Message-ID: <e16d08bf-49f6-4c51-85fa-7c368d1887b4@ycharbi.fr>
Date: Sat, 4 May 2024 15:29:05 +0200
From: kernel.org-fo5k2w@...arbi.fr
To: jacob.e.keller@...el.com
Cc: anthony.l.nguyen@...el.com, intel-wired-lan@...ts.osuosl.org,
 jesse.brandeburg@...el.com, kernel.org-fo5k2w@...arbi.fr,
 netdev@...r.kernel.org
Subject: Re: Non-functional ixgbe driver between Intel X553 chipset and Cisco
 switch via kernel >=6.1 under Debian

Hi,

 > I haven't touched the ixgbe driver and hardware in many years, but I'll
try to see what I can do to help.

Thank you very much for your reply. I'll answer you point by point.
I upgraded the Qoton to Debian 13 (testing) with kernel 6.6.15 (amd64) 
to be even more up to date.
A quick test with Fedora 40 shows the same problem.


 > So everything works when connected back to back with the Connectx-3. Ok.

Yes, exactly. Everything works as expected with the Connectx-3.


 > To confirm, you use the same cable in both cases?

Yes, the same cable. I tested two different models:
- 1 Cisco SFP-H10GB-CU1M (1 mètre)
- 1 Cisco SFP-H10GB-CU3M (3 mètres)

I'm only using the SFP-H10GB-CU3M for the rest for convenience.


 > But on the switch, the link is reported up until we bring the interface
 > up in ixgbe, and then link drops and stays down indefinitely?

After initial start-up of the Qotom :
# Port 10Gbe LEDs are green (please note that the MAC address OID - 
20:7c:14 - is registered to Qotom, not Intel).
ip link show dev eno1
7: eno1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode 
DEFAULT group default qlen 1000
     link/ether 20:7c:14:xx:xx:xx brd ff:ff:ff:ff:ff:ff
     altname enp11s0f0

# Cisco (Green LEDs - port mounted)
show running-config | section interface TenGigabitEthernet1/0/1
interface TenGigabitEthernet1/0/1
  no cdp enable

show interface status | include Te1/0/1
Te1/0/1   --- Vers Qotom --- connected    trunk        full    10G 
SFP-10GBase-CX1

show ip interface brief | include Te1/0/1 | Status
Interface              IP-Address      OK? Method Status                
Protocol
Te1/0/1                unassigned      YES unset up                    up

The Cisco and Qotom ports are lit and flashing as if they were 
exchanging ARP or STP traffic. A mirror port on the Cisco's 10Gbe 
interface, however, shows no frame exchange. I connected a PC to port 
g1/0/13 with Wireshark for this test.

monitor session 1 source interface t1/0/1 both
monitor session 1 destination interface g1/0/13

Port switch-on test :
# Starting up the Qotom 10Gbe network interface
ip link set eno1 up
[ 1770.476075] pps pps5: new PPS source ptp5
[ 1770.480784] ixgbe 0000:0b:00.0: registered PHC device on eno1
[ 1770.575496] ixgbe 0000:0b:00.0 eno1: detected SFP+: 3

# The ports on both devices switch off immediately.
# There's no going back:
ip link set eno1 down
[ 1831.329797] ixgbe 0000:0b:00.0: removed PHC on eno1

# The ports are always off on both sides even when unloading the ixgbe 
core module and plugging/unplugging the Cisco SFP-H10GB-CU3M :
rmmod ixgbe
[ 1872.503663] ixgbe 0000:0d:00.1: complete
[ 1872.547628] ixgbe 0000:0d:00.0: complete
[ 1872.591645] ixgbe 0000:0b:00.1: complete
[ 1872.631725] ixgbe 0000:0b:00.0: complete

A reboot is the only way to restore this port switch-on state.
On startup, the Cisco switch displays the following logs (the date is 
not configured):
Sep 30 14:33:00: %LINK-3-UPDOWN: Interface TenGigabitEthernet1/0/1, 
changed state to up
Sep 30 14:33:01: %LINEPROTO-5-UPDOWN: Line protocol on Interface 
TenGigabitEthernet1/0/1, changed state to up


 > But if you use the out-of-tree ixgbe driver everything works. Hmm.

Yes, that's exactly it. The driver on the Intel site works perfectly.

