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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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50
rtl/eth/taxi_mac_pause_ctrl_tx.sv
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@@ -95,8 +95,11 @@ logic [7:0] pfc_act_reg = 8'd0, pfc_act_next;
logic [7:0] pfc_en_reg = 8'd0, pfc_en_next;
logic pfc_send_reg = 1'b0, pfc_send_next;
logic [QW+QFB-1:0] lfc_refresh_reg = '0, lfc_refresh_next;
logic [QW+QFB-1:0] pfc_refresh_reg[0:7], pfc_refresh_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_refresh_reg = '0, lfc_refresh_next;
logic [QW-1:0] pfc_refresh_reg[8], pfc_refresh_next[8];
logic stat_tx_lfc_pkt_reg = 1'b0, stat_tx_lfc_pkt_next;
logic stat_tx_lfc_xon_reg = 1'b0, stat_tx_lfc_xon_next;
@@ -168,31 +171,29 @@ always_comb begin
stat_tx_pfc_xon_next = '0;
stat_tx_pfc_xoff_next = '0;
quanta_cnt_next = quanta_cnt_reg;
quanta_inc_next = 0;
if (cfg_quanta_clk_en) begin
if (lfc_refresh_reg > (QW+QFB)'(cfg_quanta_step)) begin
lfc_refresh_next = lfc_refresh_reg - (QW+QFB)'(cfg_quanta_step);
end else begin
lfc_refresh_next = '0;
if (lfc_req_reg) begin
lfc_send_next = 1'b1;
end
end
{quanta_inc_next, quanta_cnt_next} = (2+QFB)'(quanta_cnt_reg) + cfg_quanta_step;
end
if (lfc_refresh_reg >= QW'(quanta_inc_reg)) begin
lfc_refresh_next = lfc_refresh_reg - QW'(quanta_inc_reg);
end else begin
lfc_refresh_next = lfc_refresh_reg;
lfc_refresh_next = '0;
if (lfc_req_reg) begin
lfc_send_next = 1'b1;
end
end
for (integer k = 0; k < 8; k = k + 1) begin
if (cfg_quanta_clk_en) begin
if (pfc_refresh_reg[k] > (QW+QFB)'(cfg_quanta_step)) begin
pfc_refresh_next[k] = pfc_refresh_reg[k] - (QW+QFB)'(cfg_quanta_step);
end else begin
pfc_refresh_next[k] = 0;
if (pfc_req_reg[k]) begin
pfc_send_next = 1'b1;
end
end
if (pfc_refresh_reg[k] >= QW'(quanta_inc_reg)) begin
pfc_refresh_next[k] = pfc_refresh_reg[k] - QW'(quanta_inc_reg);
end else begin
pfc_refresh_next[k] = pfc_refresh_reg[k];
pfc_refresh_next[k] = '0;
if (pfc_req_reg[k]) begin
pfc_send_next = 1'b1;
end
end
end
@@ -208,7 +209,7 @@ always_comb begin
mcf_pfc_sel_next = 1'b0;
mcf_valid_next = lfc_act_reg;
lfc_act_next = lfc_req_reg;
lfc_refresh_next = lfc_req_reg ? {cfg_tx_lfc_refresh, {QFB{1'b0}}} : '0;
lfc_refresh_next = lfc_req_reg ? cfg_tx_lfc_refresh : '0;
lfc_send_next = 1'b0;
stat_tx_lfc_pkt_next = lfc_act_reg;
@@ -232,7 +233,7 @@ always_comb begin
pfc_en_next = pfc_act_reg;
pfc_act_next = pfc_req_reg;
for (integer k = 0; k < 8; k = k + 1) begin
pfc_refresh_next[k] = pfc_req_reg[k] ? {cfg_tx_pfc_refresh[k], {QFB{1'b0}}} : '0;
pfc_refresh_next[k] = pfc_req_reg[k] ? cfg_tx_pfc_refresh[k] : '0;
end
pfc_send_next = 1'b0;
@@ -256,6 +257,9 @@ always_ff @(posedge clk) begin
mcf_pfc_sel_reg <= mcf_pfc_sel_next;
mcf_valid_reg <= mcf_valid_next;
quanta_cnt_reg <= quanta_cnt_next;
quanta_inc_reg <= quanta_inc_next;
lfc_refresh_reg <= lfc_refresh_next;
for (integer k = 0; k < 8; k = k + 1) begin
pfc_refresh_reg[k] <= pfc_refresh_next[k];