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net/mlx5e: Fix wraparound in rate limiting for values above 255 Gbps

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Add validation to reject rates exceeding 255 Gbps that would overflow
the 8 bits max bandwidth field.

Fixes: d8880795da ("net/mlx5e: Implement DCBNL IEEE max rate")
Signed-off-by: Gal Pressman <gal@nvidia.com>
Reviewed-by: Nimrod Oren <noren@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://patch.msgid.link/1762681073-1084058-5-git-send-email-tariqt@nvidia.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Gal Pressman
2025-11-09 11:37:52 +02:00
committed by Paolo Abeni
parent a7bf4d5063
commit 43b27d1bd8
1 changed files with 9 additions and 1 deletions
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10
drivers/net/ethernet/mellanox/mlx5/core/en_dcbnl.c
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@@ -596,11 +596,13 @@ static int mlx5e_dcbnl_ieee_setmaxrate(struct net_device *netdev,
u8 max_bw_value[IEEE_8021QAZ_MAX_TCS];
u8 max_bw_unit[IEEE_8021QAZ_MAX_TCS];
__u64 upper_limit_mbps;
__u64 upper_limit_gbps;
int i;
memset(max_bw_value, 0, sizeof(max_bw_value));
memset(max_bw_unit, 0, sizeof(max_bw_unit));
upper_limit_mbps = 255 * MLX5E_100MB;
upper_limit_gbps = 255 * MLX5E_1GB;
for (i = 0; i <= mlx5_max_tc(mdev); i++) {
if (!maxrate->tc_maxrate[i]) {
@@ -612,10 +614,16 @@ static int mlx5e_dcbnl_ieee_setmaxrate(struct net_device *netdev,
MLX5E_100MB);
max_bw_value[i] = max_bw_value[i] ? max_bw_value[i] : 1;
max_bw_unit[i] = MLX5_100_MBPS_UNIT;
} else {
} else if (max_bw_value[i] <= upper_limit_gbps) {
max_bw_value[i] = div_u64(maxrate->tc_maxrate[i],
MLX5E_1GB);
max_bw_unit[i] = MLX5_GBPS_UNIT;
} else {
netdev_err(netdev,
"tc_%d maxrate %llu Kbps exceeds limit %llu\n",
i, maxrate->tc_maxrate[i],
upper_limit_gbps);
return -EINVAL;
}
}