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fpga: lib: add pause support to ethernet xport

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Original-commit: d099fc3b032250bcc70e4c24f78d5eb6508850e1
This commit is contained in:
Andrew Moch
2021-06-03 11:26:54 -05:00
committed by Aaron Rossetto
parent feb849051f
commit d7acf31a38
6 changed files with 112 additions and 7 deletions
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lib/rfnoc/xport_sv/eth_ipv4_chdr_adapter.sv
+7 -1
View File
@@ -65,11 +65,14 @@ module eth_ipv4_chdr_adapter #(
input logic [47:0] my_mac,
input logic [31:0] my_ip,
input logic [15:0] my_udp_chdr_port,
input logic [15:0] my_pause_set,
input logic [15:0] my_pause_clear,
output logic chdr_dropped,
output logic cpu_dropped,
// Ethernet MAC
output logic eth_pause_req,
AxiStreamIf.master eth_tx, // tUser = {1'b0,trailing bytes};
AxiStreamIf.slave eth_rx, // tUser = {error,trailing bytes};
// CHDR router interface
@@ -90,7 +93,7 @@ module eth_ipv4_chdr_adapter #(
localparam CPU_USER_W = $clog2(CPU_W/8)+1;
localparam CHDR_USER_W = $clog2(CHDR_W/8);
localparam MAX_PACKET_BYTES = 2**16;
localparam DEBUG = 1;
localparam DEBUG = 0;
`include "eth_constants.vh"
@@ -137,12 +140,15 @@ module eth_ipv4_chdr_adapter #(
.DROP_MIN_PACKET(DROP_MIN_PACKET),
.ENET_W(ENET_W)
) eth_dispatch_i (
.eth_pause_req (eth_pause_req),
.eth_rx (eth_rx1),
.e2v (e2v1),
.e2c (e2c1),
.my_mac (my_mac),
.my_ip (my_ip),
.my_udp_chdr_port (my_udp_chdr_port),
.my_pause_set (my_pause_set),
.my_pause_clear (my_pause_clear),
.chdr_dropped (chdr_dropped),
.cpu_dropped (cpu_dropped)
);
lib/rfnoc/xport_sv/eth_ipv4_chdr_dispatch.sv
+75 -5
View File
@@ -34,6 +34,9 @@
// - my_ip : The IPv4 address of this endpoint
// - my_udp_chdr_port : The UDP port allocated for CHDR traffic on this endpoint
//
// - my pause set : number of word of fullness on CHDR_FIFO before requesting a pause
// - my pause clear : number of word of fullness on CHDR_FIFO before clearing a pause request
//
module eth_ipv4_chdr_dispatch #(
int CPU_FIFO_SIZE = $clog2(8*1024),
@@ -46,6 +49,7 @@ module eth_ipv4_chdr_dispatch #(
)(
// AXI-Stream interfaces
output logic eth_pause_req,
AxiStreamIf.slave eth_rx, // tUser={error,trailing bytes};
AxiStreamIf.master e2v, // tUser={1'b0,trailing bytes};
AxiStreamIf.master e2c, // tUser={1'b0,trailing bytes};
@@ -54,6 +58,9 @@ module eth_ipv4_chdr_dispatch #(
input logic [47:0] my_mac,
input logic [31:0] my_ip,
input logic [15:0] my_udp_chdr_port,
// Pause control
input logic [15:0] my_pause_set,
input logic [15:0] my_pause_clear,
output logic chdr_dropped,
output logic cpu_dropped
@@ -63,15 +70,17 @@ module eth_ipv4_chdr_dispatch #(
logic [47:0] e_my_mac;
logic [31:0] e_my_ip;
logic [15:0] e_my_udp_chdr_port;
logic [15:0] e_pause_set;
logic [15:0] e_pause_clear;
// crossing clock boundaries.