 > I tried checking the out-of-tree versions to see if there were any
 > obvious fixes. I didn't find anything. The code between the in-kernel
 > and out-of-tree is so different that it is hard to track down. At first
 > I wondered if this might be a regression due to recent changes to
 > support new hardware, but it appears that v6.1 is from before a lot of
 > that work went in.

If it helps, vesalius' post of December 3, 2023 on one of the links in 
my original post 
(https://forum.proxmox.com/threads/intel-x553-sfp-ixgbe-no-go-on-pve8.135129/post-612291) 
reports that the following commit has been suspected as the culprit: 
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v6.1.63&id=565736048bd5f9888990569993c6b6bfdf6dcb6d

I quote the end of his message:
"An amazon employee states reverting this commit and recompiling the 
kernel allows their similar network hardware to use the current in-tree 
6.1 ixgbe driver. Otherwise as stated in the VyOS forum thread linked 
above compiling the linux kernel with the out-of-tree intel ixgbe driver 
5.19.6 works too."


 > 1. The kernel message logs from when you bring up the interface. You can
get this from dmesg or journalctl -k if you have systemd.

The kernel returns only the following three lines after a "ip link set 
eno1 up" :
mai 04 12:01:21 servyo kernel: pps pps5: new PPS source ptp5
mai 04 12:01:21 servyo kernel: ixgbe 0000:0b:00.0: registered PHC device 
on eno1
mai 04 12:01:21 servyo kernel: ixgbe 0000:0b:00.0 eno1: detected SFP+: 3

 > 2. "ethtool eno1" after you bring the interface up to see what it
reports about link

ethtool eno1
Settings for eno1:
     Supported ports: [ FIBRE ]
     Supported link modes:   10000baseT/Full
     Supported pause frame use: Symmetric
     Supports auto-negotiation: No
     Supported FEC modes: Not reported
     Advertised link modes:  10000baseT/Full
     Advertised pause frame use: Symmetric
     Advertised auto-negotiation: No
     Advertised FEC modes: Not reported
     Speed: Unknown!
     Duplex: Unknown! (255)
     Auto-negotiation: off
     Port: Direct Attach Copper
     PHYAD: 0
     Transceiver: internal
     Supports Wake-on: d
     Wake-on: d
         Current message level: 0x00000007 (7)
                                drv probe link
     Link detected: no


 > 3. "ethtool -S eno1" to see if any other stats are reported that might
help us isolate whats going on.

