net/mlx5e: Fix fixpoint divide exception in mlx5e_am_stats_compare

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[ Upstream commit e58edaa486 ]

Helmut reported a bug about division by zero while
running traffic and doing physical cable pull test.

When the cable unplugged the ppms become zero, so when
dividing the current ppms by the previous ppms in the
next dim iteration there is division by zero.

This patch prevent this division for both ppms and epms.

Fixes: c3164d2fc4 ("net/mlx5e: Added BW check for DIM decision mechanism")
Reported-by: Helmut Grauer <helmut.grauer@de.ibm.com>
Signed-off-by: Talat Batheesh <talatb@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Talat Batheesh 2018-01-21 05:30:42 +02:00 • committed by Greg Kroah-Hartman

parent 3eae0ba8c9

commit 4f97adffa3

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drivers/net/ethernet/mellanox/mlx5/core/en_rx_am.c

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