net: gianfar: Implement rx_missed_errors counter

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Devices with RMON support has a 16-bit RDRP counter.  It provides: "Receive
dropped packets counter. Increments for frames received which are streamed
to system but are later dropped due to lack of system resources."

To handle more than 2^16 dropped packets, a carry bit in CAR1 register is
set on overflow, so we enable irq when this is set, extending the counter
to 2^64 for handling situations where lots of packets are missed (e.g.
during heavy network storms).

Signed-off-by: Esben Haabendal <esben@geanix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Esben Haabendal 2021-06-17 11:49:28 +02:00 • committed by David S. Miller

parent 8da32a1071

commit 14870b75fe

2 changed files with 57 additions and 3 deletions

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50

drivers/net/ethernet/freescale/gianfar.c

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10

drivers/net/ethernet/freescale/gianfar.h

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