73 lines
2.3 KiB
C++
73 lines
2.3 KiB
C++
// Copyright (2019-2022) Paul Scherrer Institute
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// SPDX-License-Identifier: CERN-OHL-S-2.0 or GPL-3.0-or-later
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#include "hls_jfjoch.h"
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void ethernet(AXI_STREAM ð_in,
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AXI_STREAM &ip_out,
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AXI_STREAM &arp_out,
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ap_uint<48> fpga_mac_addr,
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uint64_t& counter,
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volatile ap_uint<1> &in_clear_counters) {
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#pragma HLS INTERFACE ap_ctrl_none port=return
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#pragma HLS INTERFACE axis register both port=eth_in
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#pragma HLS INTERFACE axis register both port=ip_out
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#pragma HLS INTERFACE axis register both port=arp_out
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#pragma HLS INTERFACE ap_none register port=fpga_mac_addr
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#pragma HLS INTERFACE ap_vld register port=counter
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#pragma HLS INTERFACE ap_none register port=in_clear_counters
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#pragma HLS PIPELINE II=1 style=flp
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enum eth_dest {DEST_IP = 0, DEST_ARP = 1, DEST_IGNORE = 2};
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enum eth_state {INSPECT_HEADER, FORWARD, DISCARD};
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static eth_state state = INSPECT_HEADER;
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static eth_dest dest;
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static uint64_t internal_counter = 0;
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ap_uint<1> tmp = in_clear_counters;
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if (tmp)
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internal_counter = 0;
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#pragma HLS RESET variable=state
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#pragma HLS RESET variable=internal_counter
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packet_512_t packet_in;
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if (eth_in.read_nb(packet_in)) {
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if (state == INSPECT_HEADER) {
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dest = DEST_IGNORE;
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if (fpga_mac_addr != 0) {
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ap_uint < 48 > dest_mac = get_mac_addr(packet_in.data, 0);
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ap_uint < 48 > src_mac = get_mac_addr(packet_in.data, 48);
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ap_uint < 16 > ether_type = get_header_field_16(packet_in.data, 12 * 8);
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if ((dest_mac == fpga_mac_addr) && (ether_type == ETHER_IP)) {
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state = FORWARD;
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dest = DEST_IP;
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internal_counter++;
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} else if ((dest_mac == MAC_BROADCAST) && (ether_type == ETHER_ARP) && (packet_in.last)) {
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state = FORWARD;
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dest = DEST_ARP;
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}
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}
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}
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switch (dest) {
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case DEST_IP:
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ip_out.write(packet_in);
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break;
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case DEST_ARP:
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arp_out.write(packet_in);
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break;
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default:
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break;
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}
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if (packet_in.last) {
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state = INSPECT_HEADER;
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}
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}
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counter = internal_counter;
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} |