/
rx_hash.rs
231 lines (204 loc) · 9.06 KB
/
rx_hash.rs
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use itertools::*;
use shakeflow::*;
use shakeflow_std::axis::*;
use shakeflow_std::{FsmExt, UniChannel, Valid, ValidExt};
#[derive(Debug, Interface)]
pub struct I<const DATA_WIDTH: usize, const KEEP_WIDTH: usize> {
s_axis: UniChannel<AxisValid<AxisValue<Keep<U<DATA_WIDTH>, U<KEEP_WIDTH>>>>>,
hash_key: UniChannel<Bits<U<{ 40 * 8 }>>>,
}
pub type O = UniChannel<Valid<Output>>;
// const CYCLE_COUNT: usize = (38 + KEEP_WIDTH - 1) / KEEP_WIDTH;
// TODO: Parametrize
const PTR_WIDTH: usize = 1;
/// Packet's protocol.
#[derive(Debug, Clone, Signal)]
struct Protocol {
ipv4: bool,
tcp: bool,
udp: bool,
typ: Bits<U<4>>,
}
/// Hash result.
#[derive(Debug, Clone, Signal)]
struct HashIpv4 {
hash_ip: Bits<U<32>>,
hash_port: Bits<U<32>>,
}
/// State for inner Fsm component.
#[derive(Debug, Clone, Signal)]
struct State {
active: bool,
ptr: Bits<U<PTR_WIDTH>>,
eth_type: Bits<U<16>>,
ihl: Bits<U<4>>,
data: Bits<U<{ 36 * 8 }>>,
#[member(name = "")]
protocol: Protocol,
}
/// Output of the module.
#[derive(Debug, Clone, Signal)]
pub struct Output {
#[member(name = "")]
hash: Bits<U<32>>,
#[member(name = "type")]
typ: Bits<U<4>>,
}
/// Computes toeplitz hash.
fn hash_toep<'id>(
data: Expr<'id, Bits<U<{ 36 * 8 }>>>, len: usize, key: Expr<'id, Bits<U<{ 40 * 8 }>>>,
) -> Expr<'id, Bits<U<32>>> {
iproduct!(0..len, 0..8).fold(0.into(), |hash_toep, (i, j)| {
hash_toep ^ data[i * 8 + (7 - j)].cond(key.clip_const::<U<32>>(40 * 8 - 32 - i * 8 - j), 0.into())
})
}
pub fn m<const DATA_WIDTH: usize, const KEEP_WIDTH: usize>(module_name: &str) -> Module<I<DATA_WIDTH, KEEP_WIDTH>, O> {
composite::<I<DATA_WIDTH, KEEP_WIDTH>, _, _>(module_name, None, Some("m_axis_hash"), |value, k| {
value
.s_axis
.zip(k, value.hash_key)
// Deserializes packet and computes hash.
.fsm_map::<State, Valid<(HashIpv4, Protocol)>, _>(
k,
None,
StateProj {
active: true.into(),
ptr: [false; PTR_WIDTH].into(),
eth_type: Expr::x(),
ihl: Expr::x(),
data: Expr::x(),
protocol: Expr::x(),
}
.into(),
|input, state| {
let (axis_fwd, hash_key) = *input;
let data = axis_fwd.inner;
let tvalid = axis_fwd.tvalid;
let payload = data.payload;
let tdata = payload.tdata;
let tlast = data.tlast;
let active = state.active;
let ptr = state.ptr;
let eth_type = state.eth_type;
let ihl = state.ihl;
let data = state.data.chunk::<U<8>>();
let protocol = state.protocol;
let is_active = tvalid & active;
// Resets protocol if ptr is zero
let is_protocol_rst = is_active & ptr.is_eq(0.into());
let ipv4 = protocol.ipv4 & !is_protocol_rst;
let tcp = protocol.tcp & !is_protocol_rst;
let udp = protocol.udp & !is_protocol_rst;
// Captures ethernet type
let eth_type = (is_active & ptr.is_eq((13 / KEEP_WIDTH).into()))
.cond(tdata.clip_const::<U<8>>((13 % KEEP_WIDTH) * 8), eth_type.clip_const::<U<8>>(0))
.append(
(is_active & ptr.is_eq((12 / KEEP_WIDTH).into()))
.cond(tdata.clip_const::<U<8>>((12 % KEEP_WIDTH) * 8), eth_type.clip_const::<U<8>>(8)),
)
.resize();
// Checks the packet is IPv4
let ipv4 = ipv4