ethtool -S eno1
NIC statistics:
      rx_packets: 0
      tx_packets: 0
      rx_bytes: 0
      tx_bytes: 0
      rx_pkts_nic: 0
      tx_pkts_nic: 0
      rx_bytes_nic: 0
      tx_bytes_nic: 0
      lsc_int: 1
      tx_busy: 0
      non_eop_descs: 0
      rx_errors: 0
      tx_errors: 0
      rx_dropped: 0
      tx_dropped: 0
      multicast: 0
      broadcast: 0
      rx_no_buffer_count: 0
      collisions: 0
      rx_over_errors: 0
      rx_crc_errors: 0
      rx_frame_errors: 0
      hw_rsc_aggregated: 0
      hw_rsc_flushed: 0
      fdir_match: 0
      fdir_miss: 0
      fdir_overflow: 0
      rx_fifo_errors: 0
      rx_missed_errors: 0
      tx_aborted_errors: 0
      tx_carrier_errors: 0
      tx_fifo_errors: 0
      tx_heartbeat_errors: 0
      tx_timeout_count: 0
      tx_restart_queue: 0
      rx_length_errors: 0
      rx_long_length_errors: 0
      rx_short_length_errors: 0
      tx_flow_control_xon: 0
      rx_flow_control_xon: 0
      tx_flow_control_xoff: 0
      rx_flow_control_xoff: 0
      rx_csum_offload_errors: 0
      alloc_rx_page: 4088
      alloc_rx_page_failed: 0
      alloc_rx_buff_failed: 0
      rx_no_dma_resources: 0
      os2bmc_rx_by_bmc: 0
      os2bmc_tx_by_bmc: 0
      os2bmc_tx_by_host: 0
      os2bmc_rx_by_host: 0
      tx_hwtstamp_timeouts: 0
      tx_hwtstamp_skipped: 0
      rx_hwtstamp_cleared: 0
      tx_ipsec: 0
      rx_ipsec: 0
      fcoe_bad_fccrc: 0
      rx_fcoe_dropped: 0
      rx_fcoe_packets: 0
      rx_fcoe_dwords: 0
      fcoe_noddp: 0
      fcoe_noddp_ext_buff: 0
      tx_fcoe_packets: 0
      tx_fcoe_dwords: 0
      tx_queue_0_packets: 0
      tx_queue_0_bytes: 0
      tx_queue_1_packets: 0
      tx_queue_1_bytes: 0
      tx_queue_2_packets: 0
      tx_queue_2_bytes: 0
      tx_queue_3_packets: 0
      tx_queue_3_bytes: 0
      tx_queue_4_packets: 0
      tx_queue_4_bytes: 0
      tx_queue_5_packets: 0
      tx_queue_5_bytes: 0
      tx_queue_6_packets: 0
      tx_queue_6_bytes: 0
      tx_queue_7_packets: 0
      tx_queue_7_bytes: 0
      tx_queue_8_packets: 0
      tx_queue_8_bytes: 0
      tx_queue_9_packets: 0
      tx_queue_9_bytes: 0
      tx_queue_10_packets: 0
      tx_queue_10_bytes: 0
      tx_queue_11_packets: 0
      tx_queue_11_bytes: 0
      tx_queue_12_packets: 0
      tx_queue_12_bytes: 0
      tx_queue_13_packets: 0
      tx_queue_13_bytes: 0
      tx_queue_14_packets: 0
      tx_queue_14_bytes: 0
      tx_queue_15_packets: 0
      tx_queue_15_bytes: 0
      tx_queue_16_packets: 0
      tx_queue_16_bytes: 0
      tx_queue_17_packets: 0
      tx_queue_17_bytes: 0
      tx_queue_18_packets: 0
      tx_queue_18_bytes: 0
      tx_queue_19_packets: 0
      tx_queue_19_bytes: 0
      tx_queue_20_packets: 0
      tx_queue_20_bytes: 0
      tx_queue_21_packets: 0
      tx_queue_21_bytes: 0
      tx_queue_22_packets: 0
      tx_queue_22_bytes: 0
      tx_queue_23_packets: 0
      tx_queue_23_bytes: 0
      tx_queue_24_packets: 0
      tx_queue_24_bytes: 0
      tx_queue_25_packets: 0
      tx_queue_25_bytes: 0
      tx_queue_26_packets: 0
      tx_queue_26_bytes: 0
      tx_queue_27_packets: 0
      tx_queue_27_bytes: 0
      tx_queue_28_packets: 0
      tx_queue_28_bytes: 0
      tx_queue_29_packets: 0
      tx_queue_29_bytes: 0
      tx_queue_30_packets: 0
      tx_queue_30_bytes: 0
      tx_queue_31_packets: 0
      tx_queue_31_bytes: 0
      tx_queue_32_packets: 0
      tx_queue_32_bytes: 0
      tx_queue_33_packets: 0
      tx_queue_33_bytes: 0
      tx_queue_34_packets: 0
      tx_queue_34_bytes: 0
      tx_queue_35_packets: 0
      tx_queue_35_bytes: 0
      tx_queue_36_packets: 0
      tx_queue_36_bytes: 0
      tx_queue_37_packets: 0
      tx_queue_37_bytes: 0
      tx_queue_38_packets: 0
      tx_queue_38_bytes: 0
      tx_queue_39_packets: 0
      tx_queue_39_bytes: 0
      tx_queue_40_packets: 0
      tx_queue_40_bytes: 0
      tx_queue_41_packets: 0
      tx_queue_41_bytes: 0
      tx_queue_42_packets: 0
      tx_queue_42_bytes: 0
      tx_queue_43_packets: 0
      tx_queue_43_bytes: 0
      tx_queue_44_packets: 0
      tx_queue_44_bytes: 0
      tx_queue_45_packets: 0
      tx_queue_45_bytes: 0
      tx_queue_46_packets: 0
      tx_queue_46_bytes: 0
      tx_queue_47_packets: 0
      tx_queue_47_bytes: 0
      tx_queue_48_packets: 0
      tx_queue_48_bytes: 0
      tx_queue_49_packets: 0
      tx_queue_49_bytes: 0
      tx_queue_50_packets: 0
      tx_queue_50_bytes: 0
      tx_queue_51_packets: 0
      tx_queue_51_bytes: 0
      tx_queue_52_packets: 0
      tx_queue_52_bytes: 0
      tx_queue_53_packets: 0
      tx_queue_53_bytes: 0
      tx_queue_54_packets: 0
      tx_queue_54_bytes: 0
      tx_queue_55_packets: 0
      tx_queue_55_bytes: 0
