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White Rabbit core collection
Commit d16c342d authored by Tomasz Wlostowski's avatar Tomasz Wlostowski
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wr_mini_nic: partially fixed hang-on-RX-flood bug

parent b0658a59
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modules/wr_mini_nic/wr_mini_nic.vhd
View file @ d16c342d
......@@ -6,7 +6,7 @@
-- Author : Tomasz Wlostowski
-- Company : CERN BE-Co-HT
-- Created : 2010-07-26
-- Last update: 2012-06-05
-- Last update: 2012-07-13
-- Platform : FPGA-generic
-- Standard : VHDL
-------------------------------------------------------------------------------
......@@ -222,7 +222,7 @@ architecture behavioral of wr_mini_nic is
-- RX FSM stuff
-------------------------------------------------------------------------------
type t_rx_fsm_state is (RX_WAIT_SOF, RX_MEM_RESYNC, RX_MEM_FLUSH, RX_ALLOCATE_DESCRIPTOR, RX_DATA, RX_UPDATE_DESC);
type t_rx_fsm_state is (RX_WAIT_SOF, RX_MEM_RESYNC, RX_MEM_FLUSH, RX_ALLOCATE_DESCRIPTOR, RX_DATA, RX_UPDATE_DESC, RX_IGNORE, RX_BUF_FULL);
signal nrx_state : t_rx_fsm_state;
signal nrx_avail : unsigned(g_memsize_log2-1 downto 0);
......@@ -525,7 +525,7 @@ begin -- behavioral
if(ntx_cntr_is_zero = '1') then
src_stb_int <= '0';
ntx_state <= TX_OOB1;
-- ntx_mem_a <= ntx_mem_a + 1;
-- ntx_mem_a <= ntx_mem_a + 1;
else
ntx_cntr <= ntx_cntr - 1;
ntx_state <= TX_LWORD;
......@@ -712,9 +712,7 @@ begin -- behavioral
regs_in.mcr_rx_full_i <= '0';
nrx_newpacket <= '0';
snk_err_o <= '0';
snk_cyc_d0 <= '0';
else
snk_cyc_d0 <= snk_cyc_i;
-- Host can modify the RX DMA registers only when the DMA engine is disabled
-- (MCR_RX_EN = 0)
......@@ -735,7 +733,7 @@ begin -- behavioral
nrx_mem_a_saved <= unsigned(regs_out.rx_addr_o(g_memsize_log2+1 downto 2));
nrx_bufstart <= unsigned(regs_out.rx_addr_o(g_memsize_log2+1 downto 2));
regs_in.rx_addr_i <= (others => '0');
-- nrx_mem_a <= unsigned(minic_rx_addr_new(g_memsize_log2+1 downto 2));
-- nrx_mem_a <= unsigned(minic_rx_addr_new(g_memsize_log2+1 downto 2));
end if;
if(regs_out.rx_size_load_o = '1') then
......@@ -758,6 +756,15 @@ begin -- behavioral
-- State "Wait for start of frame". We wait until there's a start-of-frame condition
-- on the RX fabric and then we commence reception of the packet.
-------------------------------------------------------------------------------
--when RX_BUFFER_FULL =>
-- if(nrx_buf_full = '0') then
-- nrx_stall_mask <= '0';
-- nrx_state <= RX_WAIT_SOF;
-- else
-- nrx_stall_mask <= '1';
-- end if;
when RX_WAIT_SOF =>
-- TRIG0(2 downto 0) <= "000";
......@@ -774,7 +781,7 @@ begin -- behavioral
regs_in.mcr_rx_full_i <= nrx_buf_full;
snk_err_o <= nrx_buf_full;
if(snk_cyc_i = '1' and snk_cyc_d0 = '0' and nrx_buf_full = '0') then -- got start-of-frame?
if(snk_cyc_i = '1' and nrx_buf_full = '0') then -- got start-of-frame?
nrx_stall_mask <= '1';
nrx_state <= RX_ALLOCATE_DESCRIPTOR;
else
......@@ -1003,12 +1010,37 @@ begin -- behavioral
regs_in.mcr_rx_ready_i <= '1';
-- wait for another packet
nrx_state <= RX_WAIT_SOF;
if(snk_cyc_i = '1') then
nrx_state <= RX_IGNORE;
elsif(nrx_buf_full = '1') then
nrx_state <= RX_BUF_FULL;
nrx_stall_mask <= '1';
else
nrx_state <= RX_WAIT_SOF;
end if;
else
nrx_mem_wr <= '0';
end if;
when others => null;
when RX_IGNORE =>
nrx_stall_mask <= '0';
if(snk_cyc_i = '0') then
if(nrx_buf_full = '1') then
nrx_stall_mask <= '1';
nrx_state <= RX_BUF_FULL;
else
nrx_state <= RX_WAIT_SOF;
end if;
end if;
when RX_BUF_FULL =>
if(nrx_buf_full = '0') then
nrx_stall_mask <= '0';
nrx_state <= RX_WAIT_SOF;
else
nrx_stall_mask <= '1';
end if;
end case;
end if;
end if;
......@@ -1028,11 +1060,11 @@ begin -- behavioral
snk_stall_int <= '1';
elsif(regs_out.mcr_rx_en_o = '0' or nrx_state = RX_ALLOCATE_DESCRIPTOR or nrx_state = RX_UPDATE_DESC or nrx_state = RX_MEM_FLUSH) then
snk_stall_int <= '1';
-- the condition below forces the RX FSM to go into RX_MEM_RESYNC state. Don't
-- receive anything during this time
-- the condition below forces the RX FSM to go into RX_MEM_RESYNC state. Don't
-- receive anything during this time
elsif(nrx_toggle = '1' and mem_arb_rx = '1') then
snk_stall_int <= '1';
elsif(nrx_stall_mask = '1' or (snk_cyc_d0 = '1' and snk_cyc_i = '0')) then
elsif(nrx_stall_mask = '1') then
snk_stall_int <= '1';
else
snk_stall_int <= '0';
......
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