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[Tim Gardner <tim.gardner@xxxxxxxxxxxxx>]

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: Incomplete

** Changed in: linux (Ubuntu Xenial)
       Status: Incomplete => In Progress

** Changed in: linux (Ubuntu Xenial)
     Assignee: (unassigned) => Tim Gardner (timg-tpi)

** Changed in: linux (Ubuntu Xenial)
       Status: In Progress => Fix Committed

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https://bugs.launchpad.net/bugs/1557950

Title:
  mlx5_core kernel trace after "ethtool -C eth1 adaptive-rx on" flow

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Xenial:
  Fix Committed

Bug description:
  reproduce steps:
  # ethtool -c eth1 
  Coalesce parameters for eth1: 
  Adaptive RX: off TX: off

  # ethtool -C eth1 adaptive-rx on


  
  # cat /etc/os-release
  NAME="Ubuntu"
  VERSION="16.04 (Xenial Xerus)"
  ID=ubuntu
  ID_LIKE=debian
  PRETTY_NAME="Ubuntu 16.04"
  VERSION_ID="16.04"
  HOME_URL="http://www.ubuntu.com/";
  SUPPORT_URL="http://help.ubuntu.com/";
  BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/";
  UBUNTU_CODENAME=xenial

  # uname -a
  Linux dev-h-vrt-006 4.4.0-11-generic #26-Ubuntu SMP Sat Mar 5 14:25:21 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

  
  #dmesg 
  [174430.803529] mst_pci: module verification failed: signature and/or required key missing - tainting kernel                                                                                         
  [174453.001485] BUG: unable to handle kernel NULL pointer dereference at           (null)                                                                                                            
  [174453.001509] IP: [<ffffffffc0152c7e>] mlx5e_set_coalesce+0x6e/0x100 [mlx5_core]                                                                                                                   
  [174453.001535] PGD 81a5c7067 PUD 81aa93067 PMD 0                                                                                                                                                    
  [174453.001556] Oops: 0000 [#1] SMP
  [174453.001571] Modules linked in: mst_pciconf(OE) mst_pci(OE) nfsv3 nfs_acl rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace fscache mlx5_ib ib_core ib_addr vfio_pci vfio_virqfd vfio_iommu_type1 vfio xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables bridge stp llc x86_pkg_temp_thermal intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul aesni_intel kvm_intel aes_x86_64 ipmi_ssif lrw gf128mul glue_helper ablk_helper cryptd serio_raw kvm sb_edac edac_core irqbypass hpilo ipmi_si 8250_fintek ioatdma ipmi_msghandler acpi_power_meter mac_hid lpc_ich shpchp sunrpc autofs4 mlx4_en
  [174453.001928]  psmouse ixgbe dca vxlan pata_acpi ip6_udp_tunnel udp_tunnel mdio hpsa mlx5_core tg3 scsi_transport_sas mlx4_core ptp pps_core wmi fjes
  [174453.002011] CPU: 2 PID: 40824 Comm: ethtool Tainted: G           OE   4.4.0-11-generic #26-Ubuntu
  [174453.002026] Hardware name: HP ProLiant DL380p Gen8, BIOS P70 12/20/2013
  [174453.002037] task: ffff8800bd919b80 ti: ffff880814d74000 task.ti: ffff880814d74000
  [174453.002072] RIP: 0010:[<ffffffffc0152c7e>]  [<ffffffffc0152c7e>] mlx5e_set_coalesce+0x6e/0x100 [mlx5_core]
  [174453.002119] RSP: 0018:ffff880814d77c30  EFLAGS: 00010246
  [174453.002141] RAX: 0000000000000000 RBX: ffff880816e00000 RCX: 0000000000000000
  [174453.002176] RDX: 0000000000000000 RSI: ffff880814d77c74 RDI: ffff880814e60000
  [174453.002210] RBP: ffff880814d77c60 R08: ffffffff81e42520 R09: ffffffffff000000
  [174453.002245] R10: 0000000000000533 R11: 0000000000000246 R12: ffff880814d77c74
  [174453.002280] R13: ffff880814e60000 R14: 0000000000000000 R15: ffff880814e60000
  [174453.002316] FS:  00007f7e927f7700(0000) GS:ffff88081f680000(0000) knlGS:0000000000000000
  [174453.002352] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [174453.002374] CR2: 0000000000000000 CR3: 0000000818365000 CR4: 00000000001406e0
  [174453.002409] Stack:
  [174453.002427]  0000000017a4b290 ffff880814e60000 0000000600114bb3 000000000000000f
  [174453.002476]  0000000000008946 ffff880814e60000 ffff880814d77ce0 ffffffff8171784a
  [174453.002525]  0000000f00000010 0000002000000010 0000000000000000 0000002000000010
  [174453.002574] Call Trace:
  [174453.002597]  [<ffffffff8171784a>] ethtool_set_coalesce+0x5a/0x80
  [174453.002621]  [<ffffffff81719928>] dev_ethtool+0xe78/0x1d70
  [174453.002645]  [<ffffffff8119a76b>] ? page_cache_async_readahead+0x6b/0x70
  [174453.002670]  [<ffffffff811c9505>] ? page_add_file_rmap+0x25/0x60
  [174453.002694]  [<ffffffff81727c95>] ? __rtnl_unlock+0x15/0x20
  [174453.002717]  [<ffffffff81717141>] ? netdev_run_todo+0x61/0x320
  [174453.002741]  [<ffffffff8172bf02>] dev_ioctl+0x182/0x580
  [174453.002765]  [<ffffffff816f3e12>] sock_do_ioctl+0x42/0x50
  [174453.002788]  [<ffffffff816f4312>] sock_ioctl+0x1d2/0x290
  [174453.002811]  [<ffffffff8121e3ef>] do_vfs_ioctl+0x29f/0x490
  [174453.003136]  [<ffffffff8106a554>] ? __do_page_fault+0x1b4/0x400
  [174453.003161]  [<ffffffff81228c35>] ? fd_install+0x25/0x30
  [174453.003183]  [<ffffffff8121e659>] SyS_ioctl+0x79/0x90
  [174453.003208]  [<ffffffff8181c832>] entry_SYSCALL_64_fastpath+0x16/0x71
  [174453.003231] Code: 66 89 87 36 66 00 00 8b 46 08 66 89 87 38 66 00 00 0f 84 91 00 00 00 49 89 fd 49 89 f4 48 63 45 d4 49 8b 95 00 13 00 00 45 31 f6 <4c> 8b 3c c2 41 80 bf dc 18 00 00 00 74 3d 49 63 c6 41 0f b7 4c
  [174453.003564] RIP  [<ffffffffc0152c7e>] mlx5e_set_coalesce+0x6e/0x100 [mlx5_core]
  [174453.003607]  RSP <ffff880814d77c30>
  [174453.003626] CR2: 0000000000000000
  [174453.004055] ---[ end trace 8466dfbb422a27d8 ]---

  
  Fix upstream commits
  7524a5d88b94afef8397a79f1e664af5b7052c22 net/mlx5e: Don't modify CQ before it was created
  2fcb92fbd04eef26dfe7e67839da6262d83d6b65 net/mlx5e: Don't try to modify CQ moderation if it is not supported

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