      tx_queue_56_packets: 0
      tx_queue_56_bytes: 0
      tx_queue_57_packets: 0
      tx_queue_57_bytes: 0
      tx_queue_58_packets: 0
      tx_queue_58_bytes: 0
      tx_queue_59_packets: 0
      tx_queue_59_bytes: 0
      tx_queue_60_packets: 0
      tx_queue_60_bytes: 0
      tx_queue_61_packets: 0
      tx_queue_61_bytes: 0
      tx_queue_62_packets: 0
      tx_queue_62_bytes: 0
      tx_queue_63_packets: 0
      tx_queue_63_bytes: 0
      rx_queue_0_packets: 0
      rx_queue_0_bytes: 0
      rx_queue_1_packets: 0
      rx_queue_1_bytes: 0
      rx_queue_2_packets: 0
      rx_queue_2_bytes: 0
      rx_queue_3_packets: 0
      rx_queue_3_bytes: 0
      rx_queue_4_packets: 0
      rx_queue_4_bytes: 0
      rx_queue_5_packets: 0
      rx_queue_5_bytes: 0
      rx_queue_6_packets: 0
      rx_queue_6_bytes: 0
      rx_queue_7_packets: 0
      rx_queue_7_bytes: 0
      rx_queue_8_packets: 0
      rx_queue_8_bytes: 0
      rx_queue_9_packets: 0
      rx_queue_9_bytes: 0
      rx_queue_10_packets: 0
      rx_queue_10_bytes: 0
      rx_queue_11_packets: 0
      rx_queue_11_bytes: 0
      rx_queue_12_packets: 0
      rx_queue_12_bytes: 0
      rx_queue_13_packets: 0
      rx_queue_13_bytes: 0
      rx_queue_14_packets: 0
      rx_queue_14_bytes: 0
      rx_queue_15_packets: 0
      rx_queue_15_bytes: 0
      rx_queue_16_packets: 0
      rx_queue_16_bytes: 0
      rx_queue_17_packets: 0
      rx_queue_17_bytes: 0
      rx_queue_18_packets: 0
      rx_queue_18_bytes: 0
      rx_queue_19_packets: 0
      rx_queue_19_bytes: 0
      rx_queue_20_packets: 0
      rx_queue_20_bytes: 0
      rx_queue_21_packets: 0
      rx_queue_21_bytes: 0
      rx_queue_22_packets: 0
      rx_queue_22_bytes: 0
      rx_queue_23_packets: 0
      rx_queue_23_bytes: 0
      rx_queue_24_packets: 0
      rx_queue_24_bytes: 0
      rx_queue_25_packets: 0
      rx_queue_25_bytes: 0
      rx_queue_26_packets: 0
      rx_queue_26_bytes: 0
      rx_queue_27_packets: 0
      rx_queue_27_bytes: 0
      rx_queue_28_packets: 0
      rx_queue_28_bytes: 0
      rx_queue_29_packets: 0
      rx_queue_29_bytes: 0
      rx_queue_30_packets: 0
      rx_queue_30_bytes: 0
      rx_queue_31_packets: 0
      rx_queue_31_bytes: 0
      rx_queue_32_packets: 0
      rx_queue_32_bytes: 0
      rx_queue_33_packets: 0
      rx_queue_33_bytes: 0
      rx_queue_34_packets: 0
      rx_queue_34_bytes: 0
      rx_queue_35_packets: 0
      rx_queue_35_bytes: 0
      rx_queue_36_packets: 0
      rx_queue_36_bytes: 0
      rx_queue_37_packets: 0
      rx_queue_37_bytes: 0
      rx_queue_38_packets: 0
      rx_queue_38_bytes: 0
      rx_queue_39_packets: 0
      rx_queue_39_bytes: 0
      rx_queue_40_packets: 0
      rx_queue_40_bytes: 0
      rx_queue_41_packets: 0
      rx_queue_41_bytes: 0
      rx_queue_42_packets: 0
      rx_queue_42_bytes: 0
      rx_queue_43_packets: 0
      rx_queue_43_bytes: 0
      rx_queue_44_packets: 0
      rx_queue_44_bytes: 0
      rx_queue_45_packets: 0
      rx_queue_45_bytes: 0
      rx_queue_46_packets: 0
      rx_queue_46_bytes: 0
      rx_queue_47_packets: 0
      rx_queue_47_bytes: 0
      rx_queue_48_packets: 0
      rx_queue_48_bytes: 0
      rx_queue_49_packets: 0
      rx_queue_49_bytes: 0
      rx_queue_50_packets: 0
      rx_queue_50_bytes: 0
      rx_queue_51_packets: 0
      rx_queue_51_bytes: 0
      rx_queue_52_packets: 0
      rx_queue_52_bytes: 0
      rx_queue_53_packets: 0
      rx_queue_53_bytes: 0
      rx_queue_54_packets: 0
      rx_queue_54_bytes: 0
      rx_queue_55_packets: 0
      rx_queue_55_bytes: 0
      rx_queue_56_packets: 0
      rx_queue_56_bytes: 0
      rx_queue_57_packets: 0
      rx_queue_57_bytes: 0
      rx_queue_58_packets: 0
      rx_queue_58_bytes: 0
      rx_queue_59_packets: 0
      rx_queue_59_bytes: 0
      rx_queue_60_packets: 0
      rx_queue_60_bytes: 0
      rx_queue_61_packets: 0
      rx_queue_61_bytes: 0
      rx_queue_62_packets: 0
      rx_queue_62_bytes: 0
      rx_queue_63_packets: 0
      rx_queue_63_bytes: 0
      tx_pb_0_pxon: 0
      tx_pb_0_pxoff: 0
      tx_pb_1_pxon: 0
      tx_pb_1_pxoff: 0
      tx_pb_2_pxon: 0
      tx_pb_2_pxoff: 0
      tx_pb_3_pxon: 0
      tx_pb_3_pxoff: 0
      tx_pb_4_pxon: 0
      tx_pb_4_pxoff: 0
      tx_pb_5_pxon: 0
      tx_pb_5_pxoff: 0
      tx_pb_6_pxon: 0
      tx_pb_6_pxoff: 0
      tx_pb_7_pxon: 0
      tx_pb_7_pxoff: 0
      rx_pb_0_pxon: 0
      rx_pb_0_pxoff: 0
      rx_pb_1_pxon: 0
      rx_pb_1_pxoff: 0
      rx_pb_2_pxon: 0
      rx_pb_2_pxoff: 0
      rx_pb_3_pxon: 0
      rx_pb_3_pxoff: 0
      rx_pb_4_pxon: 0
      rx_pb_4_pxoff: 0
      rx_pb_5_pxon: 0
      rx_pb_5_pxoff: 0
      rx_pb_6_pxon: 0
      rx_pb_6_pxoff: 0
      rx_pb_7_pxon: 0
      rx_pb_7_pxoff: 0


