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

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[ Upstream commit c17ff476f53afb30f90bb3c2af77de069c81a622 ]

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>
This commit is contained in:
Sean Anderson
2025-01-13 11:30:00 -05:00
committed by Greg Kroah-Hartman
parent c385389ab0
commit 207c81e2ec
1 changed files with 6 additions and 0 deletions
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6
drivers/net/ethernet/xilinx/xilinx_axienet_main.c
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@@ -1570,6 +1570,12 @@ axienet_ethtools_set_coalesce(struct net_device *ndev,
return -EFAULT;
}
if (ecoalesce->rx_max_coalesced_frames > 255 ||
ecoalesce->tx_max_coalesced_frames > 255) {
NL_SET_ERR_MSG(extack, "frames must be less than 256");
return -EINVAL;
}
if (ecoalesce->rx_max_coalesced_frames)
lp->coalesce_count_rx = ecoalesce->rx_max_coalesced_frames;
if (ecoalesce->rx_coalesce_usecs)