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Enable MACsec (Media Access Control Security) support in the Mellanox mlx5 driver by setting CONFIG_MLX5_MACSEC=y. Enabling this configuration allows users to utilize hardware MACsec offload capabilities on supported Mellanox ConnectX network adapters. This provides point-to-point Layer 2 encryption at line rate while significantly reducing CPU overhead. The kmod-macsec dependency is intentionally omitted to make this an opt-in feature. The offload support only builds if kmod-macsec is also selected, preventing driver bloat for standard users. Signed-off-by: Til Kaiser <mail@tk154.de> Link: https://github.com/openwrt/openwrt/pull/25400 Signed-off-by: Robert Marko <robimarko@gmail.com>