 > Do you happen to know if any particular in-kernel driver version worked?
 > It would help limit the search for regressing commits.

I can't retrieve the driver version itself via a “modinfo ixgbe” (no 
field mentions it) but the driver built into Debian 11 kernel 
5.10.0-10-amd64 works perfectly. Debian 12's 6.1.76-amd64 and Debian 
13's 6.6.15-amd64 are problematic. If you have a method of retrieving 
more precise information, I'd be delighted to provide it.
The problem therefore “spread” between the release of Linux >5.10 and >=6.1.

On Linux 5.10.0-10, an ethtool returns this (the port works):
ethtool eno1
Settings for eno1:
     Supported ports: [ FIBRE ]
     Supported link modes:   10000baseT/Full
     Supported pause frame use: Symmetric
     Supports auto-negotiation: No
     Supported FEC modes: Not reported
     Advertised link modes:  10000baseT/Full
     Advertised pause frame use: Symmetric
     Advertised auto-negotiation: No
     Advertised FEC modes: Not reported
     Speed: 10000Mb/s
     Duplex: Full
     Auto-negotiation: off
     Port: Direct Attach Copper
     PHYAD: 0
     Transceiver: internal
     Supports Wake-on: d
     Wake-on: d
         Current message level: 0x00000007 (7)
                                drv probe link
     Link detected: yes


 > Ideally, if you could use git bisect on the setup that could
 > efficiently locate what regressed the behavior.

I really want to, but I have no idea how to go about it. Can you write 
me the command lines to satisfy your request?


Best regards.

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