module fib_lookup_fsm
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module fib_lookup_fsm
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(/*AUTOARG*/
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(/*AUTOARG*/
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// Outputs
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// Outputs
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lpp_drdy, ft_wdata, ft_rd_en, ft_wr_en, ft_addr, lout_data,
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lpp_drdy, ft_wdata, ft_rd_en, ft_wr_en, ft_addr, lout_data,
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lout_srdy, lout_dst_vld,
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lout_srdy, lout_dst_vld,
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// Inputs
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// Inputs
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clk, reset, lpp_data, lpp_srdy, ft_rdata, lout_drdy
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clk, reset, lpp_data, lpp_srdy, ft_rdata, lout_drdy
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);
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);
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input clk, reset;
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input clk, reset;
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input [`PAR_DATA_SZ-1:0] lpp_data;
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input [`PAR_DATA_SZ-1:0] lpp_data;
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input lpp_srdy;
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input lpp_srdy;
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output reg lpp_drdy;
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output reg lpp_drdy;
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input [`FIB_ENTRY_SZ-1:0] ft_rdata;
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input [`FIB_ENTRY_SZ-1:0] ft_rdata;
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output reg [`FIB_ENTRY_SZ-1:0] ft_wdata;
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output reg [`FIB_ENTRY_SZ-1:0] ft_wdata;
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output reg ft_rd_en, ft_wr_en;
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output reg ft_rd_en, ft_wr_en;
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output reg [`FIB_ASZ-1:0] ft_addr;
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output reg [`FIB_ASZ-1:0] ft_addr;
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output reg [`NUM_PORTS-1:0] lout_data;
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output reg [`NUM_PORTS-1:0] lout_data;
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output reg lout_srdy;
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output reg lout_srdy;
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input lout_drdy;
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input lout_drdy;
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output [`NUM_PORTS-1:0] lout_dst_vld;
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output [`NUM_PORTS-1:0] lout_dst_vld;
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wire [`FIB_ASZ-1:0] hf_out;
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wire [`FIB_ASZ-1:0] hf_out;
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reg [47:0] hf_in;
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reg [47:0] hf_in;
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wire [`NUM_PORTS-1:0] source_port_mask;
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wire [`NUM_PORTS-1:0] source_port_mask;
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reg [`FIB_ASZ-1:0] init_ctr, nxt_init_ctr;
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reg [`FIB_ASZ-1:0] init_ctr, nxt_init_ctr;
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reg [4:0] state, nxt_state;
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reg [4:0] state, nxt_state;
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assign source_port_mask = 1 << lpp_data[`PAR_SRCPORT];
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assign source_port_mask = 1 << lpp_data[`PAR_SRCPORT];
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basic_hashfunc #(48, `FIB_ENTRIES) hashfunc
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basic_hashfunc #(48, `FIB_ENTRIES) hashfunc
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(
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(
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// Outputs
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// Outputs
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.hf_out (hf_out),
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.hf_out (hf_out),
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// Inputs
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// Inputs
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.hf_in (hf_in));
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.hf_in (hf_in));
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localparam s_idle = 0, s_da_lookup = 1, s_sa_lookup = 2,
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localparam s_idle = 0, s_da_lookup = 1, s_sa_lookup = 2,
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s_init0 = 3, s_init1 = 4;
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s_init0 = 3, s_init1 = 4;
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localparam ns_idle = 1, ns_da_lookup = 2, ns_sa_lookup = 4,
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localparam ns_idle = 1, ns_da_lookup = 2, ns_sa_lookup = 4,
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ns_init0 = 8, ns_init1 = 16;
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ns_init0 = 8, ns_init1 = 16;
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// send all results back to their originating port
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// send all results back to their originating port
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assign lout_dst_vld = source_port_mask;
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assign lout_dst_vld = source_port_mask;
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reg amux;
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reg amux;
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always @*
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always @*
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begin
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begin
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case (amux)
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case (amux)
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0 : ft_addr = hf_out;
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0 : ft_addr = hf_out;
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1 : ft_addr = init_ctr;
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1 : ft_addr = init_ctr;
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endcase // case (amux)
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endcase // case (amux)
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end
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end
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always @*
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always @*
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begin
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begin
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hf_in = 0;
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hf_in = 0;
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nxt_state = state;
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nxt_state = state;
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ft_rd_en = 0;
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ft_rd_en = 0;
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ft_wr_en = 0;
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ft_wr_en = 0;
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amux = 0;
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amux = 0;
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lout_data = 0;
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lout_data = 0;
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lout_srdy = 0;
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lout_srdy = 0;
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lpp_drdy = 0;
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lpp_drdy = 0;
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nxt_init_ctr = init_ctr;
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nxt_init_ctr = init_ctr;
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case (1'b1)
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case (1'b1)
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state[s_idle] :
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state[s_idle] :
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begin
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begin
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// DA lookup
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// DA lookup
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if (lpp_srdy)
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begin
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if (lpp_data[`PAR_MACDA] & `MULTICAST)
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if (lpp_data[`PAR_MACDA] & `MULTICAST)
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begin
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begin
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// flood the packet, don't bother to do DA lookup
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// flood the packet, don't bother to do DA lookup
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lout_data = ~source_port_mask;
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lout_data = ~source_port_mask;
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lout_srdy = 1;
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lout_srdy = 1;
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if (lout_drdy)
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if (lout_drdy)
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nxt_state = ns_sa_lookup;
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nxt_state = ns_sa_lookup;
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end
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end
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else if (lpp_srdy)
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else
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begin
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begin
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hf_in = lpp_data[`PAR_MACDA];
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hf_in = lpp_data[`PAR_MACDA];
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ft_rd_en = 1;
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ft_rd_en = 1;
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nxt_state = ns_da_lookup;
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nxt_state = ns_da_lookup;
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end // else: !if(lpp_data[`PAR_MACDA] & `MULTICAST)
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end
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end
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end
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end
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// results from DA lookup are available this
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// results from DA lookup are available this
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// state. Make forwarding decision at this
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// state. Make forwarding decision at this
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// point.