| ((is_active & ptr.is_eq((13 / KEEP_WIDTH).into())) & eth_type.is_eq(0x800.into()));
// Updates type, valid, active
let typ = is_active.cond(
ptr.is_eq((13 / KEEP_WIDTH).into()).cond(
eth_type
.is_eq(0x800.into())
.cond(protocol.typ, [false; 4].into()),
protocol.typ,
),
protocol.typ,
);
let valid = is_active & ptr.is_eq((13 / KEEP_WIDTH).into()) & !eth_type.is_eq(0x800.into());
let active = active & !valid;
// Captures IHL
let ihl = (is_active & ptr.is_eq((14 / KEEP_WIDTH).into()))
.cond(tdata.clip_const::<U<4>>((14 % KEEP_WIDTH) * 8), ihl);
let is_ipv4 = is_active & ipv4;
// Captures protocol
let tcp = tcp
| (is_ipv4
& ptr.is_eq((23 / KEEP_WIDTH).into())
& tdata.clip_const::<U<8>>((23 % KEEP_WIDTH) * 8).is_eq(0x6.into())
& ihl.is_eq(5.into()));
let udp = udp
| (is_ipv4
& ptr.is_eq((23 / KEEP_WIDTH).into())
& tdata.clip_const::<U<8>>((23 % KEEP_WIDTH) * 8).is_eq(0x11.into())
& ihl.is_eq(5.into()));
// Captures source IP and dest IP
let data = (26..=33)
.fold(data, |data, i| {
if_then_set! { data, is_ipv4 & ptr.is_eq((i / KEEP_WIDTH).into()), Expr::from(i - 26), tdata.clip_const::<U<8>>((i % KEEP_WIDTH) * 8) }
});
let is_port_avail = is_ipv4 & (tcp | udp);
// Updates type, valid and active
let typ = (is_ipv4 & ptr.is_eq((33 / KEEP_WIDTH).into()) & !is_port_avail)
.cond([true, false, false, false].into(), typ);
let valid =
valid | (is_ipv4 & ptr.is_eq((33 / KEEP_WIDTH).into()) & !is_port_avail);
let active = active & !(is_ipv4 & ptr.is_eq((33 / KEEP_WIDTH).into()) & !is_port_avail);
// Captures source port and dest port
let data = (34..=37)
.fold(data, |data, i| {
if_then_set! { data, is_port_avail & ptr.is_eq((i / KEEP_WIDTH).into()), Expr::from(i - 26), tdata.clip_const::<U<8>>((i % KEEP_WIDTH) * 8) }
})
.repr();
let typ = (is_port_avail & ptr.is_eq((37 / KEEP_WIDTH).into())).cond(
Expr::from([true, false])
.append(tcp.into())
.append(udp.into())
.resize(),
typ,
);
let valid = valid | (is_port_avail & ptr.is_eq((37 / KEEP_WIDTH).into()));
let active = active & !(is_port_avail & ptr.is_eq((37 / KEEP_WIDTH).into()));
// Updates type and valid
let is_active_last = tvalid & tlast & active;
let typ = is_active_last.cond([false; 4].into(), typ);
let valid = valid | is_active_last;
// Updates ptr and active
let ptr = (tvalid & tlast).cond(
0.into(),
is_active.cond((ptr + 1.into()).resize::<U<PTR_WIDTH>>(), ptr),
);
let active = active | (tvalid & tlast);
// Calculates hash results
let hash_ip = hash_toep(data, 8, hash_key);
let hash_port = hash_toep(data >> 64_usize, 4, hash_key.resize() << 64_usize);
let protocol = ProtocolProj { ipv4, tcp, udp, typ }.into();
(
Expr::<Valid<_>>::new(
valid,
(HashIpv4Proj { hash_ip, hash_port }.into(), protocol).into(),
),
StateProj {
active,
ptr,
eth_type,
ihl,
data,
protocol,
}
.into(),
)
},
)
.buffer(k, Expr::invalid())
// Post-processing
.map_inner(k, |inner| {
let (hash, protocol) = *inner;
OutputProj {
hash: (!protocol.ipv4).cond(
[false; 32].into(),
(protocol.tcp | protocol.udp).cond(hash.hash_ip ^ hash.hash_port, hash.hash_ip),
),
typ: protocol.typ,
}
.into()
})
.buffer(k, Expr::invalid())
})
.build()
}