// my_mac, my_ip,,my_udp_chdr_port must be written
// prior to traffic, or an inconsistent version will
// exist for a clock period or 2. This would be better
// done with a full handshake.
synchronizer #(.WIDTH(96),.STAGES(1))
synchronizer #(.WIDTH(96+32),.STAGES(1))
e_info_sync (.clk(eth_rx.clk),.rst(eth_rx.rst),
.in({my_mac,my_ip,my_udp_chdr_port}),
.out({e_my_mac,e_my_ip,e_my_udp_chdr_port}));
.in({my_mac,my_ip,my_udp_chdr_port,my_pause_set,my_pause_clear}),
.out({e_my_mac,e_my_ip,e_my_udp_chdr_port,e_pause_set,e_pause_clear}));
localparam ENET_USER_W = $clog2(ENET_W/8)+1;
@@ -515,11 +524,72 @@ module eth_ipv4_chdr_dispatch #(
// transferring a packet. To ensure that upstream logic is not
// blocked, we instantiate at laeast one packet of buffering here.
// The actual size is set by CHDR_FIFO_SIZE.
logic [15:0] chdr_occupied;
logic [15:0] chdr_occupied_q;
localparam CHDR_FIFO_WORD_SIZE = CHDR_FIFO_SIZE-$clog2(ENET_W/8);
axi4s_fifo #(
.SIZE(CHDR_FIFO_SIZE-$clog2(ENET_W/8))
.SIZE(CHDR_FIFO_WORD_SIZE)
) chdr_fifo_i (
.clear(1'b0),.space(),.occupied(),
.clear(1'b0),.space(),.occupied(chdr_occupied),
.i(chdr1),.o(e2v)
);
// documentation requires pause requests to be set for a minimum of 16 clocks.
// I'm providing the same gauranteed min time in the set and clear direction
logic [3:0] pause_timer;
typedef enum logic [1:0] {
ST_IDLE = 2'd0,
ST_MIN_DELAY_SET = 2'd1,
ST_REQUESTING = 2'd2,
ST_MIN_DELAY_CLR = 2'd3
} pause_state_t;
pause_state_t pause_state = ST_IDLE;
always_ff @(posedge eth_rx.clk) begin : pause_req_ff
if (eth_rx.rst) begin
chdr_occupied_q <= 0;
eth_pause_req <= 1'b0;
pause_state <= ST_IDLE;
pause_timer <= 0;
end else begin
chdr_occupied_q <= chdr_occupied;
case (pause_state)
ST_IDLE: begin
pause_timer <= 0;
if (chdr_occupied_q >= e_pause_set) begin
eth_pause_req <= 1'b1;
pause_state <= ST_MIN_DELAY_SET;
pause_timer <= pause_timer-1; // Wrap counter to max value
end
end
ST_MIN_DELAY_SET: begin
pause_timer <= pause_timer-1;
if (pause_timer == 1) begin
pause_state <= ST_REQUESTING;
end
end
ST_REQUESTING: begin
pause_timer <= 0;
if (chdr_occupied_q <= e_pause_clear) begin
eth_pause_req <= 1'b0;
pause_state <= ST_MIN_DELAY_CLR;
pause_timer <= pause_timer-1; // Wrap counter to max value
end
end
ST_MIN_DELAY_CLR: begin
pause_timer <= pause_timer-1;
if (pause_timer == 1) begin
pause_state <= ST_IDLE;
end
end
endcase
end
end
endmodule // eth_ipv4_chdr_dispatch
lib/rfnoc/xport_sv/eth_ipv4_interface.sv
+27
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@@ -38,6 +38,7 @@ module eth_ipv4_interface #(
int PREAMBLE_BYTES = 6,
bit ADD_SOF = 1,
bit SYNC = 0,
bit PAUSE_EN = 0,
int ENET_W = 64,
int CPU_W = 64,
int CHDR_W = 64
@@ -63,6 +64,7 @@ module eth_ipv4_interface #(
output logic [15:0] my_udp_chdr_port,
// Ethernet MAC