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// point.
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state[s_da_lookup] :
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state[s_da_lookup] :
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begin
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begin
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// no match, flood packet
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// no match, flood packet
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if (ft_rdata[`FIB_AGE] == 0)
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if (ft_rdata[`FIB_AGE] == 0)
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begin
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begin
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lout_data = ~source_port_mask;
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lout_data = ~source_port_mask;
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end
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end
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else
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else
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begin
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begin
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lout_data = (1 << ft_rdata[`FIB_PORT]) & ~source_port_mask;
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lout_data = (1 << ft_rdata[`FIB_PORT]) & ~source_port_mask;
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end
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end
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lout_srdy = 1;
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lout_srdy = 1;
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if (lout_drdy)
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if (lout_drdy)
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nxt_state = ns_sa_lookup;
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nxt_state = ns_sa_lookup;
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end // case: state[s_da_lookup]
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end // case: state[s_da_lookup]
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// blind write out MACSA to FIB table
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// blind write out MACSA to FIB table
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// will bump out current occupant and update
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// will bump out current occupant and update
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state[s_sa_lookup] :
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state[s_sa_lookup] :
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begin
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begin
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ft_wr_en = 1;
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ft_wr_en = 1;
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hf_in = lpp_data[`PAR_MACSA];
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hf_in = lpp_data[`PAR_MACSA];
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ft_wdata[`FIB_MACADDR] = lpp_data[`PAR_MACSA];
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ft_wdata[`FIB_MACADDR] = lpp_data[`PAR_MACSA];
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ft_wdata[`FIB_AGE] = `FIB_MAX_AGE;
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ft_wdata[`FIB_AGE] = `FIB_MAX_AGE;
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ft_wdata[`FIB_PORT] = lpp_data[`PAR_SRCPORT];
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ft_wdata[`FIB_PORT] = lpp_data[`PAR_SRCPORT];
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nxt_state = ns_idle;
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nxt_state = ns_idle;
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lpp_drdy = 1;
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lpp_drdy = 1;
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end
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end
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state[s_init0] :
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state[s_init0] :
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begin
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begin
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nxt_init_ctr = 0;
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nxt_init_ctr = 0;
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nxt_state = ns_init1;
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nxt_state = ns_init1;
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end
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end
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state[s_init1] :
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state[s_init1] :
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begin
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begin
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nxt_init_ctr = init_ctr + 1;
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nxt_init_ctr = init_ctr + 1;
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ft_wr_en = 1;
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ft_wr_en = 1;
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amux = 1;
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amux = 1;
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ft_wdata = 0;
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ft_wdata = 0;
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if (init_ctr == (`FIB_ENTRIES-1))
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if (init_ctr == (`FIB_ENTRIES-1))
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nxt_state = ns_idle;
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nxt_state = ns_idle;
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end
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end
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default :
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default :
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nxt_state = ns_idle;
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nxt_state = ns_idle;
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endcase // case (1'b1)
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endcase // case (1'b1)
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end // always @ *
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end // always @ *
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always @(posedge clk)
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always @(posedge clk)
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begin
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begin
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if (reset)
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if (reset)
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begin
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begin
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init_ctr <= #1 0;
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init_ctr <= #1 0;
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state <= #1 ns_init0;
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state <= #1 ns_init0;
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end
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end
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else
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else
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begin
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begin
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init_ctr <= #1 nxt_init_ctr;
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init_ctr <= #1 nxt_init_ctr;
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state <= #1 nxt_state;
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state <= #1 nxt_state;
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end
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end
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end
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end
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endmodule // fib_lookup_fsm
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endmodule // fib_lookup_fsm
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