linux-kernel - Re: [PATCH] IB/IPoIB: Replace netdev_priv with ipoib_priv for ipoib_get_link

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Date:   Fri, 19 May 2017 11:15:32 +0800
From:   Yanjun Zhu <yanjun.zhu@...cle.com>
To:     Leon Romanovsky <leon@...nel.org>,
        Yuval Shaia <yuval.shaia@...cle.com>
Cc:     Honggang LI <honli@...hat.com>, dledford@...hat.com,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] IB/IPoIB: Replace netdev_priv with ipoib_priv for
 ipoib_get_link_ksettings



On 2017/5/11 20:40, Leon Romanovsky wrote:
> On Thu, May 11, 2017 at 03:31:10PM +0300, Yuval Shaia wrote:
>> On Thu, May 11, 2017 at 08:14:28PM +0800, Honggang LI wrote:
>>> From: Honggang Li <honli@...hat.com>
>>>
>>> ipoib_dev_init accesses the private data for IPoIB net_device with
>>> ipoib_priv. ipoib_get_link_ksettings should do as ipoib_dev_init.
>>> Otherwise kernel panic.
>>>
>>> [   27.271938] IPv6: ADDRCONF(NETDEV_CHANGE): mlx5_ib0.8006: link becomes ready
>>> [   28.156790] BUG: unable to handle kernel NULL pointer dereference at 000000000000067c
>>> [   28.166309] IP: ib_query_port+0x30/0x180 [ib_core]
>>> [   28.172364] PGD 0
>>> [   28.172364] P4D 0
>>> [   28.175307]
>>> [   28.180595] Oops: 0000 [#1] SMP
>>> [   28.184802] Modules linked in: bridge 8021q garp mrp stp llc rpcrdma ib_isert iscsi_target_mod ib_iser libiscsi scsi_transport_iscsi ib_srpt target_core_mod ib_srp scsi_transport_srp ib_ipoib rdma_ucm ib_ucm ib_uverbs ib_umad rdma_cm ib_cm iw_cm mlx5_ib ib_core intel_rapl sb_edac x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel ipmi_ssif crypto_simd glue_helper cryptd iTCO_wdt ipmi_si iTCO_vendor_support wmi pcspkr ipmi_devintf dcdbas ipmi_msghandler lpc_ich sg mei_me mei shpchp acpi_power_meter nfsd auth_rpcgss nfs_acl lockd grace sunrpc binfmt_misc ip_tables xfs libcrc32c sd_mod mgag200 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm mlx5_core drm tg3 devlink ahci libahci ptp libata
>>> [   28.270227]  crc32c_intel i2c_core pps_core dm_mirror dm_region_hash dm_log dm_mod
>>> [   28.279674] CPU: 0 PID: 1766 Comm: libvirtd Not tainted 4.11.0.56868a4.20170510+ #1
>>> [   28.289242] Hardware name: Dell Inc. PowerEdge R430/03XKDV, BIOS 1.6.2 01/08/2016
>>> [   28.298628] task: ffff8b4777311680 task.stack: ffffb9ab0f7ac000
>>> [   28.306282] RIP: 0010:ib_query_port+0x30/0x180 [ib_core]
>>> [   28.313249] RSP: 0018:ffffb9ab0f7afbb0 EFLAGS: 00010246
>>> [   28.320128] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
>>> [   28.329169] RDX: ffffb9ab0f7afc00 RSI: 0000000000000000 RDI: 0000000000000000
>>> [   28.338202] RBP: ffffb9ab0f7afbf0 R08: 0000000000000000 R09: 0000000000000000
>>> [   28.347246] R10: 0000000000001000 R11: 0000000000000000 R12: 0000000000000000
>>> [   28.356284] R13: ffffb9ab0f7afc00 R14: ffffb9ab0f7afef0 R15: ffff8b377eae9b80
>>> [   28.365316] FS:  00007f9aed612700(0000) GS:ffff8b377f800000(0000) knlGS:0000000000000000
>>> [   28.375431] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>> [   28.383724] CR2: 000000000000067c CR3: 000000202aa7c000 CR4: 00000000001406f0