output logic eth_pause_req,
AxiStreamIf.master eth_tx, // tUser = {1'b0,trailing bytes};
AxiStreamIf.slave eth_rx, // tUser = {error,trailing bytes};
// CHDR router interface
@@ -77,6 +79,8 @@ module eth_ipv4_interface #(
localparam [47:0] DEFAULT_MAC_ADDR = {8'h00, 8'h80, 8'h2f, 8'h16, 8'hc5, 8'h2f};
localparam [31:0] DEFAULT_IP_ADDR = {8'd192, 8'd168, 8'd10, 8'd2};
localparam [31:0] DEFAULT_UDP_PORT = 16'd49153;
localparam [15:0] DEFAULT_PAUSE_SET = 16'd00040;
localparam [15:0] DEFAULT_PAUSE_CLEAR = 16'd00020;
//---------------------------------------------------------
// Registers
@@ -102,6 +106,8 @@ module eth_ipv4_interface #(
logic chdr_dropped;
logic [31:0] chdr_drop_count = 0;
logic [31:0] cpu_drop_count = 0;
logic [15:0] my_pause_set = DEFAULT_PAUSE_SET;
logic [15:0] my_pause_clear = DEFAULT_PAUSE_CLEAR;
always_comb begin : bridge_mux
my_mac = bridge_en ? bridge_mac_reg : mac_reg;
@@ -118,6 +124,8 @@ module eth_ipv4_interface #(
bridge_mac_reg <= DEFAULT_MAC_ADDR;
bridge_ip_reg <= DEFAULT_IP_ADDR;
bridge_udp_port <= DEFAULT_UDP_PORT;
my_pause_set <= DEFAULT_PAUSE_SET;
my_pause_clear <= DEFAULT_PAUSE_CLEAR;
end
else begin
if (reg_wr_req)
@@ -149,6 +157,14 @@ module eth_ipv4_interface #(
REG_BRIDGE_ENABLE:
bridge_en <= reg_wr_data[0];
REG_PAUSE:
begin
if (PAUSE_EN) begin
my_pause_set <= reg_wr_data[15:0];
my_pause_clear <= reg_wr_data[31:16];
end
end
endcase
end
end
@@ -210,6 +226,14 @@ module eth_ipv4_interface #(
reg_rd_data <= cpu_drop_count;
cpu_drop_count <= 0; // clear when read
end
REG_PAUSE:
begin
if (PAUSE_EN) begin
reg_rd_data[15:0] <= my_pause_set;
reg_rd_data[31:16] <= my_pause_clear;
end
end
default:
reg_rd_resp <= 1'b0;
endcase
@@ -256,6 +280,7 @@ module eth_ipv4_interface #(
.CPU_W (CPU_W),
.CHDR_W (CHDR_W)
) eth_adapter_i (
.eth_pause_req (eth_pause_req),
.eth_rx (eth_rx ),
.eth_tx (eth_tx ),
.v2e (v2e ),
@@ -266,6 +291,8 @@ module eth_ipv4_interface #(
.my_mac (my_mac ),
.my_ip (my_ip ),
.my_udp_chdr_port(my_udp_chdr_port),
.my_pause_set (my_pause_set),
.my_pause_clear (my_pause_clear),
.chdr_dropped (e_chdr_dropped),
.cpu_dropped (e_cpu_dropped)
);
lib/rfnoc/xport_sv/eth_ipv4_internal.sv
+1
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@@ -365,6 +365,7 @@ module eth_ipv4_internal #(
.reg_rd_addr (reg_rd_addr),
.reg_rd_resp (reg_rd_resp_eth_if),
.reg_rd_data (reg_rd_data_eth_if),
.eth_pause_req (),
.eth_tx (e2h_chdr),
.eth_rx (h2e_chdr),
.e2v (e2v_chdr),
lib/rfnoc/xport_sv/eth_regs.vh
+1
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@@ -30,3 +30,4 @@ localparam [REG_AWIDTH-1:0] REG_BRIDGE_ENABLE = BASE + 'h1020;
localparam [REG_AWIDTH-1:0] REG_CHDR_DROPPED = BASE + 'h1030;
localparam [REG_AWIDTH-1:0] REG_CPU_DROPPED = BASE + 'h1034;
localparam [REG_AWIDTH-1:0] REG_PAUSE = BASE + 'h1038;