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fpga: lib: Add MTU parameter to eth_internal

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Original-commit: 2745b6c01b75ae4480a38f91b9601c231ce1ea72
This commit is contained in:
Wade Fife
2022-09-01 14:41:55 -05:00
parent 354b59e430
commit 919acb248f
1 changed files with 29 additions and 8 deletions
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lib/rfnoc/xport/eth_internal.v
+29 -8
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@@ -1,22 +1,43 @@
///////////////////////////////////////////////////////////////////
//
// Copyright 2019 Ettus Research, a National Instruments brand
// Copyright 2019 Ettus Research, a National Instruments Brand
//
// SPDX-License-Identifier: LGPL-3.0-or-later
//
// Module: eth_internal
// Description:
// Reduces clutter at top level.
// - FPGA-internal Ethernet port
// - ARP responder instead of other CPU connection
//
//////////////////////////////////////////////////////////////////////
// Description:
//
// This internal Ethernet port is responsible for routing CHDR data between
// the ARM CPU and RFNoC. Treating the RFNoC interface to the CPU like an
// internal Ethernet device allows the ARM processor to take advantage of
// highly optimized DMA engines and software designed for Ethernet. This
// block also includes an ARP responder for IP address discovery.
//
// Prefixes are used to distinguish the various AXI-Stream buses:
//
// - e2h : Ethernet to Host (Ethernet transport adapter to ARM)
// - h2e : Host to Ethernet (ARM to Ethernet transport adapter)
// - e2v : Ethernet to CHDR (Ethernet transport to RFNoC)
// - v2e : CHDR to Ethernet (RFNoC to Ethernet transport adapter)
// - e2c : Ethernet to CPU (Ethernet transport adapter to ARP responder)
// - c2e : CPU to Ethernet (ARP responder to Ethernet transport adapter)
//
// Parameters:
//
// DWIDTH : Data width for AXI-Lite interface (32 or 64)
// AWIDTH : Address width for AXI-Lite interface
// PORTNUM : Ethernet port number
// BYTE_MTU : Sets the MTU to 2^BYTE_MTU bytes
// RFNOC_PROTOVER : 16-bit RFNoC protocol version (major[7:0], minor[7:0])
// NODE_INST : The node instance to identify this transport adapter
//
`default_nettype none
module eth_internal #(
parameter DWIDTH = 32,
parameter AWIDTH = 14,
parameter [7:0] PORTNUM = 0,
parameter BYTE_MTU = $clog2(8192),
parameter [15:0] RFNOC_PROTOVER = {8'd1, 8'd0},
parameter NODE_INST = 0
)(
@@ -276,7 +297,7 @@ module eth_internal #(
eth_interface #(
.PROTOVER(RFNOC_PROTOVER),
.MTU(10),
.MTU(BYTE_MTU-3), // Log base 2 of the MTU in 64-bit words
.NODE_INST(NODE_INST),
.REG_AWIDTH (AWIDTH),
.BASE(REG_BASE_ETH_SWITCH)