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007a5ffadc
`McstFramesRcvdOk` counts the number of received multicast packets, and
it reports the value correctly.
However, reading `McstFramesRcvdOk` clears the register to zero. As a
result, the driver was reporting only the packets since the last read,
instead of the accumulated total.
Fix this by updating the multicast statistics accumulatively instaed of
instantaneously.
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Tested-on: D-Link DGE-550T Rev-A3
Signed-off-by: Yeounsu Moon <yyyynoom@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20250823182927.6063-3-yyyynoom@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>