Constant intel_ethernet::descriptors::TX_PAYLEN_SHIFT

pub const TX_PAYLEN_SHIFT: u8 = _; // 14u8

Tx Descriptor paylen shift The paylen is located at bit 46 in the upper 64 bits of the advanced Tx descriptor. Since we have divided the upper 64 bits into 4 parts (u16,u8,u8,u32), the paylen is then located at bit 14 of the upper 32 bits of the descriptor.