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Message-ID: <CAFXsbZoMcOQTY8HE+E359jT6Vsod3LiovTODpjndHKzhTBZcTg@mail.gmail.com> Date: Sat, 18 Jul 2020 07:49:26 -0700 From: Chris Healy <cphealy@...il.com> To: Marek Behun <marek.behun@....cz> Cc: netdev <netdev@...r.kernel.org> Subject: Re: bug: net: dsa: mv88e6xxx: serdes Unable to communicate on fiber with vf610-zii-dev-rev-c On Sat, Jul 18, 2020 at 7:42 AM Marek Behun <marek.behun@....cz> wrote: > > Hmm, nothing sticks out in the register dump. > > I encountered a similar problem 2 years ago on Topaz SERDES port when > the cmode was set to 2500BASE-X but the speed register was set to speed > incompatible with 2500BASE-X (I don't remember what, though). This > issue was solved by a patch I sent to netdev. > > Are you sure that your board isn't broken? Maybe the SerDes traces on > RX path are damaged... In my case, both the SERDES and the MAC are inside the switch so I don't think it's likely that the SERDES traces are broken in there. If you are referring to the traces between the SERDES and the fiber module, that doesn't feel likely either as the SERDES appears to be reporting successfully received frames: >From "ethtool -S" after sending 6 packets to the unit: serdes_rx_pkts: 6 serdes_rx_bytes: 384 serdes_rx_pkts_error: 0 If the traces were broken between the fiber module and the SERDES, I should not see these counters incrementing. > > Marek > > On Sat, 18 Jul 2020 07:27:33 -0700 > Chris Healy <cphealy@...il.com> wrote: > > > I've been trying to get the fiber interface of the vf610-zii-dev-rev-c > > board working with net-next to no avail. This platform utilizes a > > Cotsworks SFF attached to port 9 of a Marvell 88E6390X. > > > > I have fiber link up on port 9 and am able to send packets from the > > management CPU of the switch through the switch and out port 9 through > > the fiber interface to a fiber link partner successfully. I'm also > > able to send packets from that fiber link partner back (to the point > > of the switches SERDES) and am seeing the fiber ports SERDES RX > > counters increment for each packet transmitted by the link partner. > > The switches port 9 MAC is not showing any RX counters incrementing > > though and I do not receive the frames at the management CPU. > > > > Because the SERDES RX counters are incrementing while the MAC RX > > counters are not incrementing, it seems to me that the issue is > > between the MAC and SERDES. This is odd to me given that TX works > > fine. > > > > In support of debugging this issue, I've applied an ethtool patch > > which allows decoding the 88E6390X SERDES registers from userspace. > > Looking at the register dump, nothing obvious sticks out to me though. > > > > I'm not sure what the right next steps are and would appreciate any > > theories on what to try/test to root cause this issue. > > > > Below is an ethtool register dump and an ethtool statistics dump from > > when the link is up and I have done some attempts at pinging a remote > > host over fiber. > > > > root@(none):~$ ethtool -d sff2 > > 88E6390X Switch Port Registers > > ------------------------------ > > 00: Port Status 0xce49 > > Transmit Pause Enable bit 1 > > Receive Pause Enable bit 1 > > 802.3 PHY Detected 0 > > Link Status Up > > Duplex Full > > Speed 1000 Mbps > > Duplex Fixed 0 > > EEE Enabled 1 > > Transmitter Paused 0 > > Flow Control 0 > > Config Mode 0x9 > > 01: Physical Control 0x203e > > RGMII Receive Timing Control Default > > RGMII Transmit Timing Control Default > > Force Speed 1 > > Alternate Speed Mode Normal > > MII PHY Mode MAC > > EEE force value 0 > > Force EEE 0 > > Link's Forced value Up > > Force Link 1 > > Duplex's Forced value Full > > Force Duplex 1 > > Force Speed 1000 Mbps > > 02: Flow Control 0x0100 > > 03: Switch Identifier 0x0a11 > > 04: Port Control 0x0433 > > Source Address Filtering controls Disabled > > Egress Mode Unmodified > > Ingress & Egress Header Mode 0 > > IGMP and MLD Snooping 1 > > Frame Mode Normal > > VLAN Tunnel 0 > > TagIfBoth 0 > > Initial Priority assignment Tag & IP Priority > > Egress Flooding mode No unknown DA > > Port State Forwarding > > 05: Port Control 1 0x0000 > > Message Port 0 > > LAG Port 0 > > VTU Page 0 > > LAG ID 0 > > FID[11:4] 0x000 > > 06: Port Base VLAN Map (Header) 0x0400 > > FID[3:0] 0x000 > > Force Mapping 0 > > VLANTable 10 > > 07: Default VLAN ID & Priority 0x0000 > > Default Priority 0x0 > > Force to use Default VID 0 > > Default VLAN Identifier 0 > > 08: Port Control 2 0x0080 > > Force good FCS in the frame 0 > > Allow bad FCS 0 > > Jumbo Mode 1522 > > 802.1QMode Disabled > > Discard Tagged Frames 0 > > Discard Untagged Frames 0 > > Map using DA hits 1 > > ARP Mirror enable 0 > > Egress Monitor Source Port 0 > > Ingress Monitor Source Port 0 > > Allow VID of Zero 0 > > Default Queue Priority 0x0 > > 09: Egress Rate Control 0x0001 > > 10: Egress Rate Control 2 0x0000 > > 11: Port Association Vector 0x0200 > > 12: Port ATU Control 0x0000 > > 13: Override 0x0000 > > 14: Policy Control 0x0000 > > 15: Port Ether Type 0x9100 > > 16: Reserved 0x0000 > > 17: Reserved 0x0000 > > 18: Reserved 0x0000 > > 19: Reserved 0x0000 > > 20: Reserved 0x0000 > > 21: Reserved 0x0000 > > 22: LED Control 0x0033 > > 23: IP Priority Mapping Table 0x0000 > > 24: IEEE Priority Mapping Table 0x3e07 > > 25: Port Control 3 0x0000 > > 26: Reserved 0x0000 > > 27: Queue Counters 0x8000 > > 28: Queue Control 0x0000 > > 29: Reserved 0x0000 > > 30: Cut Through Control 0x0000 > > 31: Debug Counters 0x0000 > > > > 88E6390X Switch Port SERDES Registers > > ------------------------------------- > > f000: Global Clock Configuration 1 0x0000 > > f001: Global Clock Configuration 2 0x0002 > > f002: Port Operational Configuration 0x0003 > > f00a: FIFO and CRC Int Enable 0x0000 > > f00b: FIFO and CRC Int Status 0x0000 > > f00c: PPM FIFO Control 1 0x0000 > > f00d: PPM FIFO Control 2 0x0000 > > f00e: PPM FIFO Status 0x0000 > > f010: Packet Generation Control 1 0x0501 > > f011: Packet Generation Control 2 0x0000 > > f012: Initial Payload 0-1/Packet Generation 0x0000 > > f013: Initial Payload 2-3/Packet Generation 0x0000 > > f016: Packet Generation Length 0x0000 > > f017: Packet Generation Burst Sequence 0x0000 > > f018: Packet Generation IPG 0x0002 > > f019: Packet Gen_Chkr Clock Control 0x0000 > > f01a: Transmit Powerdown Delay 0x0032 > > f01b: Transmit Packet Counter [15:0] 0x0000 > > f01c: Transmit Packet Counter [31:16] 0x0000 > > f01d: Transmit Packet Counter [47:32] 0x0000 > > f01e: Transmit Byte Counter [15:0] 0x0000 > > f01f: Transmit Byte Counter [31:16] 0x0000 > > f020: Transmit Byte Counter [47:32] 0x0000 > > f021: Receive Packet Counter [15:0] 0x0000 > > f022: Receive Packet Counter [31:16] 0x0000 > > f023: Receive Packet Counter [47:32] 0x0000 > > f024: Receive Byte Count [15:0] 0x0000 > > f025: Receive Byte Count [31:16] 0x0000 > > f026: Receive Byte Count [47:32] 0x0000 > > f027: Receive Packet Error Count [15:0] 0x0000 > > f028: Receive Packet Error Count [31:16] 0x0000 > > f029: Receive Packet Error Count [47:32] 0x0000 > > f030: PRBS Control 0x0200 > > f031: PRBS Symbol Tx Counter [15:0] 0x0000 > > f032: PRBS Symbol Tx Counter [31:16] 0x0000 > > f033: PRBS Symbol Tx Counter [47:32] 0x0000 > > f034: PRBS Symbol Rx Counter [15:0] 0x0000 > > f035: PRBS Symbol Rx Counter [31:16] 0x0000 > > f036: PRBS Symbol RX Counter [47:32] 0x0000 > > f037: PRBS Error Count [15:0] 0x0000 > > f038: PRBS Error Count [31:16] 0x0000 > > f039: PRBS Error Count [47:32] 0x0000 > > 2000: 1000BASE-X/SGMII Control Register 0x1140 > > Reset 0 > > Loopback 0 > > SGMII Speed 1000 Mbps > > Autoneg Enable 1 > > Power down 0 > > Isolate 0 > > Restart Autonet 0 > > Duplex Full > > 2001: 1000BASE-X/SGMII Status Register 0x016d > > Autoneg Complete 1 > > Remote Fault 0 > > Link Status Up > > 2002: PHY Identifier 0x0141 > > 2003: PHY Identifier 0x0c00 > > 2004: SGMII (Media side) Auto-Negotiation Ad 0x00a0 > > Link Status Down > > Duplex Half > > SGMII Speed 10 Mbps > > Transmit Pause 0 > > Receive Pause 0 > > Fibre/Copper Fibre > > EEE mode 0 > > Clock stopped during LPI 1 > > 2005: SGMII (Media side) Link Partner Abilit 0x40a0 > > Acknowledge 1 > > 2006: 1000BASE-X Auto-Negotiation Expansion 0x0007 > > 2007: 1000BASE-X Next Page Transmit Register 0x2801 > > 2008: 1000BASE-X Link Partner Next Page Regi 0x0000 > > 200f: Extended Status Register 0x8000 > > a000: 1000BASE-X Timer Mode Select Register 0x2000 > > a001: 1000BASE-X Interrupt Enable Register 0x0600 > > Speed Changed 0 > > Duplex Changed 0 > > Page Received 0 > > Autoneg Complete 0 > > Link Up->Link Down 1 > > Link Down->Link Up 1 > > Symbol Error 0 > > False Carrier 0 > > a002: 1000BASE-X Interrupt Status Register 0x0000 > > Speed Changed 0 > > Duplex Changed 0 > > Page Received 0 > > Autoneg Complete 0 > > Link Up->Link Down 0 > > Link Down->Link Up 0 > > Symbol Error 0 > > False Carrier 0 > > a003: 1000BASE-X PHY Specific Status 0xac2c > > Speed 1000 Mbps > > Duplex Full > > Page Received 0 > > Speed/Duplex Resolved 1 > > Link Up > > Sync 1 > > Energy Detect 0 > > Transmit Pause 0 > > Receive Pause 0 > > 1000: 10GBASE-X4 PCS Control 1 0x2040 > > 1001: 10GBASE-X4 PCS Status 1 0x0082 > > 1002: PCS Device Identifier 1 0x0141 > > 1003: PCS Device Identifier 2 0x0c00 > > 1004: PCS Speed Ability 0x0001 > > 1005: PCS Devices In Package 