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eth: Use shared counter for fractional part of pause quanta

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Signed-off-by: Alex Forencich <alex@alexforencich.com>
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Alex Forencich
2025-04-26 20:02:35 -07:00
parent 3dc7e4821d
commit 8dc33f3a44
10 changed files with 75 additions and 47 deletions
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32
rtl/eth/taxi_mac_pause_ctrl_rx.sv
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@@ -81,8 +81,11 @@ if (MCF_PARAMS_SIZE < (PFC_EN ? 18 : 2))
logic lfc_req_reg = 1'b0, lfc_req_next;
logic [7:0] pfc_req_reg = 8'd0, pfc_req_next;
logic [QW+QFB-1:0] lfc_quanta_reg = '0, lfc_quanta_next;
logic [QW+QFB-1:0] pfc_quanta_reg[0:7], pfc_quanta_next[0:7];
logic [QFB-1:0] quanta_cnt_reg = '0, quanta_cnt_next;
logic [1:0] quanta_inc_reg = '0, quanta_inc_next;
logic [QW-1:0] lfc_quanta_reg = '0, lfc_quanta_next;
logic [QW-1:0] pfc_quanta_reg[8], pfc_quanta_next[8];
logic stat_rx_lfc_pkt_reg = 1'b0, stat_rx_lfc_pkt_next;
logic stat_rx_lfc_xon_reg = 1'b0, stat_rx_lfc_xon_next;
@@ -117,9 +120,15 @@ always_comb begin
stat_rx_pfc_xon_next = '0;
stat_rx_pfc_xoff_next = '0;
if (cfg_quanta_clk_en && rx_lfc_ack) begin
if (lfc_quanta_reg > (QW+QFB)'(cfg_quanta_step)) begin
lfc_quanta_next = lfc_quanta_reg - (QW+QFB)'(cfg_quanta_step);
quanta_cnt_next = quanta_cnt_reg;
quanta_inc_next = 0;
if (cfg_quanta_clk_en) begin
{quanta_inc_next, quanta_cnt_next} = (2+QFB)'(quanta_cnt_reg) + cfg_quanta_step;
end
if (rx_lfc_ack) begin
if (lfc_quanta_reg >= QW'(quanta_inc_reg)) begin
lfc_quanta_next = lfc_quanta_reg - QW'(quanta_inc_reg);
end else begin
lfc_quanta_next = '0;
end
@@ -130,9 +139,9 @@ always_comb begin
lfc_req_next = (lfc_quanta_reg != 0) && rx_lfc_en && cfg_rx_lfc_en;
for (integer k = 0; k < 8; k = k + 1) begin
if (cfg_quanta_clk_en && rx_pfc_ack[k]) begin
if (pfc_quanta_reg[k] > (QW+QFB)'(cfg_quanta_step)) begin
pfc_quanta_next[k] = pfc_quanta_reg[k] - (QW+QFB)'(cfg_quanta_step);
if (rx_pfc_ack[k]) begin
if (pfc_quanta_reg[k] >= QW'(quanta_inc_reg)) begin
pfc_quanta_next[k] = pfc_quanta_reg[k] - QW'(quanta_inc_reg);
end else begin
pfc_quanta_next[k] = '0;
end
@@ -148,14 +157,14 @@ always_comb begin
stat_rx_lfc_pkt_next = 1'b1;
stat_rx_lfc_xon_next = {mcf_params[7:0], mcf_params[15:8]} == 0;
stat_rx_lfc_xoff_next = {mcf_params[7:0], mcf_params[15:8]} != 0;
lfc_quanta_next = {mcf_params[7:0], mcf_params[15:8], {QFB{1'b0}}};
lfc_quanta_next = {mcf_params[7:0], mcf_params[15:8]};
end else if (PFC_EN && mcf_opcode == cfg_rx_pfc_opcode && cfg_rx_pfc_en) begin
stat_rx_pfc_pkt_next = 1'b1;
for (integer k = 0; k < 8; k = k + 1) begin
if (mcf_params[k+8]) begin
stat_rx_pfc_xon_next[k] = {mcf_params[16+(k*QW)+0 +: 8], mcf_params[16+(k*QW)+8 +: 8]} == 0;
stat_rx_pfc_xoff_next[k] = {mcf_params[16+(k*QW)+0 +: 8], mcf_params[16+(k*QW)+8 +: 8]} != 0;
pfc_quanta_next[k] = {mcf_params[16+(k*QW)+0 +: 8], mcf_params[16+(k*QW)+8 +: 8], {QFB{1'b0}}};
pfc_quanta_next[k] = {mcf_params[16+(k*QW)+0 +: 8], mcf_params[16+(k*QW)+8 +: 8]};
end
end
end
@@ -166,6 +175,9 @@ always_ff @(posedge clk) begin
lfc_req_reg <= lfc_req_next;
pfc_req_reg <= pfc_req_next;
quanta_cnt_reg <= quanta_cnt_next;
quanta_inc_reg <= quanta_inc_next;
lfc_quanta_reg <= lfc_quanta_next;
for (integer k = 0; k < 8; k = k + 1) begin
pfc_quanta_reg[k] <= pfc_quanta_next[k];