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core/dhcp: Minor review/cleanup. Remove comment on counter optimization since does not seems to be implemented.

This commit is contained in:
Florent Kermarrec 2023-09-03 19:44:49 +02:00
parent 936b6348e5
commit 28fc02bb30
1 changed files with 38 additions and 43 deletions
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49
liteeth/core/dhcp.py
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@ -76,12 +76,8 @@ class LiteEthDHCPTX(LiteXModule):
# Signals.
# --------
# We build a counter that underflows when it is finished
# This way we can just check the MSB of counter which saves
# a full cmp
padding_len = (8 + DHCP_SERVER_NAME_LENGTH + DHCP_BOOT_FILE_NAME_LENGTH) // 4
count = Signal(max=padding_len)
longest_packet = max(DHCP_FIXED_DISCOVER_LENGTH, DHCP_FIXED_REQUEST_LENGTH) // 4
length = Signal(max=longest_packet)
self.comb += Case(self.type, {
@ -134,28 +130,28 @@ class LiteEthDHCPTX(LiteXModule):
)
fsm.act("CLIENT-IP-ADDRESS",
udp_port.sink.valid.eq(1),
udp_port.sink.data.eq(0x00000000), # Client IP: 0.0.0.0
udp_port.sink.data.eq(0x00000000), # Client IP: 0.0.0.0.
If(udp_port.sink.ready,
NextState("YOUR-IP-ADDRESS")
)
)
fsm.act("YOUR-IP-ADDRESS",
udp_port.sink.valid.eq(1),
udp_port.sink.data.eq(0x00000000), # Your IP: 0.0.0.0
udp_port.sink.data.eq(0x00000000), # Your IP: 0.0.0.0.
If(udp_port.sink.ready,
NextState("SERVER-IP-ADDRESS")
)
)
fsm.act("SERVER-IP-ADDRESS",
udp_port.sink.valid.eq(1),
udp_port.sink.data.eq(0x00000000), # Server IP: 0.0.0.0
udp_port.sink.data.eq(0x00000000), # Server IP: 0.0.0.0.
If(udp_port.sink.ready,
NextState("GATEWAY-IP-ADDRESS")
)
)
fsm.act("GATEWAY-IP-ADDRESS",
udp_port.sink.valid.eq(1),
udp_port.sink.data.eq(0x00000000), # Gateway IP: 0.0.0.0
udp_port.sink.data.eq(0x00000000), # Gateway IP: 0.0.0.0.
If(udp_port.sink.ready,
NextState("CLIENT-MAC-ADDRESS-MSB")
)
@ -181,10 +177,10 @@ class LiteEthDHCPTX(LiteXModule):
NextState("PADDING")
)
)
# Includes
# - Client MAC padding
# - Server name
# - BOOT-FILE-NAME
# Padding, includes:
# - Client MAC padding.
# - Server name (Unused).
# - BOOT-FILE-NAME (Unused).
fsm.act("PADDING",
udp_port.sink.valid.eq(1),
udp_port.sink.data.eq(0x00000000),
@ -206,10 +202,10 @@ class LiteEthDHCPTX(LiteXModule):
)
)
# Options.
# -----------------
# --------
fsm.act("OPTIONS-0",
udp_port.sink.valid.eq(1),
# DHCP Message Type: Discover
# DHCP Message Type: Discover.
udp_port.sink.data[ 0: 8].eq(DHCP_OPTTYP_MESSAGE_TYPE),
udp_port.sink.data[ 8:16].eq(0x01),
If(self.type == DHCP_TX_DISCOVER,
@ -217,7 +213,7 @@ class LiteEthDHCPTX(LiteXModule):
).Elif(self.type == DHCP_TX_REQUEST,
udp_port.sink.data[16:24].eq(DHCP_OPTVAL_MESSAGE_TYPE_REQUEST),
),
# Client Identifier
# Client Identifier.
udp_port.sink.data[24:32].eq(DHCP_OPTTYP_CLIENT_IDENTIFIER),
If(udp_port.sink.ready,
NextState("OPTIONS-1")
@ -225,7 +221,7 @@ class LiteEthDHCPTX(LiteXModule):
)
