net: xilinx: axienet: Fix IRQ coalescing packet count overflow

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[ Upstream commit c17ff476f5 ]

If coalesce_count is greater than 255 it will not fit in the register and
will overflow. This can be reproduced by running

    # ethtool -C ethX rx-frames 256

which will result in a timeout of 0us instead. Fix this by checking for
invalid values and reporting an error.

Fixes: 8a3b7a252d ("drivers/net/ethernet/xilinx: added Xilinx AXI Ethernet driver")
Signed-off-by: Sean Anderson <sean.anderson@linux.dev>
Reviewed-by: Shannon Nelson <shannon.nelson@amd.com>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
Link: https://patch.msgid.link/20250113163001.2335235-1-sean.anderson@linux.dev
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Sean Anderson 2025-01-13 11:30:00 -05:00 • committed by Greg Kroah-Hartman

parent 4fc02808eb

commit 17b6788589

1 changed files with 6 additions and 0 deletions

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drivers/net/ethernet/xilinx/xilinx_axienet_main.c

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