>>> [   28.393337] Call Trace:
>>> [   28.397594]  ipoib_get_link_ksettings+0x66/0xe0 [ib_ipoib]
>>> [   28.405274]  __ethtool_get_link_ksettings+0xa0/0x1c0
>>> [   28.412353]  speed_show+0x74/0xa0
>>> [   28.417503]  dev_attr_show+0x20/0x50
>>> [   28.422922]  ? mutex_lock+0x12/0x40
>>> [   28.428179]  sysfs_kf_seq_show+0xbf/0x1a0
>>> [   28.434002]  kernfs_seq_show+0x21/0x30
>>> [   28.439470]  seq_read+0x116/0x3b0
>>> [   28.444445]  ? do_filp_open+0xa5/0x100
>>> [   28.449774]  kernfs_fop_read+0xff/0x180
>>> [   28.455220]  __vfs_read+0x37/0x150
>>> [   28.460167]  ? security_file_permission+0x9d/0xc0
>>> [   28.466560]  vfs_read+0x8c/0x130
>>> [   28.471318]  SyS_read+0x55/0xc0
>>> [   28.475950]  do_syscall_64+0x67/0x150
>>> [   28.481163]  entry_SYSCALL64_slow_path+0x25/0x25
>>> [   28.487425] RIP: 0033:0x7f9b1bf4a70d
>>> [   28.492522] RSP: 002b:00007f9aed611a40 EFLAGS: 00000293 ORIG_RAX: 0000000000000000
>>> [   28.502097] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9b1bf4a70d
>>> [   28.511178] RDX: 0000000000000401 RSI: 00007f9ae8183650 RDI: 0000000000000017
>>> [   28.520261] RBP: 0000000000000401 R08: 0000000000000080 R09: 0000000000002001
>>> [   28.529322] R10: 000000000000006b R11: 0000000000000293 R12: 00007f9ae8183650
>>> [   28.538368] R13: 0000000000000000 R14: 0000000000000017 R15: 0000000000002001
>>> [   28.547432] Code: 55 48 89 e5 41 55 49 89 d5 41 54 44 0f b6 e6 53 48 89 fb 48 83 e4 f0 48 83 ec 20 65 48 8b 04 25 28 00 00 00 48 89 44 24 18 31 c0 <f6> 87 7c 06 00 00 01 75 2d 45 85 e4 0f 85 ca 00 00 00 b8 ea ff
>>> [   28.570861] RIP: ib_query_port+0x30/0x180 [ib_core] RSP: ffffb9ab0f7afbb0
>>> [   28.579601] CR2: 000000000000067c
>>> [   28.584493] ---[ end trace 3549968a4bf0aa5d ]---
>>>
>>> Fixes:  0d7e2d2166f6 ('IB/ipoib: add get_link_ksettings in ethtool')
>>>
>>> Signed-off-by: Honggang Li <honli@...hat.com>
>>> ---
>>>   drivers/infiniband/ulp/ipoib/ipoib_ethtool.c | 2 +-
>>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ethtool.c b/drivers/infiniband/ulp/ipoib/ipoib_ethtool.c
>>> index 874b243..7871379 100644
>>> --- a/drivers/infiniband/ulp/ipoib/ipoib_ethtool.c
>>> +++ b/drivers/infiniband/ulp/ipoib/ipoib_ethtool.c
>>> @@ -178,7 +178,7 @@ static inline int ib_speed_enum_to_int(int speed)
>>>   static int ipoib_get_link_ksettings(struct net_device *netdev,
>>>   				    struct ethtool_link_ksettings *cmd)
>>>   {
>>> -	struct ipoib_dev_priv *priv = netdev_priv(netdev);
>>> +	struct ipoib_dev_priv *priv = ipoib_priv(netdev);
>>>   	struct ib_port_attr attr;
>>>   	int ret, speed, width;
>>>
>> Suggesting to remove kernel oops from commit log message, fix is trivial.
> Please don't, they are useful.
Can we explain this in commit log message?

The patch "IB/IPoIB: Support acceleration options callbacks" makes 
ipoib_pirv different from netdev_priv.

Zhu Yanjun
>
>> Reviewed-by: Yuval Shaia <yuval.shaia@...cle.com>
>>
> Thanks,
> Reviewed-by: Leon Romanovsky <leonro@...lanox.com>