1 0x009a > > 1006: PCS Devices In Package 2 0x4000 > > 1007: Reserved 0x0001 > > 1008: 10GBASE-X4 PCS Status 2 0x8402 > > 100e: PCS Package Identifier 1 0x0141 > > 100f: PCS Package Identifier 2 0x0c00 > > 1014: PCS EEE Capability Register 0x0000 > > 1018: 10GBase-X Lane Status 0x0c01 > > 1019: 10GBase-X Test Control 0x0000 > > 9000: 10GBase-X Control 0x0001 > > 9001: 10GBase-X Interrupt Enable 1 0x0000 > > 9002: 10GBase-X Interrupt Enable 2 0x0000 > > 9003: 10GBase-X Interrupt Status 1 0x0000 > > 9004: 10GBase-X Interrupt Status 2 0x00e1 > > 9006: 10GBase-X Real Time Status 0x0011 > > 9010: 10GBase-X Random Sequence Control 0x0000 > > 9011: 10GBase-X Jitter Packet Transmit Count 0x0000 > > 9012: 10GBase-X Jitter Packet Transmit Count 0x0000 > > 9013: 10GBase-X Jitter Packet Received Count 0x0000 > > 9014: 10GBase-X Jitter Packet Received Count 0x0000 > > 9015: 10GBase-X Jitter Packet Error Counter 0x0000 > > 9016: 10GBase-X Jitter Packet Error Counter 0x0000 > > 1020: 10GBASE-R PCS Status 1 0x0000 > > 1021: 10GBASE-R PCS Status 2 0x0000 > > 1022: 10GBASE-R PCS Test Pattern Seed A 0 0x0000 > > 1023: 10GBASE-R PCS Test Pattern Seed A 1 0x0000 > > 1024: 10GBASE-R PCS Test Pattern Seed A 2 0x0000 > > 1025: 10GBASE-R PCS Test Pattern Seed A 3 0x0000 > > 1026: 10GBASE-R PCS Test Pattern Seed B 0 0x0000 > > 1027: 10GBASE-R PCS Test Pattern Seed B 1 0x0000 > > 1028: 10GBASE-R PCS Test Pattern Seed B 2 0x0000 > > 1029: 10GBASE-R PCS Test Pattern Seed B 3 0x0000 > > 102a: 10GBASE-R PCS Test Pattern Control 0x0000 > > 102b: 10GBASE-R PCS Test Error Counter 0x0000 > > > > root@(none):~$ ethtool -S sff2 > > NIC statistics: > > tx_packets: 3 > > tx_bytes: 126 > > rx_packets: 0 > > rx_bytes: 0 > > in_good_octets: 0 > > in_bad_octets: 0 > > in_unicast: 0 > > in_broadcasts: 0 > > in_multicasts: 0 > > in_pause: 0 > > in_undersize: 0 > > in_fragments: 0 > > in_oversize: 0 > > in_jabber: 0 > > in_rx_error: 0 > > in_fcs_error: 0 > > out_octets: 192 > > out_unicast: 0 > > out_broadcasts: 3 > > out_multicasts: 0 > > out_pause: 0 > > excessive: 0 > > collisions: 0 > > deferred: 0 > > single: 0 > > multiple: 0 > > out_fcs_error: 0 > > late: 0 > > hist_64bytes: 3 > > hist_65_127bytes: 0 > > hist_128_255bytes: 0 > > hist_256_511bytes: 0 > > hist_512_1023bytes: 0 > > hist_1024_max_bytes: 0 > > in_discards: 0 > > in_filtered: 0 > > in_accepted: 0 > > in_bad_accepted: 0 > > in_good_avb_class_a: 0 > > in_good_avb_class_b: 0 > > in_bad_avb_class_a: 0 > > in_bad_avb_class_b: 0 > > tcam_counter_0: 0 > > tcam_counter_1: 0 > > tcam_counter_2: 0 > > tcam_counter_3: 0 > > in_da_unknown: 0 > > in_management: 0 > > out_queue_0: 3 > > out_queue_1: 0 > > out_queue_2: 0 > > out_queue_3: 0 > > out_queue_4: 0 > > out_queue_5: 0 > > out_queue_6: 0 > > out_queue_7: 0 > > out_cut_through: 0 > > out_octets_a: 0 > > out_octets_b: 0 > > out_management: 3 > > serdes_rx_pkts: 6 > > serdes_rx_bytes: 384 > > serdes_rx_pkts_error: 0 > > atu_member_violation: 0 > > atu_miss_violation: 0 > > atu_full_violation: 0 > > vtu_member_violation: 0 > > vtu_miss_violation: 0 >
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