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//! Enhanced receive buffer descriptor layout and fields.
use ral_registers::{RORegister, RWRegister};
#[repr(C)]
pub struct RxBD {
pub data_length: RORegister<u16>,
pub flags: RWRegister<u16>,
pub data_buffer_pointer: RWRegister<u32>,
pub status: RWRegister<u16>,
pub control: RWRegister<u16>,
pub checksum: RORegister<u16>,
pub header: RORegister<u16>,
_reserved0: [u16; 1],
pub last_bdu: RWRegister<u16>,
pub timestamp_1588: RORegister<u32>,
_reserved1: [u16; 4],
}
bdfields!(flags, u16,
empty [ offset = 15, bits = 1, ],
ro1 [ offset = 14, bits = 1, ],
wrap [ offset = 13, bits = 1, ],
ro2 [ offset = 12, bits = 1, ],
last [ offset = 11, bits = 1, ],
miss [ offset = 8, bits = 1, ],
broadcast [ offset = 7, bits = 1, ],
multicast [ offset = 6, bits = 1, ],
length_violation [ offset = 5, bits = 1, ],
non_octet_violation [ offset = 4, bits = 1, ],
crc_error [ offset = 2, bits = 1, ],
overrun [ offset = 1, bits = 1, ],
truncated [ offset = 0, bits = 1, ],
);
bdfields!(status, u16,
vlan_priority [ offset = 13, bits = 3, ],
ip_checksum_error [ offset = 5, bits = 1, ],
protocol_checksum_error [ offset = 4, bits = 1, ],
vlan [ offset = 2, bits = 1, ],
ipv6 [ offset = 1, bits = 1, ],
frag [ offset = 0, bits = 1, ],
);
bdfields!(control, u16,
mac_error [ offset = 15, bits = 1, ],
phy_error [ offset = 10, bits = 1, ],
collision [ offset = 9, bits = 1, ],
unicast [ offset = 8, bits = 1, ],
interrupt [ offset = 7, bits = 1, ],
);
bdfields!(header, u16,
length [ offset = 11, bits = 5, ],
protocol [ offset = 0, bits = 8, ],
);
bdfields!(last_bdu, u16,
last_bdu [ offset = 15, bits = 1, ],
);
#[cfg(test)]
mod tests {
use core::ptr::addr_of;
use super::RxBD;
fn zeroed() -> RxBD {
// Safety: zero bitpattern is fine for primitive fields.
unsafe { core::mem::MaybeUninit::zeroed().assume_init() }
}
#[test]
fn field_offsets() {
let rxbd = zeroed();
let start = &rxbd as *const _ as *const u8;
assert_eq!(unsafe { start.add(0x0) }, addr_of!(rxbd.data_length).cast());
assert_eq!(unsafe { start.add(0x2) }, addr_of!(rxbd.flags).cast());
assert_eq!(
unsafe { start.add(0x4) },
addr_of!(rxbd.data_buffer_pointer).cast()
);
assert_eq!(unsafe { start.add(0x8) }, addr_of!(rxbd.status).cast());
assert_eq!(unsafe { start.add(0xA) }, addr_of!(rxbd.control).cast());
assert_eq!(unsafe { start.add(0xC) }, addr_of!(rxbd.checksum).cast());
assert_eq!(unsafe { start.add(0xE) }, addr_of!(rxbd.header).cast());
assert_eq!(unsafe { start.add(0x12) }, addr_of!(rxbd.last_bdu).cast());
assert_eq!(
unsafe { start.add(0x14) },
addr_of!(rxbd.timestamp_1588).cast()
);
}
}
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