivers/net/ethernet/cavium/thunder/nic_reg.h

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