fsm.act("OPTIONS-1",
udp_port.sink.valid.eq(1),
# Client Identifier
# Client Identifier.
udp_port.sink.data[ 0: 8].eq(0x06),
udp_port.sink.data[ 8:16].eq(self.mac_address[40:48]),
udp_port.sink.data[16:24].eq(self.mac_address[32:40]),
@ -236,11 +232,11 @@ class LiteEthDHCPTX(LiteXModule):
)
fsm.act("OPTIONS-2",
udp_port.sink.valid.eq(1),
# Client Identifier
# Client Identifier.
udp_port.sink.data[ 0: 8].eq(self.mac_address[16:24]),
udp_port.sink.data[ 8:16].eq(self.mac_address[ 8:16]),
udp_port.sink.data[16:24].eq(self.mac_address[ 0: 8]),
# Parameter Request List: Subnet Mask, Router
# Parameter Request List: Subnet Mask, Router.
udp_port.sink.data[24:32].eq(DHCP_OPTTYP_PARAM_REQUEST_LIST),
If(udp_port.sink.ready,
NextState("OPTIONS-3")
@ -248,7 +244,7 @@ class LiteEthDHCPTX(LiteXModule):
)
fsm.act("OPTIONS-3",
udp_port.sink.valid.eq(1),
# Parameter Request List: Subnet Mask, Router
# Parameter Request List: Subnet Mask, Router.
udp_port.sink.data[ 0: 8].eq(0x02),
udp_port.sink.data[ 8:16].eq(DHCP_OPTVAL_PARAM_SUBNET_MASK),
udp_port.sink.data[16:24].eq(DHCP_OPTVAL_PARAM_ROUTER),
@ -262,10 +258,10 @@ class LiteEthDHCPTX(LiteXModule):
If(udp_port.sink.ready, NextState("OPTIONS-4"))
)
)
# These options are only transmitted for DHCP REQUEST
# These options are only transmitted for DHCP REQUEST.
fsm.act("OPTIONS-4",
udp_port.sink.valid.eq(1),
# Requested IP Address
# Requested IP Address.
udp_port.sink.data[ 0: 8].eq(0x04),
udp_port.sink.data[ 8:16].eq(self.offered_ip_address[24:32]),
udp_port.sink.data[16:24].eq(self.offered_ip_address[16:24]),
@ -276,9 +272,9 @@ class LiteEthDHCPTX(LiteXModule):
)
fsm.act("OPTIONS-5",
udp_port.sink.valid.eq(1),
# Requested IP Address
# Requested IP Address.
udp_port.sink.data[ 0: 8].eq(self.offered_ip_address[0:8]),
# Server IP Address
# Server IP Address.
udp_port.sink.data[ 8:16].eq(DHCP_OPTTYP_SRV_IP_ADDRESS),
udp_port.sink.data[16:24].eq(0x04),
udp_port.sink.data[24:32].eq(self.server_ip_address[24:32]),
@ -289,11 +285,11 @@ class LiteEthDHCPTX(LiteXModule):
fsm.act("OPTIONS-6",
udp_port.sink.last.eq(1),
udp_port.sink.valid.eq(1),
# Server IP Address
# Server IP Address.
udp_port.sink.data[ 0: 8].eq(self.server_ip_address[16:24]),
udp_port.sink.data[ 8:16].eq(self.server_ip_address[ 8:16]),
udp_port.sink.data[16:24].eq(self.server_ip_address[ 0: 8]),
# Client Identifier
# Client Identifier.
udp_port.sink.data[24:32].eq(DHCP_OPTTYP_END),
If(udp_port.sink.ready,
NextState("DONE")
@ -322,7 +318,7 @@ class LiteEthDHCPRX(LiteXModule):
self.server_ip_address = Signal(32) # o
self.offered_ip_address = Signal(48) # o
# TODO: Parse DHCP Options
# TODO: Parse DHCP Options.
# self.gateway_ip_address = Signal(32)
# self.subnet_mask = Signal(32)
# self.router = Signal(32)
@ -330,7 +326,6 @@ class LiteEthDHCPRX(LiteXModule):
# # #
# Common FSM.
# -----------
self.fsm = fsm = FSM(reset_state="IDLE")